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Relevant bibliographies by topics / Heats of adsorption

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Academic literature on the topic 'Heats of adsorption'

Author: Grafiati

Published: 4 June 2021

Last updated: 18 June 2025

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Journal articles on the topic "Heats of adsorption"

1

S., A. Anjorin. "Determination of Adsorption Heats of Some Adsorbents on Ammonia." European Journal of Advances in Engineering and Technology 5, no. 12 (2018): 933–38. https://doi.org/10.5281/zenodo.10727512.

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<strong>ABSTRACT</strong> Adsorption is accompanied by the evolution of heat.  In this paper, adsorption isotherms were measured, at the pressure range of 6.67-53.33 kPa and at the temperature range of 303-353 K, for some adsorption working pairs: Charcoal –NH<sub>3</sub>, CaCl<sub>2 </sub>– NH<sub>3 </sub>and CaCl<sub>2 </sub>composites – NH<sub>3</sub>. Isosteric heats of adsorption were determined from these isotherms.  Values of isosteric heat of adsorption ranged between 13.94 and 50.71 kJ/mol for Charcoal, Charcoal + calcium chloride and calcium chloride + silica gel. 75% CaCl<sub>2 </sub>+ 25% CaSO<sub>4 </sub>had the least value of isosteric heat of adsorption whilst 75% CaCl<sub>2 </sub>+  25% charcoal had the highest value.

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Goncharuk, V. V., V. F. Gorchev, and S. A. Karakhim. "A New Approach for Modelling Heterogeneous Surfaces." Adsorption Science & Technology 14, no. 6 (1996): 375–82. http://dx.doi.org/10.1177/026361749601400605.

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In present work, the scope of a new approach for modelling heterogeneous surface isotherms and differential adsorption heats for a discrete heterogeneous surface with three kinds of sites has been examined. All the various kinds of experimentally observed dependencies of the differential adsorption heats on the surface coverage described in the literature have been reproduced. The increase in differential adsorption heat with surface coverage of a heterogeneous surface has been shown to be possible when the pre-exponential factor changes in moving from one kind of site to another. In this connection, it has been proposed that the heterogeneous surface should be characterized not only by the dependence of the adsorption heats on the distribution of active sites but also by the adsorption coefficient. The parameters for the adsorption of propan-2-ol on γ-aluminium oxide have been calculated from adsorption/calorimetric data.

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3

Giraldo, Liliana, Paola Rodriguez-Estupiñán, and Juan Carlos Moreno-Piraján. "Isosteric Heat: Comparative Study between Clausius–Clapeyron, CSK and Adsorption Calorimetry Methods." Processes 7, no. 4 (2019): 203. http://dx.doi.org/10.3390/pr7040203.

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This work presents the calorimetric study of five adsorbents with different chemical and textural characteristics: MOF-199, MCM-41, SBA-15, activated carbon prepared from corn cob (GACKP) and graphite. These solids were used to establish the differences between isosteric heats evaluated by three different methods: Clausius–Clapeyron (C-C), Chakraborty, Saha and Koyama (CSK) and Adsorption Calorimetry (A-Cal). The textural characterization results show solids that have values of specific surface area between 2271 m2·g−1 for the MOF-199 and 5.2 m2·g−1 for the graphite. According to the results obtained for the isosteric heats for each sample, the magnitude varies depending on the coverage of the adsorbate and the textural characteristics of each adsorbent. Solids with an organized structure have isosteric heat values that are coincident among the three methods. Meanwhile, heterogeneous solids such as activated carbon values evaluated by the CKS and C-C have a high dispersion method regarding the adsorption calorimetry method. The results obtained show that the adsorption calorimetry, being a direct experimental measurement method, presents less dispersed data. At low quantities, the isosteric heat of nitrogen adsorption decreased in the order MOF-199, GACKP, MCM-41, SBA-15 and Graphite. The order for the isosteric heats values was coherent with the surface characteristics of each of the solids, especially with the pore size distribution. Finally, throughout the coverage examined in this work, the isosteric heats for nitrogen adsorption determined by adsorption calorimetry (A-Cal) were larger than the evaluated by C-C and CSK indirect methods of vaporization. According to the results, it is shown that the adsorption calorimetry allows values of the isosteric heats of adsorption with an error of less than 2% to be established and also reveals the complex nature of the heterogeneity or homogeneity of the adsorbent.

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Liu, Xiuying, Jie He, and Rui Li. "High-Pressure Hydrogen Adsorption in the Zeolites: A Grand Canonical Monte Carlo Study." ISRN Renewable Energy 2012 (July 8, 2012): 1–4. http://dx.doi.org/10.5402/2012/491396.

