Relevant bibliographies by topics / Hopcalite

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Hopcalite'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "Hopcalite"

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Zhang, Yunke, Marianna A. Busch, and Kenneth W. Busch. "Pre-Excitation, Catalytic Oxidation of Analytes over Hopcalite in Flame/Furnace Infrared Emission (FIRE) Spectrometry." Applied Spectroscopy 46, no. 4 (April 1992): 631–39. http://dx.doi.org/10.1366/0003702924125096.

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Gas-phase infrared emission measurements made with the use of a new, specially designed, electrically heated furnace or a small hydrogen/air flame have shown that oxidation of a variety of carbon-based analytes to CO2 over the catalyst hopcalite prior to vibrational excitation in the furnace or flame markedly improves the response of the FIRE radiometer. Calibration curves obtained with the use of the furnace alone were generally nonlinear, while those obtained with the flame alone had slopes that were compound dependent. By the use of hopcalite in conjunction with the furnace, conversion to CO2 was significantly improved, and the FIRE response to pure acetone, benzene, dichloromethane, 1-chloro-2-methylpropane, heptane, methanol, and toluene became directly proportional to the number of moles of carbon introduced. In the case of the flame, as little as 0.1 g of hopcalite was sufficient to give a single, linear calibration curve (based on moles of carbon) for injection volumes of 0.2–1.0 μL of a test mixture composed of equal volumes of acetone, benzene, hexane, propanol, and tetrahydrofuran. With the use of hopcalite at its experimentally determined, optimum operating temperature of 380°C, an air flow rate of 45 mL min−1, and a furnace temperature of 600°C, the detection limit for hexane was found to be 518 ng C s−1. The use of hopcalite in conjunction with the flame (900°C) improved this detection limit by two orders of magnitude, due to the combined effects of an increase in excitation temperature and a decrease in source background noise. Injection of chlorinated compounds was found to temporarily poison the hopcalite, resulting in soot formation and loss of catalytic activity for periods of approximately ten minutes.
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Biemelt, T., K. Wegner, J. Teichert, and S. Kaskel. "Microemulsion flame pyrolysis for hopcalite nanoparticle synthesis: a new concept for catalyst preparation." Chemical Communications 51, no. 27 (2015): 5872–75. http://dx.doi.org/10.1039/c5cc00481k.

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Kireev, A. S., V. M. Mukhin, S. G. Kireev, V. N. Klushin, and S. N. Tkachenko. "Preparation and properties of modified hopcalite." Russian Journal of Applied Chemistry 82, no. 1 (January 2009): 169–71. http://dx.doi.org/10.1134/s1070427209010339.

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Jaworska-Galas, Z., W. Mista, J. Wrzyszcz, and M. Zawadzki. "Thermal stability improvement of hopcalite catalyst." Catalysis Letters 24, no. 1-2 (1994): 133–39. http://dx.doi.org/10.1007/bf00807383.

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Dey, Subhashish, Ganesh Chandra Dhal, Devendra Mohan, and Ram Prasad. "Study of Hopcalite (CuMnOx) Catalysts Prepared Through A Novel Route for the Oxidation of Carbon Monoxide at Low Temperature." Bulletin of Chemical Reaction Engineering & Catalysis 12, no. 3 (October 28, 2017): 393. http://dx.doi.org/10.9767/bcrec.12.3.882.393-407.

