Academic literature on the topic 'Decomposition (Chemistry) Catalysis'

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Journal articles on the topic "Decomposition (Chemistry) Catalysis"

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Ortega-Caballero, Fernando, and Mikael Bols. "Cyclodextrin derivatives with cyanohydrin and carboxylate groups as artificial glycosidases." Canadian Journal of Chemistry 84, no. 4 (2006): 650–58. http://dx.doi.org/10.1139/v06-039.

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Two cyclodextrin derivatives (1 and 2) were prepared in an attempt to create glycosidase mimics with a general acid catalyst and a nucleophilic carboxylate group. The catalysts 1 and 2 were found to catalyse the hydrolysis of 4-nitrophenyl β-D-glucopyranoside at pH 8.0, but rapidly underwent decomposition with loss of hydrogen cyanide to convert the cyanohydrin to the corresponding aldehyde. The initial rate of the catalysis shows that the cyanohydrin group in these molecules functions as a good catalyst, but that the carboxylate has no positive effect. The decomposition product aldehydes disp
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Lahiri, Preeti, and Susanta K. Sengupta. "Spinel ferrites as catalysts: A study on catalytic effect of coprecipitated ferrites on hydrogen peroxide decomposition." Canadian Journal of Chemistry 69, no. 1 (1991): 33–36. http://dx.doi.org/10.1139/v91-006.

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Some ferrospinels act as catalysts for the decomposition of H2O2, their effectiveness is dependent on the composition of the catalyst. This study is to find the most effective catalyst of stoichiometry MIIFe2IIIO4. A set of ferrites of different composition MIIFe2II04 (MII = Mn, Co, Ni, Cu, Zn, Cd) was synthesized by co-precipitation and characterized by chemical analysis, X-ray diffractometry, and B.E.T. technique. A comparative assessment of the catalytic power of these ferrites from investigations of their influence on the kinetics of H2O2 decomposition in a neutral medium was made. An anal
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Nevěčná, Taťjana, Oldřich Pytela, Miroslav Ludwig, and Jaromír Kaválek. "Solvent effects on kinetics and mechanism of acid-catalyzed decomposition of 1,3-bis(4-methylphenyl)triazene I. Reactions in alcohols." Collection of Czechoslovak Chemical Communications 55, no. 1 (1990): 147–55. http://dx.doi.org/10.1135/cccc19900147.

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The effect of protic solvents (methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, cyclohexanol) has been studied on the kinetics and mechanism of acid-catalyzed decomposition of 1,3-bis(4-methylphenyl)triazene, using trichloroacetic acid as the acid catalyst. Both the non-dissociated acid and the proton have been found to be catalytically active. The mechanism of splitting of the triazene substrate with the non-dissociated acid involves the general acid catalysis. Comparison of the catalytic rate constants of the two acid catalysts and effect of solvents on these values indicate
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Pacultová, Bílková, Klegova, et al. "Co-Mn-Al Mixed Oxides Promoted by K for Direct NO Decomposition: Effect of Preparation Parameters." Catalysts 9, no. 7 (2019): 593. http://dx.doi.org/10.3390/catal9070593.

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Fundamental research on direct NO decomposition is still needed for the design of a sufficiently active, stable and selective catalyst. Co-based mixed oxides promoted by alkali metals are promising catalysts for direct NO decomposition, but which parameters play the key role in NO decomposition over mixed oxide catalysts? How do applied preparation conditions affect the obtained catalyst’s properties?
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Fakeeha, Anis, Siham Barama, Ahmed Ibrahim, et al. "In Situ Regeneration of Alumina-Supported Cobalt–Iron Catalysts for Hydrogen Production by Catalytic Methane Decomposition." Catalysts 8, no. 11 (2018): 567. http://dx.doi.org/10.3390/catal8110567.

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A novel approach to the in situ regeneration of a spent alumina-supported cobalt–iron catalyst for catalytic methane decomposition is reported in this work. The spent catalyst was obtained after testing fresh catalyst in catalytic methane decomposition reaction during 90 min. The regeneration evaluated the effect of forced periodic cycling; the cycles of regeneration were performed in situ at 700 °C under diluted O2 gasifying agent (10% O2/N2), followed by inert treatment under N2. The obtained regenerated catalysts at different cycles were tested again in catalytic methane decomposition react
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Nesterov, Dmytro S., and Oksana V. Nesterova. "Catalytic Oxidations with Meta-Chloroperoxybenzoic Acid (m-CPBA) and Mono- and Polynuclear Complexes of Nickel: A Mechanistic Outlook." Catalysts 11, no. 10 (2021): 1148. http://dx.doi.org/10.3390/catal11101148.

