Catalytic Properties of Chromium-Palladium Loaded Alumina in the Combustion of Methane in the Presence of Hydrogen Sulfide Full article
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Journal of the Chemical Society - Faraday Transactions (1990-1998, in 1999 become Physical Chemistry Chemical Physics)
ISSN: 0956-5000 |
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| Output data | Year: 1997, Volume: 93, Number: 12, Pages: 2217-2223 Pages count : 7 DOI: 10.1039/a700253j | ||||
| Tags | OXIDATION | ||||
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Abstract:
Impregnation of γ-Al 2 O 3 by chromium(III) ions leads to surface chromate species after calcination under oxygen at 773 K. This solid is very active in methane combustion, however selectivity towards CO 2 is not complete because some CO is also produced even in the presence of a large excess of oxygen. To prevent the formation of CO, subsequent ultra-low palladium deposition (0.05–0.2 wt% Pd) has been performed on the chromate supported alumina. In this case the activity is unchanged but full selectivity towards CO 2 is now observed. For this bimetallic catalyst, palladium is present in the form of large PdO particles, which do not participate in the conversion of methane to CO 2 , mainly due to their size, however, they promote the oxidation of CO to CO 2 . The presence of H 2 S in the feed leads to a severe deactivation of the Pd/Al 2 O 3 catalyst owing to the formation of sulfate groups at the surface of PdO particles. On the contrary, the activity of the Cr/Al 2 O 3 catalyst was not dramatically affected, but selectivity towards CO was strongly improved. In the presence of H 2 S the chromate groups of the Cr/Al 2 O 3 are reduced to Cr 3+ ions probably in the form of Cr 2 O 3 . For the mixed catalyst containing both palladium and chromium, H 2 S addition has a limited effect on the global catalytic activity, whereas the formation of CO is fully suppressed. An electronic interaction between chromium oxide and palladium oxide is postulated leading to a weakening of the Pd–S bond of the adsorbed sulfate.
Cite:
Khairulin S.
, Béguin B.
, Garbowski E.
, Primet M.
Catalytic Properties of Chromium-Palladium Loaded Alumina in the Combustion of Methane in the Presence of Hydrogen Sulfide
Journal of the Chemical Society - Faraday Transactions (1990-1998, in 1999 become Physical Chemistry Chemical Physics). 1997. V.93. N12. P.2217-2223. DOI: 10.1039/a700253j WOS Scopus РИНЦ ANCAN OpenAlex
Catalytic Properties of Chromium-Palladium Loaded Alumina in the Combustion of Methane in the Presence of Hydrogen Sulfide
Journal of the Chemical Society - Faraday Transactions (1990-1998, in 1999 become Physical Chemistry Chemical Physics). 1997. V.93. N12. P.2217-2223. DOI: 10.1039/a700253j WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Jan 10, 1997 |
| Published print: | Jun 21, 1997 |
Identifiers:
| Web of science: | WOS:A1997XH00400015 |
| Scopus: | 2-s2.0-33748592293 |
| Elibrary: | 13256891 |
| Chemical Abstracts: | 1997:439121 |
| Chemical Abstracts (print): | 127:123892 |
| OpenAlex: | W2045384666 |