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Carbon monoxide (CO) is a poisonous gas, recognized as a silent killer. The gas is produced by incomplete combustion of carbonaceous fuel. Recent studies have shown that hopcalite group is one of the promising catalysts for CO oxidation at low temperature. In this study, hopcalite (CuMnOx) catalysts were prepared by KMnO4 co-precipitation method followed by washing, drying the precipitate at different temperatures (22, 50, 90, 110, and 120 oC) for 12 h in an oven and subsequent calcination at 300 oC in stagnant air, flowing air and in a reactive gas mixture of (4.5% CO in air) to do the reactive calcination (RC). The prepared catalysts were characterized by XRD, FTIR, SEM-EDX, XPS, and BET techniques. The activity of the catalysts was evaluated in a tubular reactor under the following conditions: 100 mg catalyst, 2.5% CO in air, total flow rate 60 mL/min and temperature varying from ambient to a higher value, at which complete oxidation of CO was achieved. The order of calcination strategies based on activity for hopcalite catalysts was observed to be as: RC > flowing air > stagnant air. In the kinetics study of CuMnOx catalyst prepared in RC conditions the frequency factor and activation energy were found to be 5.856×105 (g.mol)/(gcat.h) and 36.98 kJ/gmol, respectively. Copyright © 2017 BCREC Group. All rights reservedReceived: 28th December 2016; Revised: 19th April 2017; Accepted: 19th April 2017; Available online: 27th October 2017; Published regularly: December 2017How to Cite: Dey, S., Dhal, G.C., Mohan, D., Prasad, R. (2017). Study of Hopcalite (CuMnOx) Catalysts Prepared through A Novel Route for the Oxidation of Carbon Monoxide at Low Temperature. Bulletin of Chemical Reaction Engineering & Catalysis, 12 (3): 393-407 (doi:10.9767/bcrec.12.3.882.393-407)
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Kulikov, N. K., S. G. Kireev, A. O. Shevchenko, V. M. Mukhin, S. N. Tkachenko, and T. G. Lupascu. "The Influence of Binding Material on Porous Structure of Shaped Hopcalite." Chemistry Journal of Moldova 3, no. 1 (June 2008): 67–69. http://dx.doi.org/10.19261/cjm.2008.03(1).11.

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The authors have investigated the equilibrated adsorption of water vapors on GFG hopcalite, which was obtained using the extrusion shaping method, with bentonite clay as the binding compound. In the frames of the BET model, the values of the monolayer capacity and the size of medium area occupied by the water molecule in the filled monolayer have been determined. The distribution of pores according to their sizes has been evaluated. It has been established that the modification of the bentonitic clay allows directed construction of the hopcalite porous structure,i.e. the formation of the mesoporous structure with a narrow distribution of the pores capacities by sizes, which was achieved varying the sizes of binding compound particles.
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Sonar, Shilpa, Jean-Marc Giraudon, Savita Kaliya Perumal Veerapandian, Jean-François Lamonier, Rino Morent, Axel Löfberg, and Nathalie De Geyter. "Adsorption Followed by Plasma Assisted Catalytic Conversion of Toluene into CO2 on Hopcalite in an Air Stream." Catalysts 11, no. 7 (July 14, 2021): 845. http://dx.doi.org/10.3390/catal11070845.

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The abatement of toluene was studied in a sequential adsorption-plasma catalysis (APC) process. Within this process, Hopcalite was used as bifunctional material: as adsorbent (storage stage) and as catalyst via the oxidation of adsorbed toluene (discharge stage). It was observed that the desorption and oxidation activity of the adsorbed toluene was significantly affected the process variables. In addition, the adsorption time influenced the CO2 selectivity and CO2 yield by changing the interaction between the catalyst and the plasma generated species. At least four APC sequences were performed for each examined condition suggesting that Hopcalite is very stable under plasma exposure during all the sequences. Consequently, these results could contribute to advance the plasma–catalyst system with an optimal VOC oxidation efficiency. The catalytic activity, amount of toluene adsorbed, amount of toluene desorbed and product formation have been quantified by FT-IR. Moreover, the catalyst was characterized by XRD, H2-TPR, N2 adsorption–desorption analysis and XPS. Hopcalite shows a good CO2 selectivity and CO2 yield when the APC process is performed with an adsorption time of 20 min and a plasma treatment with a discharge power of 46 W which leads to a low energy cost of 11.6 kWh·m−3 and energy yields of toluene and CO2 of 0.18 (±0.01) g·kWh−1 and 0.48 (±0.06) g·kWh−1 respectively.
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Jaworska-Galas, Z., W. Miśta, J. Wrzyszcz, and M. Zawadzki. "Stabilization of hopcalite catalyst in alumina matrix." Reaction Kinetics & Catalysis Letters 48, no. 1 (July 1992): 163–69. http://dx.doi.org/10.1007/bf02070081.

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M. "Preparation-Properties Relation of Mn-Cu Hopcalite Catalyst." American Journal of Applied Sciences 9, no. 2 (February 1, 2012): 265–70. http://dx.doi.org/10.3844/ajassp.2012.265.270.

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Wang, Lin Tong. "Oxidation of Copper Zinc Oxide Catalysts by Carbon Monoxide." Advanced Materials Research 332-334 (September 2011): 564–67. http://dx.doi.org/10.4028/www.scientific.net/amr.332-334.564.