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Selective catalytic functionalization of organic substrates using peroxides as terminal oxidants remains a challenge in modern chemistry. The high complexity of interactions between metal catalysts and organic peroxide compounds complicates the targeted construction of efficient catalytic systems. Among the members of the peroxide family, m-chloroperoxybenzoic acid (m-CPBA) exhibits quite complex behavior, where numerous reactive species could be formed upon reaction with a metal complex catalyst. Although m-CPBA finds plenty of applications in fine organic synthesis and catalysis, the factors
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Voitko, K. V., O. M. Bakalinska, Yu V. Goshovska, Yu I. Sementsov, and M. T. Kartel. "Catalase-like properties of multilayer graphene oxides and their modified forms." Surface 12(27) (December 30, 2020): 251–62. http://dx.doi.org/10.15407/surface.2020.12.251.

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The catalytic system, that mimets catalase enzyme such as “multilayer graphene oxide /peroxide molecule” in aqueous media was investigated. The main factors that influence on catalyst’s effectiveness were determining. The catalytic activity of as-synthesized multilayered graphene oxides, and their modified forms (oxidized and nitrogen doped) were investigated in the decomposition of hydrogen peroxides at room temperature and physiological pHs by measuring the volume of released gases. A phosphate buffer with a pH of 5 to 8 was chosen as the reaction medium. The original and modified samples we
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Maitarad, Phornphimon, Vinich Promarak, Liyi Shi, and Supawadee Namuangruk. "Effect of Water Molecule on Photo-Assisted Nitrous Oxide Decomposition over Oxotitanium Porphyrin: A Theoretical Study." Catalysts 10, no. 2 (2020): 157. http://dx.doi.org/10.3390/catal10020157.

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Water vapor has generally been recognized as an inhibitor of catalysts in nitrous oxide (N2O) decomposition because it limits the lifetime of catalytic reactors. Oxygen produced in reactions also deactivates the catalytic performance of bulk surface catalysts. Herein, we propose a potential catalyst that is tolerant of water and oxygen in the process of N2O decomposition. By applying density functional theory calculations, we investigated the reaction mechanism of N2O decomposition into N2 and O2 catalyzed by oxotitanium(IV) porphyrin (TiO-por) with interfacially bonded water. The activation e
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Chen, Long, Haitao Liu, Keli Yang, Jiankang Wang, and Xiaolai Wang. "Catalytic synthesis of carbon nanotubes from the decomposition of methane over a Ni–Co/La2O3 catalyst." Canadian Journal of Chemistry 87, no. 1 (2009): 47–53. http://dx.doi.org/10.1139/v08-077.

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The production of multi-walled carbon nanotubes (MWNTs) by the catalytic chemical vapour deposition (CCVD) method was examined over a series of Ni–Co/La2O3 catalysts with methane as the carbon source. The catalyst composition and the reaction conditions were optimized by analyzing the effluent gas with gas chromatography. Various techniques, such as X-ray diffraction (XRD), Transmission electron microscopy (TEM), Raman spectra, and Thermal gravimetric analysis (TGA) were used to characterize the catalysts and products. The results indicate that the unreduced catalyst 30Ni–10Co/La2O3 showed the
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Tišler, Zdeněk, Anna Klegová, Eliška Svobodová, et al. "Cobalt Based Catalysts on Alkali-Activated Zeolite Foams for N2O Decomposition." Catalysts 10, no. 12 (2020): 1398. http://dx.doi.org/10.3390/catal10121398.

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In this work, we studied the effect of alkali-activated zeolite foams modifications on properties and catalytic activity of cobalt phases in the process of catalytic decomposition of N2O. The zeolite foam supports were prepared by alkali activation of natural zeolite followed by acid leaching and ion exchange. The cobalt catalysts were synthesised by a different deposition technique (direct ion exchange (DIE) and incipient wetness impregnation (IWI) method of cobalt on zeolite foams. For comparison, catalysts on selected supports were prepared and the properties of all were compared in catalyt
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Dissertations / Theses on the topic "Decomposition (Chemistry) Catalysis"

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LaLama, Matthew. "Rhodium-Catalyzed Decomposition of Carbohydrate Diazo Esters." Youngstown State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1532881612843223.

