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

被引：8

作者：

Gao, S

Moffat, JB ^{[1
]}

机构：

[1] Univ Waterloo, Dept Chem, Waterloo, ON N2L 3G1, Canada

[2] Univ Waterloo, Guelph Waterloo Ctr Grad Work Chem & Biochem, Waterloo, ON N2L 3G1, Canada

来源：

APPLIED CATALYSIS A-GENERAL | 2002年 / 229卷 / 1-2期

基金：

加拿大自然科学与工程研究理事会;

关键词：

conversion selectivity; isobutane; heteropoly acids; tungstophosphoric acid; molybdophosphoric;

D O I：

10.1016/S0926-860X(02)00032-7

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The conversion of isobutane and the selectivities to products are studied on silica-supported 12-tungstophosphoric acid (H(3)PW(12)O(40), abbreviated as HPW) and 12-molybdophosphoric acid (H(3)PMo(12)O(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 degreesC but not on the latter, a reflection of the stronger acidic sites on the tungsten-containing acid than on 12-molybdophosphoric acid. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：245 / 250

页数：6

共 23 条

[1] CONTRIBUTION TO THE UNDERSTANDING OF THE REACTION CHEMISTRY OF ISOBUTANE AND NEOPENTANE OVER ACID CATALYSTS, .1. [J].

ENGELHARDT, J ;

HALL, WK .

JOURNAL OF CATALYSIS, 1990, 125 (02) :472-487

[2] PECULIARITIES OBSERVED IN H-D EXCHANGE BETWEEN PERDEUTERIOISOBUTANE AND H-ZEOLITES [J].

ENGELHARDT, J ;

HALL, WK .

JOURNAL OF CATALYSIS, 1995, 151 (01) :1-9

[3] Induced catalytic activity of fluorided alumina in the reactions of isobutane [J].

Engelhardt, J ;

Onyestyak, G ;

Hall, WK .

JOURNAL OF CATALYSIS, 1995, 157 (02) :721-729

[4] AN INFRARED-SPECTROSCOPY STUDY OF 1-BUTENE AND ITS ISOMERS ADSORBED ONTO 12-TUNGSTOPHOSPHORIC ACID SIO2 [J].

GAO, S ;

MOFFAT, JB .

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 1995, 105 (01) :133-142

[5] Isomerization of 1-butene on supported and unsupported metal-oxygen cluster compounds (heteropoly oxometalates) [J].

Gao, S ;

Moffat, JB .

CATALYSIS LETTERS, 1996, 42 (1-2) :105-111

[6] Ring-expansion of methylcyclopentane to cyclohexane and ring-contraction of cyclohexane to methylcyclopentane on silica-supported 12-tungstophosphoric acid and stoichiometric and nonstoichiometric microporous silver 12-tungstophosphate [J].

Gao, SQ ;

Rhodes, C ;

Moffat, JB .

CATALYSIS LETTERS, 1998, 55 (3-4) :183-188

[7] THE MECHANISM OF ISOBUTANE CRACKING OVER AMORPHOUS AND CRYSTALLINE SILICOALUMINATES - REPLY [J].

HALL, WK ;

LOMBARDO, EA ;

ENGELHARDT, J .

JOURNAL OF CATALYSIS, 1989, 115 (02) :611-615

[8] CHARACTERIZATION OF SORBED INTERMEDIATES AND IMPLICATIONS FOR THE MECHANISM OF CHAIN GROWTH IN THE CONVERSION OF METHANOL AND ETHANOL TO HYDROCARBONS OVER 12-TUNGSTOPHOSPHORIC ACID USING INFRARED PHOTOACOUSTIC-SPECTROSCOPY [J].

HIGHFIELD, JG ;

MOFFAT, JB .

JOURNAL OF CATALYSIS, 1986, 98 (02) :245-258

[9] ELUCIDATION OF THE MECHANISM OF DEHYDRATION OF METHANOL OVER 12-TUNGSTOPHOSPHORIC ACID USING INFRARED PHOTOACOUSTIC-SPECTROSCOPY [J].

HIGHFIELD, JG ;

MOFFAT, JB .

JOURNAL OF CATALYSIS, 1985, 95 (01) :108-119

[10] THE OXIDATION OF METHANE ON HETEROPOLYOXOMETALATES .1. CATALYTIC PROPERTIES OF SILICA-SUPPORTED HETEROPOLYACIDS [J].

KASZTELAN, S ;

MOFFAT, JB .

JOURNAL OF CATALYSIS, 1987, 106 (02) :512-524

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