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Copper zinc oxide catalysts are effective for the ambient temperature carbon monoxide oxidation and display higher specific activity than the current commercial hopcalite catalyst. We investigate the copper zinc oxide catalyst prepared by co-precipitation under different atmospheres for the oxidation of carbon monoxide at low temperatures and these systems are now worthy of further investigation.
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Dissertations / Theses on the topic "Hopcalite"

1

Trüe, A., N. Panichev, J. Okonkwo, and PBC Forbes. "Determination of the mercury content of lichens and comparison to atmospheric mercury levels in the South African Highveld Region." Clean Air Journal, 2012. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001242.

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Abstract The concentration of mercury vapour in ambient air is routinely determined using specialised instruments. As an economical alternative, actively pumped Hopcalite sorbent tubes can be used to trap atmospheric mercury, which is subsequently analysed by cold vapour atomic absorption spectroscopy. Plant materials are also readily available in most regions and can be analysed to obtain information on time averaged atmospheric mercury levels. Lichen and tree bark samples were collected in the cities of Pretoria and Witbank, dried and acid digested with subsequent cold vapour atomic absorption spectroscopy. Average mercury concentrations ranging from 74 to 193 μg.kg-1 were found in lichens from three Pretoria suburbs, whilst average Hg levels of 228 μg.kg-1 were determined in lichens collected in Witbank. The average mercury concentration in tree bark was consistently lower than in lichens, with concentrations between 28 and 72 μg.kg-1 determined in samples from three Pretoria suburbs and 75 μg.kg-1 determined in samples taken in Witbank. This study is the first in South Africa to determine mercury levels in lichens and tree bark. Average total gaseous mercury concentrations in ambient air at the three Pretoria suburban sites, as determined by a semi-continuous spectroscopic method using Hopcalite sampling, ranged between 1.6 and 2.5 ng.m-3, while an average of 1.7 ng.m-3 was measured in Witbank over the sampling interval.
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Kaskel, Stefan, Tim Biemelt, Karl Wegner, and Johannes Teichert. "Microemulsion flame pyrolysis for hopcalite nanoparticle synthesis: a new concept for catalyst preparation." Royal Society of Chemistry, 2015. https://tud.qucosa.de/id/qucosa%3A29055.

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A new route to highly active hopcalite catalysts via flame spray pyrolysis of an inverse microemulsion precursor is reported. The nitrate derived nanoparticles are around 15 nm in diameter and show excellent conversion of CO under ambient conditions, outperforming commercial reference hopcalite materials produced by co-precipitation.
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Kaskel, Stefan, Tim Biemelt, Karl Wegner, and Johannes Teichert. "Microemulsion flame pyrolysis for hopcalite nanoparticle synthesis: a new concept for catalyst preparation." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-188993.

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A new route to highly active hopcalite catalysts via flame spray pyrolysis of an inverse microemulsion precursor is reported. The nitrate derived nanoparticles are around 15 nm in diameter and show excellent conversion of CO under ambient conditions, outperforming commercial reference hopcalite materials produced by co-precipitation.
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Book chapters on the topic "Hopcalite"

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Guo, Yafei, Chuanwen Zhao, Changhai Li, and Shouxiang Lu. "Low-Temperature CO Catalytic Oxidation over KOH-Hopcalite Mixtures and In Situ CO2 Capture from Fire Smoke." In Fire Science and Technology 2015, 725–33. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0376-9_74.

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Buciuman, F. C., F. Patcas, and T. Hahn. "Synergy effect between copper and manganese oxides in hopcalite catalysts." In Spillover and Mobility of Species on Solid Surfaces, 315–22. Elsevier, 2001. http://dx.doi.org/10.1016/s0167-2991(01)80044-6.

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Conference papers on the topic "Hopcalite"

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Pasternack, Louise, Jane K. Rice, and Alan D. McCarrick. "Performance Variation in Hopcalite Catalysts." In International Conference On Environmental Systems. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1997. http://dx.doi.org/10.4271/972394.

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McCarrick, Alan D., and Stanley A. Jastrzebski. "Models for the Relative Activity of Hopcalite Catalyst Toward Various Organic Species." In International Conference on Environmental Systems. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1995. http://dx.doi.org/10.4271/951658.

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Journal articles
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