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Analysis of oxide and vanadate supports for catalytic hydrogen combustion: Kinetic and mechanistic investigations
Author(s) -
Deshpande Parag A.,
Polisetti Sneha,
Madras Giridhar
Publication year - 2012
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.12636
Subject(s) - cerium oxide , catalysis , chemistry , combustion , hydrogen , vanadate , x ray photoelectron spectroscopy , inorganic chemistry , oxide , cerium , reaction mechanism , adsorption , catalytic combustion , kinetic energy , chemical engineering , organic chemistry , engineering , physics , quantum mechanics
Combustion synthesized oxide and vanadate compounds (CeO 2 , Fe 2 O 3 , CeVO 4 , and FeVO 4 ) were tested for catalytic hydrogen combustion. The compounds were characterized by X‐ray diffraction and X‐ray photoelectron spectroscopy. All the four compounds showed good activity and stability for catalytic hydrogen combustion and more than 95% conversion was observed over all the compounds within 500°C. The mechanisms for the reaction over the different classes of compounds (cerium‐based and iron‐based compounds) were proposed on the basis of spectroscopic observations. The main difference in the mechanisms was in the nature of adsorption of H 2 over the sites. The elementary processes for the reaction were proposed, corresponding rate expressions were derived, and the rate parameters for the reaction were estimated using nonlinear regression. Langmuir‐Hinshelwood and Eley‐Rideal mechanisms were also tested for the reaction and the proposed mechanism was compared with these mechanisms. © 2011 American Institute of Chemical Engineers AIChE J, 2012