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The adsorption of hydrogen molecules on different zeolites at near room temperature and extremely high pressures has been simulated employing Grand Canonical Monte Carlo (GCMC) method. Some important physical amounts under different temperatures and pressures, such as adsorption isotherms, adsorption amounts, and isosteric heats were studied. We predict the storage capacity of hydrogen in ZON and CHA zeolites at different conditions. The results show that the hydrogen storage capacity of CHA is superior to that of ZON. The different hydrogen adsorption behavior between them is explained by the isosteric heats of adsorption at different temperatures. These results may help us to understand different hydrogen adsorption properties of these two zeolites, thus facilitate exploring new hydrogen storage candidates experimentally.

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Zhou, Su-Qin, Yang-Yang Wu, Si-Yu Xu, Feng-Qi Zhao, and Xue-Hai Ju. "Oxygen adsorption and diffusion on an Al(111) surface and subsurface: a theoretical study." Canadian Journal of Chemistry 94, no. 6 (2016): 541–46. http://dx.doi.org/10.1139/cjc-2015-0278.

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The generalized gradient approximation of the density functional theory was used to investigate the adsorption and dissociation of the O2 molecule on an Al(111) surface and the subsequent diffusion of an oxygen atom into the subsurface with different oxygen coverages. The total adsorption energies of oxygen atoms on the Al(111) surface increase as the number of adsorbed oxygen atoms increases, while the adsorption heats per oxygen atom decrease firstly and then increase. The adsorption heats for O2 physisorption on the Al(111) surface would increase as the oxidization degree of Al(111) surface increased. As the oxidization degree of Al(111) surface increases, the adsorption heats for O2 chemisorption decrease firstly and then increase, and the O2 molecule would not dissociate when the oxidization degree was up to 1.0 monolayer. In general, the energy barriers for both the interlayer and intralayer diffusions of the oxygen atom on the Al(111) surface would become larger as the number of initial adsorbed oxygen atoms on the Al(111) surface increased due to an increasing repulsion force.

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Möller, P., and H. Papp. "Heats of Adsorption and Reaction of CO on Iron/Manganese Oxide Catalysts." Adsorption Science & Technology 4, no. 3 (1987): 176–84. http://dx.doi.org/10.1177/026361748700400303.

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The heats of adsorption and reaction of CO have been measured on reduced Fe/Mn oxide catalysts of different compositions at temperatures between 263 and 543 K. The heats of adsorption depend only to a small extent on the manganese content of the catalyst and are independent of the temperature of reduction. The former fact points to a more structural than electronic effect of the manganese oxide addition. The heats of adsorption are, however, strongly dependent on measurement temperature, increasing from about 60 kJ mol-1 at 263 K to about 200 kJ mol-1 at 493 K and then decreasing again to about 180 kJ mol-1 at 543 K. This temperature dependence can be explained by consecutive reactions following CO adsorption, i.e. the Boudouard reaction, dissociation of CO and diffusion of carbon into the bulk of iron. The amount of CO adsorbed is correlated to the metallic iron content in the surfaces of the catalysts.

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Rossi, Pier Francesco, та Paola Rossi. "Heats of Adsorption of Aliphatic Alcohols on α-Al2O3 at 25–200°C. I. Variations with Experimental Temperature". Adsorption Science & Technology 13, № 4 (1996): 215–29. http://dx.doi.org/10.1177/026361749601300401.

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The process of adsorption of five aliphatic alcohols (C1–C5) on α-Al2O3 in the temperature range 25–200°C has been studied by means of a Calvet microcalorimeter (moderately high temperature) equipped with a volumetric ramp. The calorimetric and volumetric isotherms indicate that the integral heats released and the amounts of alcohols adsorbed decreased as the experimental temperature increased. All the volumetric isotherms follow the Langmuir isotherm trend, i.e. type I isotherms. The differential heats of the five alcohols on α-alumina were very high (>250 kJ/mol) at very low coverages at all temperatures and decreased rapidly towards the heat of vaporization of the alcohols at higher coverages. The trends in the differential heats of adsorption as a function of the number of μmol of MeOH, EtOH, and 1-PrOH adsorbed appear to be different from those for 1-BuOH and 1-PeOH (1-pentanol) at the different temperatures studied. Increasing the adsorption temperature made the trends in the differential heats more pronounced, with the alumina surface requiring smaller amounts of adsorbed alcohol to effect its saturation.

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Kuznetsov, B. V., Ninh Anh Tuan, and T. A. Rachmanova. "Calorimetric and Isosteric Heats of Adsorption of Substances with Molecules of Different Electronic Structure." Adsorption Science & Technology 6, no. 1 (1989): 27–34. http://dx.doi.org/10.1177/026361748900600104.

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Calorimetric heats of adsorption have been measured for iso- and cyclo-pentane on NaX(86) zeolite at 140°C and for acetonitrile on carbon black and silica gel at 150°C. These heats have been compared with the corresponding isosteric values, calculated from isotherms measured over temperature ranges whose average values correspond to the above temperatures. The isosteric heats of adsorption coincide well with the calorimetric values in those cases where no change occurs in the mechanism for adsorbate–adsorbent interaction within the temperature range over which the isotherms have been measured. If this condition is not observed, the difference between the two sets of values can be quite considerable.

