In situ investigation of active sites in zirconia-supported chromium oxide catalysts during the aromatization of n-octane

被引：34

作者：

Brückner, A ^{[1
]}

Radnik, J ^{[1
]}

Hoang, DL ^{[1
]}

Lieske, H ^{[1
]}

机构：

[1] Inst Angew Chem Berlin Adlershof eV, D-12484 Berlin, Germany

来源：

CATALYSIS LETTERS | 1999年 / 60卷 / 04期

关键词：

in situ EPR; chromium oxide catalysts; n-octane aromatization; catalyst deactivation; coke deposition;

D O I：

10.1023/A:1019067309929

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：

Supported chromium oxide catalysts containing 0.5 and 4.0 wt% Cr, respectively, on a 7 wt% La2O3/ZrO2 carrier were studied by in situ EPR equipped with on-line GC during the catalyst pretreatment in flowing H-2 and the aromatization of n-octane in the range 293 < T < 823 K. Active catalysts contain almost exclusively Cr3+ in the form of Cr2O3 clusters and isolated, coordinatively unsaturated Cr3+ species on the surface. The latter appear to be less sensitive to poisoning by coke deposition and govern residual catalytic activity.

引用

页码：183 / 189

页数：7

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