The conversion of isobutane on silica-supported 12-tungstophosphoric and 12-molybdophosphoric acids: a reflection of their acidities

The conversion of isobutane and the selectivities to products are studied on silica-supported 12-tungstophosphoric acid (H 3PW 12O 40, abbreviated as HPW) and 12-molybdophosphoric acid (H 3PMo 12O 40, abbreviated as HPMo) for various loadings, reaction temperatures, contact times and times-on-stream...

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Bibliographic Details
Published in:Applied catalysis. A, General General, 2002-04, Vol.229 (1), p.245-250
Main Authors: Gao, S., Moffat, J.B.
Format: Article
Language:English
Subjects:
Catalysis
Catalytic reactions
Chemistry
Conversion
Exact sciences and technology
General and physical chemistry
Heteropoly acids
Isobutane
Molybdophosphoric acid
Selectivity
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Tungstophosphoric acid
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Summary:The conversion of isobutane and the selectivities to products are studied on silica-supported 12-tungstophosphoric acid (H 3PW 12O 40, abbreviated as HPW) and 12-molybdophosphoric acid (H 3PMo 12O 40, abbreviated as HPMo) for various loadings, reaction temperatures, contact times and times-on-stream. The conversions and selectivity patterns are markedly dissimilar for the two acids with carbenium ion and hydride transfer processes catalyzed on the former at temperatures as low as 200 °C but not on the latter, a reflection of the stronger acidic sites on the tungsten-containing acid than on 12-molybdophosphoric acid.
ISSN:0926-860X
1873-3875
DOI:10.1016/S0926-860X(02)00032-7