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Category :
Languages : en
Pages : 19
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Two catalysts (hopcalite and palladium) were tested for efficiency in promoting oxidation of carbon monoxide (CO). The catalysts were tested using air at 21000 per h to the minus 1 space velocity, 50% relative humidity, and various temperatures. The air was contaminated with approximately 100 ppm each of methane, dichlorofluoromethane (R-12), and dichlorotetrafluoroethane (R-114) in addition to approximately 5000 ppm of CO. Hopcalite was further tested under similar conditions except that the air was at 100% relative humidity. There is little difference in the efficiencies of hopcalite and palladium catalyst for oxidizing CO at 57 to 62 deg C; both are low. At 119 to 122 deg C, the palladium is more efficient than hopcalite. The simultaneous presence of three other contaminants decreased the efficiency of both hopcalite and palladium for oxidizing CO. With the hopcalite preheated to about 119 deg C, the heat of reaction is not sufficient to maintain the oxidation of CO under the conditions tested. The minimum temperature at which hopcalite and palladium catalysts will completely oxidize CO under the conditions tested is in the 70 to 100 deg C range.
Author:
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Category :
Languages : en
Pages : 28
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Four catalysts (hopcalite, Whetlerite, a supported palladium, and a supported platinum) were tested for efficiency in promoting the oxidation of carbon monoxide (CO). At room temperature and 50% RH, hopcalite has no catalytic capability and platinum has practically none. At room temperature and 15% RH, hopcalite is superior to platinum in catalyzing the oxidation of CO. Hopcalite is more efficient than either of the other three catalysts in the 52 to 66 C (125 to 150 F) temperature range at both humidities. Platinum and palladium are superior to both hopcalite and Whetlerite at both humidities in the 113 to 135 C (235 to 275 F) temperature range. Higher humidity decreases the CO-oxidizing capabilities of hopcalite and Whetlerite but does not do so for platinum and palladium. Whetlerite is in the lower-performing group of catalysts under all except one of the different conditions used in the tests. For the hopcalite, palladium, and platinum catalysts there is a temperature below 135 C (275 F) and above 68 C (155 F) at which CO can be oxidized efficiently.
Author: Dipankar Koley
Publisher:
ISBN:
Category : Carbon monoxide
Languages : en
Pages : 138
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Author: Avinash G. Mulay
Publisher:
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Category :
Languages : en
Pages : 154
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Author: Seung-Hoon Oh
Publisher:
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Category :
Languages : en
Pages :
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Stoichiometic oxygen concentration plays an important role during CO oxidation over palladium metal. For 1.0 % CO at 200 °C, Pd metal exhibits 100 % CO conversion with 0.51 % O2 in the feedstream. However, the same Pd powder exhibits only 45 % CO conversion with 0.47 % O2. CO oxidation catalytic enhancements from 5 to 100 % are found for a short time period over the temperature range of 185 to 200 °C. During feedstream bypass, the bicarbonate species dissociate into a hydroxyl group and a carbon dioxide molecule. XPS data indicate that a carbon C 1s peak due to bicarbonate is present during the bypass step. Hydrous palladium oxide (PdO. H2O) exhibits 100 % CO conversion even at room temperature. Existence of lattice water and its reaction with CO/O2 are believed to be the reason for the excellent CO oxidation activity.
Author: Society of Chemical Industry (Great Britain)
Publisher:
ISBN:
Category : Chemistry, Technical
Languages : en
Pages : 512
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Lists of members for 1882-1903 issued in v. 1-22, after which they were published separately (wanting in v. 6 and v. 21).
Author: Philippe Arpentinier
Publisher: Editions TECHNIP
ISBN: 9782710807773
Category : Science
Languages : en
Pages : 490
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Volume 1 covers the most important technological aspects of the use of molecular oxygen for catalytic oxidation reactions.Volume 2 addresses the safety issues associated with the use of oxygen in catalytic oxidation reactions.Contents Vol. 1: 1. Introduction. 2. Chemical-physical properties of molecular oxygen. 3. Oxygen production technologies. 4. Chemical fundamentals of oxidation reactions. 5. Reactor technologies for multiphase systems. 6. Liquid phase oxidations. 7. Gas phase selective oxidations. 8. Selective oxidation of paraffins. References. Index. Vol. 2: 9. Introduction to safety problems in the chemical industry. 10. Chemical aspects of combustion in the gaseous phase. 11. Homogeneous chemical explosions: autoignition or spontaneous ignition. 12. Deflagration or propagation of flame. 13. Conditions governing flame propagation capability. 14. Detonation in the gaseous phase. 15. Prevention of and protection against explosions. References. Index.
Author:
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Category : Aeronautics
Languages : en
Pages : 652
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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Mapin Navnitlal Desai
Publisher:
ISBN:
Category : Carbon monoxide
Languages : en
Pages :
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Author: Pantaleon Henriquez
Publisher:
ISBN:
Category : Carbon monoxide
Languages : en
Pages :
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