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Vijay, Rohit. "Discovery and mechanistic investigation of nitrogen oxides traps and ammonia decomposition catalysts using high-throughput experimentation." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 346 p, 2008. http://proquest.umi.com/pqdweb?did=1459913411&sid=9&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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Boatright, David L. "Kinetic and mechanistic studies of the thermal decomposition of glycolate and N-Nitrosoiminodiacetic acid in aqueous basic salt solutions : II Phase transfer catalysis in supercritical fluids." Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/29885.

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Jones, Simon Philip. "Influence of modifiers on Palladium based nanoparticles for room temperature formic acid decomposition." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:873277f2-c4f7-45b7-a16d-bba064e24bee.

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Heterogeneous catalysts form a highly important part of everyday life, ranging from the production of fertiliser enabling the growth of crops that sustain much of the world's population to the production of synthetic fuels. They constitute a key part of the chemical industry and contribute towards substantial economic and environmental benefits. Heterogeneous catalysts are also believed to have an important role to play in a future hydrogen economy, reducing our requirements for fossil fuels. To this end, formic acid has been proposed as a potential hydrogen storage material for small portable
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Serra, Maia Rui Filipe. "Relation between surface structural and chemical properties of platinum nanoparticles and their catalytic activity in the decomposition of hydrogen peroxide." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/85149.

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The disproportionation of H₂O₂ to H₂O and molecular O₂ catalyzed by platinum nanocatalysts is technologically very important in several energy conversion technologies, such as steam propellant thrust applications and hydrogen fuel cells. However, the mechanism of H₂O₂ decomposition on platinum has been unresolved for more than 100 years and the kinetics of this reaction were poorly understood. Our goal was to quantify the effect of reaction conditions and catalyst properties on the decomposition of H₂O₂ by platinum nanocatalysts and determine the mechanism and rate-limiting step of the reactio
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Beng, Timothy Kum. "Kinetics and mechanism of the catalysis of the decomposition of hydrogen peroxide by Schiff base complexes of copper(II)." [Johnson City, Tenn. : East Tennessee State University], 2004. http://etd-submit.etsu.edu/etd/theses/available/etd-1113104-182005/unrestricted/BengT120104f.pdf.

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Thesis (M.S.)--East Tennessee State University, 2004.<br>Title from electronic submission form. ETSU ETD database URN: etd-1113104-182005 Includes bibliographical references. Also available via Internet at the UMI web site.
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Driscoll, Darren Matthew. "Spectroscopic Studies of Small Molecule Adsorption and Oxidation on TiO2-Supported Coinage Metals and Zr6-based Metal-Organic Frameworks." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/100685.

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Developing a fundamental understanding of the interactions between catalytic surfaces and adsorbed molecules is imperative to the rational design of new materials for catalytic, sorption and gas separation applications. Experiments that probed the chemistry at the gas-surface interface were employed through the utilization of in situ infrared spectroscopic measurements in high vacuum conditions to allow for detailed and systematic investigations into adsorption and reactive processes. Specifically, the mechanistic details of propene epoxidation on the surface of nanoparticulate Au supported on
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Sanchez, Trujillo Felipe Juan. "Investigation of the catalytic performance of palladium-based catalysts for hydrogen production from formic acid decomposition." Thesis, Cardiff University, 2018. http://orca.cf.ac.uk/117629/.

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The objective of this work is to present formic acid as a suitable compound to be used in a hydrogen economy. Catalytic decomposition of formic acid at mild conditions is evaluated as a model reaction for hydrogen generation, making emphasis on the productivity, reusability of the catalysts, and quantification of concomitant CO evolved from the reaction. Characterisation of the fresh and used catalysts is performed to study the activity/structure relationship and investigate the possible reasons for its deactivation. Computational calculations are used to support experimental data and correlat
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Zhang, Hongxia. "Study of the effect of gold, platinum and vanadium oxide additives on the activity of TiO₂-ZrO₂ mixed oxide for the decomposition of CFC-22." HKBU Institutional Repository, 2002. http://repository.hkbu.edu.hk/etd_ra/367.

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Malich, Ashley M. "Decomposition of Novel Diazosugars: Effects on Regioselectivity." Youngstown State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1222195006.

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Books on the topic "Decomposition (Chemistry) Catalysis"

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Arrowsmith, Cheryl Hillock. Two studies in physical organic chemistry: I. Bifunctional catalysis of the decomposition of the nitramide anion. II. Hydrogen isotope effects on carbon-13 NMR chemical shifts. 1986.