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Al-Zaid, Khairya, Saed Akashah, Fathi Owaysi, G. V. Jeffreys, Yu A. Eltekov, and C. Mumford. "Adsorption of Aromatic Compounds from Solutions on Molecular Sieve 13X." Adsorption Science & Technology 4, no. 3 (1987): 196–210. http://dx.doi.org/10.1177/026361748700400305.

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Measurements of the equilibrium extent of adsorption of individual aromatic hydrocarbons: mono, di, trinuclear aromatic and heterocyclo compounds from iso-octane solutions by molecular sieves 13X were carried out at 303 and 343 K and at concentrations up to 5 wt.% The limiting values of adsorption were essentially determined by using modified Brunauer-Emmett-Teller equation (BET). The coverages and numbers of adsorbate molecules occupied in the unit cell of the molecular sieves were calculated at different temperatures. The isosteric heats of adsorption of aromatic hydrocarbons were also determined using Clausius-Clapeyron equation. It was found that the heats of adsorption of aromatic compounds varied from 4 to 60 kJ mol-1

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Rakhmatkarieva, Firuza, Odina Davlatova, Mirzokhid Kokhkharov, et al. "Mechanism of H₂O Vapor Adsorption in A Type Zeolites: A Model Based on Adsorption Calorimetry." E3S Web of Conferences 434 (2023): 03032. http://dx.doi.org/10.1051/e3sconf/202343403032.

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In this study, the energy characteristics of water vapor adsorption in NaA and NaA(NaBO2) zeolites were measured by adsorption calorimetry. Information of differential heats, isotherms, entropy and kinetic of adsorption in the matrix of NaA and NaA(NaBO2) zeolites were obtained. Adsorption isotherms (a) and differential heats of adsorption (Qd) of water vapor by NaA and NaA(NaBO2) zeolites were measured at 303 K. The heats of adsorption are stepwise and each step corresponds to the stoichiometric formation of adsorption complexes of H2O molecules with Na+ or H+ ions, (H2O)n/Na+ or H+, (n = 1-4), which are located on the SIII, SII and SI crystallographic positions of NaA and NaA(NaBO2). Hydration mechanism of NaA and NaA(NaBO2) are complex and at saturation, the zeolites are occupied by the next water zeolitic host/guest systems: NaA – 2.2[(H2O)4/Na+III+H+], 3[(H2O)2/Na+II] and 6.6[(H2O)2/Na+I]; NaA(NaBO2) - 2[(H2O)4/Na+III], 3[(H2O)4/Na+II] and 6.86[(H2O)/Na+I]. The complete hydration of the α- and β cages of NaA amounts thus to 21,8 and 6,2 respectively H2O/u.c. and α-cage of NaA(NaBO2) – 26,3 H2O/u.c. The mean molar integral adsorption entropy of water is ~-30,5 J/mol K less than the entropy of the bulk liquid. This value nearly the same as entropy of crystalline water so the mobility of water in the zeolitic matrix is solidlike.

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Dissertations / Theses on the topic "Heats of adsorption"

1

Weaver, R. C. "A fibre-optic microcalorimeter for studying interactions of gases with thin film sensor materials." Thesis, University of Kent, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233913.

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Lione, Richard. "The study of heats of adsorption of gases of thin organic films using a novel interferometric micro-calorimeter." Thesis, University of Kent, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358168.

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Starr, David E. "Microcalorimetric heats of adsorption, surface residence times and sticking probabilities of metals on metal-oxide, and silicon substrates /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/8492.

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Darga, Alexander. "Sorption isotherms of volatile molecules on micro- and mesoporous nanosized siliceous materials based on acoustic wave devices : Determination of corresponding isosteric heats of adsorption." kostenfrei, 2008. http://edoc.ub.uni-muenchen.de/9093/.

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5

Cairns, Amy J. "Structural Diversity in Crystal Chemistry: Rational Design Strategies Toward the Synthesis of Functional Metal-Organic Materials." Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3455.

