Alumina-doped Pt/WOx/ZrO2 catalysts for n-heptane isomerization

被引：37

作者：

Hua, WM ^{[1
]}

Sommer, J ^{[1
]}

机构：

[1] Univ Strasbourg, Lab Physico Chim Hydrocarbures, UMR 7513, Inst Chim, F-67070 Strasbourg, France

来源：

APPLIED CATALYSIS A-GENERAL | 2002年 / 232卷 / 1-2期

关键词：

isomerization of n-heptane; alumina-doped Pt/WZ; strong acids; H/D exchange;

D O I：

10.1016/S0926-860X(02)00087-X

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：

n-Heptane isomerization over Al2O3-doped Pt/WOx/ZrO2 (Pt/WZA) in comparison with PL/WOx/ZrO2 (Pt/WZ) was studied in the presence of H-2 at 200 degreesC. Higher isomerization selectivity was observed for these catalysts. The catalytic activity depends strongly on surface WOx loading and calcination temperature of WOx/Al2O3-ZrO2 (WZA) and WOx/ZrO2 (WZ) supports. The maximum activity for both Pt/WZA and Pt/WZ catalysts occurs at a WOx concentration of 10 wt.% W which is slightly higher than the theoretical monolayer capacities of WZA and WZ supports calcined at 800degreesC. Pt/WZA catalyst exhibits the higher maximum activity than Pt/WZ. The loss in activity observed at high H-2 pretreatment temperatures appears to be due to the strong interaction between Pt and reduced WOx species. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：129 / 135

页数：7

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