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O, Apel'baum L., and United States. National Aeronautics and Space Administration., eds. Study of the kinetics of catalytic decomposition of hydrazine vapors on palladium. National Aeronautics and Space Administration, 1987.

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Book chapters on the topic "Decomposition (Chemistry) Catalysis"

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LUI, K., S. AKHTER, and H. H. KUNG. "Temperature-Programmed Decomposition of 2-Propanol on the Zinc-Polar, Nonpolar, and Oxygen-Polar Surfaces of Zinc Oxide." In Solid State Chemistry in Catalysis. American Chemical Society, 1985. http://dx.doi.org/10.1021/bk-1985-0279.ch012.

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Bespalova, Natalia B., Alexey V. Nizovtsev, Vladimir V. Afanasiev, and Egor V. Shutko. "Metathesis Catalysts Stability and Decomposition Pathway." In Metathesis Chemistry. Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-6091-5_7.

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Michalkova, A., and J. Leszczynski. "Catalytic Decomposition of Organophosphorus Compounds." In Practical Aspects of Computational Chemistry. Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2687-3_13.

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"Chapter 10 Decomposition, Hydrogenation and Related Reactions." In Transition Metal Oxides - Surface Chemistry and Catalysis. Elsevier, 1989. http://dx.doi.org/10.1016/s0167-2991(08)60933-7.

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Dalton, David R. "The Soil." In The Chemistry of Wine. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190687199.003.0012.

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The widespread practices of viniculture (the study of production of grapes for wine) and oenology (the study of winemaking) affirm the generalization that grapevines have fewer problems with mineral deficiency than many other crops. Only occasionally is the addition of iron (Fe), phosphorus (P), magnesium (Mg), and manganese (Mn) supplements to the soil needed. Addition of potassium (K), zinc (Zn), and boron (B) to the soil is more common. And, of course, nitrogen (N) is critical for the production of proteins. Over the years, various transition metals (metals in groups three through twelve [3– 12] of the periodic table, Appendix 1) have been shown to be generally important. These groups include iron (Fe), magnesium (Mg), manganese (Mn), zinc (Zn), and copper (Cu). Many metals are bound to organic molecules that are important for life. Some of the metals, such as copper (Cu) and iron (Fe), are important in electron transport while others, including manganese (Mn) and iron (Fe), inhibit reactive oxygen (O) species (ROSs) that can destroy cells. Metals serve both to cause some reactions to speed up, called positive catalysis while caus¬ing others (e.g., unwanted oxidation) to slow down (negative catalysis). It is not uncommon to add nitrogen (N), in the form of ammonium salts such as ammonium nitrate (NH4NO3), as fertilizer to the soil in which the vines are growing. It is also common to increase the nitrogen (N) content in the soil by planting legumes (legumes have roots that are frequently colonized by nitrogen-fixing bacteria). Nitrogen- fixing bacteria convert atmospheric nitrogen (N2), which plants cannot use, to forms, such as ammonia (NH3) or its equivalent, capable of absorption by plants. Nitrogen, used in plant proteins, tends to remain in the soil after harvest or decomposition. With sufficient nitrogen present in the soil the growth cycle can begin again in the following season without adding too much fertilizer. In a more general sense, however, it is clear (as mentioned earlier) that the soil must be capable of good drainage so the sub-soil parts of the plant do not rot and it must be loose enough to permit oxygen to be available to the growing roots.
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"Ozone Decomposition On The Surface Of Metal Oxide Catalyst." In Process Advancement in Chemistry and Chemical Engineering Research. Apple Academic Press, 2016. http://dx.doi.org/10.1201/b19839-16.

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Bunker, Bruce C., and William H. Casey. "Photochemistry and Excited-State Reactions of Oxides." In The Aqueous Chemistry of Oxides. Oxford University Press, 2016. http://dx.doi.org/10.1093/oso/9780199384259.003.0020.