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Metal-Organic Materials (MOMs) represent an important class of solid-state crystalline materials. Their countless attractive attributes make them uniquely suited to potentially resolve many present and future utilitarian societal challenges ranging from energy and the environment, all the way to include biology and medicine. Since the birth of coordination chemistry, the self-assembly of organic molecules with metal ions has produced a plethora of simple and complex architectures, many of which possess diverse pore and channel systems in a periodic array. In its infancy however this field was primarily fueled by burgeoning serendipitous discoveries, with no regard to a rational design approach to synthesis. In the late 1980s, the field was transformed when the potential for design was introduced through the seminal studies conducted by Hoskins and Robson who transcended the pivotal works of Wells into the experimental regime. The construction of MOMs using metal-ligand directed assembly is often regarded as the origin of the molecular building block (MBB) approach, a rational design strategy that focuses on the self-assembly of pre-designed MBBs having desired shapes and geometries to generate structures with intended topologies by exploiting the diverse coordination modes and geometries afforded by metal ions and organic molecules. The evolution of the MBB approach has witnessed tremendous breakthroughs in terms of scale and porosity by simply replacing single metal ions with more rigid inorganic metal clusters whilst preserving the inherent modularity and essential geometrical attributes needed to construct target networks for desired applications. The work presented in this dissertation focuses upon the rational design and synthesis of a diverse collection of open frameworks constructed from pre-fabricated rigid inorganic MBBs (i.e. [M(CO2)4], [M2(RCO2)4], [M3O(RCO2)6], MN3O3, etc), supermolecular building blocks (SBBs) and 3-, 4- and 6-connected organic MBBs. A systematic evaluation concerning the effect of various structural parameters (i.e. pore size and shape, metal ion, charge, etc) on hydrogen uptake and the relative binding affinity of H2-MOF interactions for selected systems is provided.

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Robbins, Thomas. "Small-scale heat-driven adsorption cooling." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52982.

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Heat driven adsorption cycles use heat sources ranging in temperature from 80 - 150 °C to provide cooling, and have been used in both air conditioning and refrigeration applications. Adsorbent heat pumps operate with low cost, simple components, and very little vibration, making them appealing as an alternative heat pump technology. However, they have been limited thus far to commercial and industrial scale applications. To date, adsorption systems have predominantly used natural or industrial waste streams as heat sources in the 10s of kW range. This work expands the scope of adsorption applications to include heat driven cooling at small capacities (watts) and mobile cooling without electronic controls. Autonomous heat driven adsorption system controls are proposed and tested for these systems. Component and system level models are developed for design and assessment. Major trends in system performance with scale are identified and the causes for these scaling effects are presented. New adsorbent bed designs are proposed and modeled for small-scale adsorption systems. The small-scale adsorbent bed designs are fabricated and tested. Models are validated and refined based on the experimental results. Through a combination of modeling and experimental results, this work demonstrates the feasibility of adsorption system application at capacities that two orders of magnitude lower than any previously demonstrated work.

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Metcalf, Steven John. "Compact, efficient carbon-ammonia adsorption heat pump." Thesis, University of Warwick, 2009. http://wrap.warwick.ac.uk/2777/.

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The modelling, design, construction and experimental testing of a carbon-ammonia adsorption heat pump is presented. The main objective of the research was to design, manufacture and test an adsorption generator with low thermal mass and high power density. The adsorption generator developed was a stainless steel, nickel brazed plate heat exchanger. Computational modelling of the generator with thermal wave and multiplebed cycles revealed that multiple-bed cycles give a superior trade-off between efficiency and power density. Further modelling was carried out to evaluate the performance of the adsorption generator in a four-bed gas-fired domestic heat pump system. The proposed system is air-source and could deliver a nominal heating power of 7 kW and a seasonal heating COP of 1.35, equivalent to a one third reduction in gas consumption in comparison to a condensing boiler. The systems performance was compared to a vapour compression heat pump on running costs and CO2 emissions and was found to be similar or better in all cases. The adsorption generator was tested in a two-bed air-source heat pump system and achieved heating powers from 7 to 11 kW and a heating COP of between 1.4 and 1.6. Specific heating power ranged from 3.9 kW kg-1 to 6.1 kW kg-1, equivalent to specific cooling powers of between 1.1 kW kg-1 and 2 kW kg-1, which is a significant increase in power density compared to the state of the art.

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Rivero, Pacho Ángeles María. "Thermodynamic and heat transfer analysis of a carbon-ammonia adsorption heat pump." Thesis, University of Warwick, 2014. http://wrap.warwick.ac.uk/66341/.

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The modelling, design, construction and experimental testing of a carbon-ammonia adsorption heat pump is presented. The main objective of the research was to computer simulate and test a 4-beds thermal wave adsorption cycle and to improve the heat transfer rate in an existing shell and tube generator. The existing generators were shell and tube type and were made of nickel brazed stainless steel but their heat transfer performance was poor. New heat exchangers with same design but larger in size were manufactured. The sorbent material, active carbon, was tested in order to characterise its thermal properties and a new generator filling technique was developed and presented. Computational modelling was carried out to evaluate the performance of the 4-beds thermal wave adsorption cycle. The proposed system was an air source heat pump that could deliver an output heating power of 7 kW and a seasonal heating COP of 1.47. The adsorption generators were tested in a 4-bed thermal wave air-source heat pump system and achieved heating output powers between 4.5 to 5.20 kW if taking into account the system heat losses (4.30 to 4.90 kW without heat losses) and heating COP’s of between 1.26 and 1.31 if taking into account the system heat losses (1.13 to 1.18 kW without heat losses). These values were significantly lower than the predicted performance of the simulation. The main cause of this discrepancy was the water distributors located at the end of the generators that distorted during the testing stage and blocked the tubes of the generators.

