A Study on n-Pentane Reactions over Peroxodisulfated Zirconia and Sulfated Zirconia Solid Superacid

Abstract

Abstract: n-Pentane reaction over S_22-₈2(PSZ) at an ambient temperature in the steady state system has been introduced in relation with the same reaction occurring over SO^2-4/ZrO₂(SZ). It can be concluded that both PSZ and SZ have two functions on n-pentane: isomerization and cracking. The products of the two reactions are i-pentane and i-butane respectively. The conversion of n-pentane isomerization and apparent reactive velocity constant lie mainly on the calcining temperature of each sample. The catalysis activity of PSZ is higher than that of SZ: the molar ratio of i-pentane over the former to that over the latter is 1.3/1 after 1 h reaction. The optimum calcining temperature of PSZ is 550 ℃, which is 50 ℃ lower than that of SZ. By means of S-content measurement, BET, XRD, FTIR and chemical analysis, the physical and chemical characteristics of S_22-₈2 can be attained. We draw a conclusion that PSZ has stronger Lewis acidic sites and more acid quantity than SZ from the results of the in situ FTIR and Pyridine-FTIR experiment.

Key words: Solid superacid, S_22-₈2, SO^2-4/ ZrO₂, n-Pentane, Isomerization, Cracking

CLC Number:

O643.1

TrendMD:

SONG Guo-Xin, WANG Lin, XUE Hua-Xin, ZHANG Li, CHEN Jian-Min. A Study on n-Pentane Reactions over Peroxodisulfated Zirconia and Sulfated Zirconia Solid Superacid[J]. Chem. J. Chinese Universities, 2003, 24(1): 130.

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A Study on n-Pentane Reactions over Peroxodisulfated Zirconia and Sulfated Zirconia Solid Superacid

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