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The applied voltages that drive electrochemical processes (see Chapter 11) are only one of many energy sources that can be used to activate reactions in oxide molecules and materials. Another common energy source that drives many environmental and technological oxide reactions is light from the sun. Water plays a key role in many of these reactions. Imagine that you are on vacation floating in a warm ocean bathed by the sun. Many of the phenomena you experience, from your painful sunburn to the photosynthetic growth of the seaweed you see beneath you, are photoactivated processes. In this chapter, we highlight the roles that oxides play in photon-activated solar energy technologies. Also included are reactions stimulated by other nonthermal energy sources, including electrons in high-energy plasmas. Titanium oxide, found in common white paint, is the basis for much of the discussion, because this oxide is used in many photoelectrochemical energy storage technologies. The photochemistry of colloidal manganese- and iron-oxide particles suspended either in atmospheric droplets or in the upper photic zone of the ocean where the sunlight penetrates are discussed in Chapter 18. Such oxide reactions are important globally in the elimination of pollutants. Both industrial and environmental examples illustrate how oxides participate in a wide range of photoactivated chemical reactions, including the catalytic decomposition of water, photoelectrochemistry, and photoactivated dissolution and precipitation reactions. Before exploring excited-state reactions, we need to introduce the energy sources that provide such excitation. In most of this chapter, the excitation source of interest is light. Most of us are familiar with the electromagnetic spectrum, in which the energy of a photon is given by . . . E=hv=hc/λ=hcω (13.1). . . Here, h is Planck’s constant (h = 6.6 ·10 −34 J/second), c is the speed of light (3 ·1010cm/second), ν is the frequency of light (measured in Hertz or per second), λ is the wavelength of light (in centimeters), and ω is the wavelength expressed as wave number (measured per centimeter in infrared spectroscopy).
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Ross, John, Igor Schreiber, and Marcel O. Vlad. "Introduction." In Determination of Complex Reaction Mechanisms. Oxford University Press, 2006. http://dx.doi.org/10.1093/oso/9780195178685.003.0003.

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Chemical kinetics as a science has existed for more than a century. It deals with the rates of reactions and the details of how a given reaction proceeds from reactants to products. In a chemical system with many chemical species, there are several questions to be asked: What species react with what other species? In what temporal order? With what catalysts? And with what results? The answers constitute the macroscopic reaction mechanism. The process can be described macroscopically by listing the reactants, intermediates, products, and all the elementary reactions and catalysts in the reaction system. The present book is a treatise and text on the determination of complex reaction mechanisms in chemistry and in chemical reaction systems that occur in chemical engineering, biochemistry, biology, biotechnology, and genomics. A basic knowledge of chemical kinetics is assumed. Several approaches are suggested for the deduction of information on the causal chemical connectivity of the species, on the elementary reactions among the species, and on the sequence of the elementary reactions that constitute the reaction pathway and the reaction mechanism. Chemical reactions occur by the collisions of molecules, and such an event is called an elementary reaction for specified reactant and product molecules. A balanced stoichiometric equation for an elementary reaction yields the number of each type of molecule according to conservation of atoms, mass, and charge. Figure 1.1 shows a relatively simple reaction mechanism for the decomposition of ozone by light, postulated to occur in a series of three elementary steps. (The details of collisions of molecules and bond rearrangements are not discussed.) All approaches are based on the measurements of the concentrations of chemical species in the whole reaction system, not on parts, as has been the practice. One approach is called the pulse method, in which a pulse of concentration of one or more species of arbitrary strength is applied to a reacting system and the responses of as many species as possible are measured. From these responses causal chemical connectivities may be inferred. The basic theory is explained, demonstrated on a model mechanism, and tested in an experiment on a part of glycolysis.
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Conference papers on the topic "Decomposition (Chemistry) Catalysis"

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Iost, K. N., V. A. Borisov, N. S. Smirnova, et al. "Resistance for methanation and activity in ammonia decomposition catalysts Ru-Rb/Sibunit." In 21ST CENTURY: CHEMISTRY TO LIFE. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5122932.

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Hendriyana and Lulu Nurdini. "A TGA-DSC of the thermal decomposition Cu-Mg catalyst precursor with various compositions." In PROCEEDINGS OF THE 5TH INTERNATIONAL SYMPOSIUM ON APPLIED CHEMISTRY 2019. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5134596.

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Luo, Zhaoyu, Parvez Sukheswalla, Scott A. Drennan, Mingjie Wang, and P. K. Senecal. "3D Numerical Simulations of Selective Catalytic Reduction of NOx With Detailed Surface Chemistry." In ASME 2017 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icef2017-3658.

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Environmental regulations have put stringent requirements on NOx emissions in the transportation industry, essentially requiring the use of exhaust after-treatment on diesel fueled light and heavy-duty vehicles. Urea-Water-Solution (UWS) based Selective Catalytic Reduction (SCR) for NOx is one the most widely adopted methods for achieving these NOx emissions requirements. Improved understanding and optimization of SCR after-treatment systems is therefore vital, and numerical investigations can be employed to facilitate this process. For this purpose, detailed and numerically accurate models ar
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