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Schawe, Dirk. "Theoretical and experimental investigations of an adsorption heat pump with heat transfer between two adsorbers." [S.l. : s.n.], 2001. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB8962132.

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Fuller, Timothy Alan. "An analytical study of the performance characteristics of solid/vapor adsorption heat pumps." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/16961.

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Books on the topic "Heats of adsorption"

1

Boman, Daniel B., Alexander W. Raymond, and Srinivas Garimella. Adsorption Heat Pumps. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-72180-0.

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Ng, Kim Choon, and Bidyut Baran Saha. Advances in adsorption technology. Edited by Saha Bidyut Baran and Ng Kim Choon. Nova Science Publishers, 2009.

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Freni, Angelo, Belal Dawoud, Lucio Bonaccorsi, et al. Characterization of Zeolite-Based Coatings for Adsorption Heat Pumps. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-09327-7.

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Sapienza, Alessio, Andrea Frazzica, Angelo Freni, and Yuri Aristov. Dynamics of Adsorptive Systems for Heat Transformation. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-51287-7.

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Jet Propulsion Laboratory (U.S.), ed. Gas adsorption/absorption heat switch: Final report of phase 1. The Laboratory, 1987.

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Dombrovsky, L. A. Thermal radiation in disperse systems: An engineering approach. Begell House, 2010.

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Shilyaev, Mihail, Elena Hromova, Aleksandr Bogomolov, A. Pavlenko, and V. Butov. Modeling of hydrodynamics and heat and mass transfer in dispersed media. INFRA-M Academic Publishing LLC., 2022. http://dx.doi.org/10.12737/1865376.

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The monograph presents methods for calculating the dehydration of wet granular materials in industrial centrifuges, filter presses and vacuum filters under the influence of gravitational forces, as well as by purging the granular layer with dry air with elevated temperature; physical and mathematical models of gas absorption and the theory of capturing submicron dust by condensation in foam, centrifugal bubbling apparatus and hollow nozzle scrubbers, packing columns and tubular absorbers; physical and mathematical models of dry adsorption of gases in packing columns and flues by injecting a dispersed adsorbent into the flow are presented, a method for determining the phase equilibrium constants of sorption processes based on the developed models is proposed; physical and mathematical modeling and analysis of the combustion process of dispersed solid ash fuel in a four-stage cyclone gorenje is carried out. the furnace. It can be useful in the educational process for a number of specialties, in particular thermal power engineering, chemical-technological, metallurgical profiles, environmentalists, as well as for researchers and graduate students and in engineering practice.

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Turner, Lynne. Improvement of activated charcoal-ammonia adsorption heat pumping/refrigeration cycles: Investigation of porosity andheat/mass transfer chacteristics. typescript, 1992.

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Davies, Gareth N. L. Heat driven adsorption cooling utilising enhanced effective thermal conductivity monolithic adsorbent generators for refrigeration and ice production in developing countries. typescript, 2000.

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Boman, Daniel B., Alexander W. Raymond, and Srinivas Garimella. Adsorption Heat Pumps: Fundamentals and Applications. Springer International Publishing AG, 2021.

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Book chapters on the topic "Heats of adsorption"

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Yates, John T. "Calorimetric Heats of Adsorption—Single Crystals." In Experimental Innovations in Surface Science. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-17668-0_31.

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Vuong, T., and P. A. Monson. "Heats of Adsorption from Molecular Models of Adsorption in Heterogeneous Solids." In The Kluwer International Series in Engineering and Computer Science. Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-1375-5_126.

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Dunne, J., R. Mariwala, M. Rao, S. Sircar, R. J. Gorte, and A. L. Myers. "Heats of Adsorption of Polar and Non-Polar Gases in Homogeneous and Heterogeneous Adsorbents." In The Kluwer International Series in Engineering and Computer Science. Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-1375-5_33.

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Freni, Angelo, Belal Dawoud, Lucio Bonaccorsi, et al. "Adsorption Heat Exchangers." In Characterization of Zeolite-Based Coatings for Adsorption Heat Pumps. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-09327-7_2.

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Boman, Daniel B., Alexander W. Raymond, and Srinivas Garimella. "Adsorption Heat Pump Cycles." In Mechanical Engineering Series. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-72180-0_2.

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Ülkü, S. "Solar Adsorption Heat Pumps." In Solar Energy Utilization. Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3631-7_20.

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Boman, Daniel B., Alexander W. Raymond, and Srinivas Garimella. "Applications of Adsorption Heat Pumps." In Mechanical Engineering Series. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-72180-0_5.

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Yu, Kuo-Tsong, and Xigang Yuan. "Application of Computational Mass Transfer (III): Adsorption Process." In Heat and Mass Transfer. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-53911-4_6.

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Yu, Kuo-Tsung, and Xigang Yuan. "Application of Computational Mass Transfer (III)—Adsorption Process." In Heat and Mass Transfer. Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2498-6_4.

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Freni, Angelo, Belal Dawoud, Lucio Bonaccorsi, et al. "Basics of Adsorption Heat Pump Processes." In Characterization of Zeolite-Based Coatings for Adsorption Heat Pumps. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-09327-7_1.

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Conference papers on the topic "Heats of adsorption"

1

Grabowska, Karolina. "PARTICLE SIZE DISTRIBUTION IMPACT ON HEAT AND MASS TRANSFER IN ADSORPTION REACTORS." In 37th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 2024). ECOS 2024, 2024. http://dx.doi.org/10.52202/077185-0197.

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Wang, Xiaolin, Wolfgang Zimmermann, Kim Choon Ng, Lizhen Gao, and Ju¨rgen U. Keller. "Experimental Investigations of the Adsorption of NH3 on Silica Gel-Based Adsorbent." In ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72232.

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The silica gel-water working pair has been commonly used for commercial adsorption chillers due to the environmental benign refrigerant and low desorption temperature (less than 85°C). However, the application has been constrained due to the vacuum working condition and Ice point. This motivates researchers to investigate alternative working pairs. The silica gel-based adsorbents - ammonia working pairs have been found to be the most promising alternative. The isotherms and heats of adsorption of the working pair are essential to be investigated for designing the adsorption reactor and predicting the chiller performance. A novel sensor-gas calorimeter has been used to simultaneously measure the adsorption isotherm and heats of adsorption. The experimental results for adsorption of ammonia on the pure silica gel and silica gel treated with different weight percentage of calcium chlorine are presented.

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Fowkes, Frederick M., T. B. Lloyd, W. J. Chen, and G. W. Heebner. "Zeta-potentials and heats of adsorption of charge-control agents on liquid toners." In SC - DL tentative, edited by Joseph Gaynor. SPIE, 1990. http://dx.doi.org/10.1117/12.19840.

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Jenks, J. J., Ward Tegrotenhuis, Radha K. Motkuri, Brian K. Paul, and B. Peter McGrail. "A Computational and Experimental Study of Metal and Covalent Organic Frameworks Used in Adsorption Cooling." In ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/icnmm2015-48822.

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Metal-organic frameworks (MOFs) have recently attracted enormous interest over the past few years due to their potential applications in energy storage and gas separation. However, there have been few reports on MOFs for adsorption cooling applications. Adsorption cooling technology is an established alternative to mechanical vapor compression refrigeration systems. Adsorption cooling is an excellent alternative in industrial environments where waste heat is available. Applications also include hybrid systems, refrigeration, powerplant dry cooling, cryogenics, vehicular systems and building HVAC. Adsorption based cooling and refrigeration systems have several advantages including few moving parts and negligible power consumption. Key disadvantages include large thermal mass, bulkiness, complex controls, and low COP (0.2–0.5). We explored the use of metal organic frameworks that have very high mass loading and relatively low heats of adsorption, with certain combinations of refrigerants to demonstrate a new type of highly efficient adsorption chiller. An adsorption chiller based on MOFs suggests that a thermally-driven COP>1 may be possible with these materials, which would represent a fundamental breakthrough in performance of adsorption chiller technology. Computational fluid dynamics combined with a system level lumped-parameter model have been used to project size and performance for chillers with a cooling capacity ranging from a few kW to several thousand kW. In addition, a cost model has been developed to project manufactured cost of entire systems. These systems rely on stacked micro/mini-scale architectures to enhance heat and mass transfer. Presented herein are computational and experimental results for hydrophyilic MOFs, fluorophilic MOFs and also flourophilic Covalent-organic frameworks (COFs).

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ZANNONI, I., J. WEIGLE, J. PHILLIPS, and L. R. RADOVIC. "ON THE FEASIBILITY OF CO2 SEQUESTRATION IN COAL MINES: COMPARISON OF HEATS OF ADSORPTION OF CO2 AND CH4." In Proceedings of the Second Pacific Basin Conference. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812793331_0102.

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Pacheco-Vega, Arturo, Luis Enrique Vilchiz-Bravo, and Brent E. Handy. "PID-Based Thermal Control in Heat Conduction Micro-Calorimeters." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-37093.

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Strategies based on the principle of heat flow and temperature control were implemented, and experimentally tested, to increase the sensitivity of a Tian-Calvet microcalorimeter for measuring heats of adsorption. Here, both heat-flow and temperature control schemes were explored to diminish heater-induced thermal variations within the heat sink element hence obtaining less noise in the baseline signal. PID controllers were implemented within a closed-loop system to perform the control actions in an calorimetric setup. The experimental results demonstrate that the heat flow control strategy provided a better baseline stability when compared to the temperature control. A modified control strategy is then suggested to maintain a stable core temperature and signal noise level in the system.

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Amel, Fedol, and A. Cheriti. "Modelling the Water Sorption Isotherms of Warionia Saharae and determination of sorption heats and drying kinetics." In 21st International Drying Symposium. Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/ids2018.2018.7669.

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The hygroscopic equilibrium of Warionia saharae was studied, which allowed getting an idea of the equilibrium water content relative to a given humidity. The results of this study made it possible to have the sorption curves. The results of this study made it possible to obtain the sorption curves necessary for know the storage conditions of the plant and the study of its drying kinetics. The static gravimetric method was used to determine sorption isotherms of Warionia saharae leaves at 30and 40 ◦C and in the range of water activity varying from 0.063 to 0.898. The Gab, Peleg models was found to be the most suitable for describing the sorption curves. The isosteric heat calculated by applying the Clausius–Clapeyron equation .The desorption isosteric heat was higher than the isosteric heat of adsorption and both decreased continuously with increasing of the equilibrium moisture content. The experimental results obtained allowed us to determine the temporal evolution of the drying kinetics as a function of the moisture content. The curve of the evolution of the water content as a function of time shows the absence of the phases product temperature and constant drying rate Keywords: Sorption isotherm, isosteric heats, modelling, kinetics, Warionia saharae.

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Saha, Bidyut B., Anutosh Chakraborty, Ibrahim I. El-Sharkawy, Shigeru Koyama, Kim Choon Ng, and Kandadai Srinivasan. "On Thermodynamics of Advanced Adsorption Cooling Devices." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68615.

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This article presents a thermodynamic framework for the estimation of the minimum driving heat source temperature of an advanced adsorption cooling device from the rigor of Boltzmann distribution function and the condensation approximation of adsorptive molecules on adsorbent porous surface. The calculated resuls are validated with our own experimentally measured data. From this thermodynamic analysis, an interesting and useful finding has been established that it is possible to develop an adsorption cooling device that operates with a driving heat source temperature as low as 40 °C along with a coolant of temperature 30 °C. We have also presented here the thermodynamic modeling and experimental investigation of an advanced adsorption chiller for understanding its working principles.

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Murthy, D. S., S. V. Sivakumar, Keshav Kant, and D. P. Rao. "Process Intensification in a ‘Simulated Moving-Bed’ Heat Regenerator." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56297.

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The solid-gas contacting for thermal storage and thermal recovery is generally carried out in fixed-bed regenerators. Compared to a fixed bed, higher thermal recovery can be achieved in a moving bed with countercurrent flow of gas and solids. However, the moving beds have not been widely used due to difficulties in solid handling. The relative movement of the bed to the gas flow can be simulated in a fixed bed by moving the inlet and outlet ports of the gas along the length of the bed. Similar simulated moving-beds are already in use for adsorptive separation of liquid mixtures in chemical industries. A Novel Moving-Port system is proposed to achieve simulated moving-bed operation in a fixed bed. We have carried out studies to evaluate the relative performance of the fixed and the simulated moving bed heat regenerators. We have examined the feasibility of replacing a set of three blast furnaces and thermal regeneration of an adsorption bed with the simulated moving-bed regenerator. It is found that high heat transfer intensification can be achieved. The results indicate that the volume of the Simulated Moving-Bed regenerator required is about 100 times smaller than the blast-furnace stoves. The heat transfer intensification is high enough to carry out thermal regeneration of the adsorption beds in a cycle time that is in the range of the pressure swing adsorption, which is favored for its faster rate of regeneration.

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Meunier, F. "ADSORPTION COOLING AND HEAT PUMPS." In Heat Pipe Technology: Volume 1. Fundamentals and Experimental Studies. Begellhouse, 2023. http://dx.doi.org/10.1615/ihpc1990v1.210.

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Reports on the topic "Heats of adsorption"

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Snurr, Randall Q., Joseph T. Hupp, Mercouri G. Kanatzidis, and SonBinh T. Nguyen. New Carbon-Based Porous Materials with Increased Heats of Adsorption for Hydrogen Storage. Office of Scientific and Technical Information (OSTI), 2014. http://dx.doi.org/10.2172/1163140.

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Johnson, Justin. Fluorinated Covalent Organic Frameworks: A Novel Pathway to Enhance Hydrogen Sorption and Control Isosteric Heats of Adsorption; HyMARC Seed Project Final Report. Office of Scientific and Technical Information (OSTI), 2020. http://dx.doi.org/10.2172/1735636.

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Lively, Ryan, David Sholl, Krista Walton, et al. Enabling 10mol/kg Swing Capacity via Heat Integrated Sub-ambient Pressure Swing Adsorption. Office of Scientific and Technical Information (OSTI), 2019. http://dx.doi.org/10.2172/1576756.

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McGrail, Bernard, Bruce Bernacki, Ognjen Ilic, et al. Selective Thermal Emission with Radiation and Adsorption in Annuli (STERADIAN): An Advanced Heat Exchanger Concept for Supercritical CO2 Power Cycles. Office of Scientific and Technical Information (OSTI), 2022. https://doi.org/10.2172/2562683.

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Shomer, Ilan, Ruth E. Stark, Victor Gaba, and James D. Batteas. Understanding the hardening syndrome of potato (Solanum tuberosum L.) tuber tissue to eliminate textural defects in fresh and fresh-peeled/cut products. United States Department of Agriculture, 2002. http://dx.doi.org/10.32747/2002.7587238.bard.

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The project sought to understand factors and mechanisms involved in the hardening of potato tubers. This syndrome inhibits heat softening due to intercellular adhesion (ICA) strengthening, compromising the marketing of industrially processed potatoes, particularly fresh peeled-cut or frozen tubers. However, ICA strengthening occurs under conditions which are inconsistent with the current ideas that relate it to Ca-pectate following pectin methyl esterase (PME) activity or to formation of rhamnogalacturonan (RG)-II-borate. First, it was necessary to induce strengthening of the middle lamellar complex (MLX) and the ICA as a stress response in some plant parenchyma. As normally this syndrome does not occur uniformly enough to study it, we devised an efficient model in which ICA-strengthening is induced consistently under simulated stress by short-chain, linear, mono-carboxylic acid molecules (OAM), at 65 oC [appendix 1 (Shomer&Kaaber, 2006)]. This rapid strengthening was insufficient for allowing the involved agents assembly to be identifiable; but it enabled us to develop an efficient in vitro system on potato tuber parenchyma slices at 25 ºC for 7 days, whereas unified stress was reliably simulated by OAMs in all the tissue cells. Such consistent ICA-strengthening in vitro was found to be induced according to the unique physicochemical features of each OAM as related to its lipophilicity (Ko/w), pKa, protonated proportion, and carbon chain length by the following parameters: OAM dissociation constant (Kdiss), adsorption affinity constant (KA), number of adsorbed OAMs required for ICA response (cooperativity factor) and the water-induced ICA (ICAwater). Notably, ICA-strengthening is accompanied by cell sap leakage, reflecting cell membrane rupture. In vitro, stress simulation by OAMs at pH<pKa facilitated the consistent assembly of ICAstrengthening agents, which we were able to characterize for the first time at the molecular level within purified insoluble cell wall of ICA-strengthened tissue. (a) With solid-state NMR, we established the chemical structure and covalent binding to cell walls of suberin-like agents associated exclusively with ICA strengthening [appendix 3 (Yu et al., 2006)]; (b) Using proteomics, 8 isoforms of cell wall-bound patatin (a soluble vacuolar 42-kDa protein) were identified exclusively in ICA-strengthened tissue; (c) With light/electron microscopy, ultrastructural characterization, histochemistry and immunolabeling, we co-localized patatin and pectin in the primary cell wall and prominently in the MLX; (d) determination of cell wall composition (pectin, neutral sugars, Ca-pectate) yielded similar results in both controls and ICA-strengthened tissue, implicating factors other than PME activity, Ca2+ or borate ions; (e) X-ray powder diffraction experiments revealed that the cellulose crystallinity in the cell wall is masked by pectin and neutral sugars (mainly galactan), whereas heat or enzymatic pectin degradation exposed the crystalline cellulose structure. Thus, we found that exclusively in ICA-strengthened tissue, heat-resistant pectin is evident in the presence of patatin and suberinlike agents, where the cellulose crystallinity was more hidden than in fresh control tissue. Conclusions: Stress response ICA-strengthening is simulated consistently by OAMs at pH< pKa, although PME and formation of Ca-pectate and RG-II-borate are inhibited. By contrast, at pH>pKa and particularly at pH 7, ICA-strengthening is mostly inhibited, although PME activity and formation of Ca-pectate or RG-II-borate are known to be facilitated. We found that upon stress, vacuolar patatin is released with cell sap leakage, allowing the patatin to associate with the pectin in both the primary cell wall and the MLX. The stress response also includes formation of covalently bound suberin-like polyesters within the insoluble cell wall. The experiments validated the hypotheses, thus led to a novel picture of the structural and molecular alterations responsible for the textural behavior of potato tuber. These findings represent a breakthrough towards understanding of the hardening syndrome, laying the groundwork for potato-handling strategies that assure textural quality of industrially processed particularly in fresh peeled cut tubers, ready-to-prepare and frozen preserved products.

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