Influence of support and kind of VOx species on isobutene selectivity and coke deposition in non-oxidative dehydrogenation of isobutane

被引：64

作者：

Rodemerck, Uwe ^{[1
]}

Sokolov, Sergey ^{[1
]}

Stoyanova, Mariana ^{[1
]}

Bentrup, Ursula ^{[1
]}

Linke, David ^{[1
]}

Kondratenko, Evgenii V. ^{[1
]}

机构：

[1] Univ Rostock, Leibniz Inst Katalyse eV, Albert Einstein Str 29A, D-18059 Rostock, Germany

来源：

JOURNAL OF CATALYSIS | 2016年 / 338卷

关键词：

Isobutane dehydrogenation; Supported vanadia catalysts; Surface acidity; Isomerization; Deactivation; Coke formation; VANADIUM-OXIDE CATALYSTS; PROPANE DEHYDROGENATION; OXIDATIVE DEHYDROGENATION; METAL-OXIDES; ALUMINA; VO(ACAC)(2); SILICA; REACTIVITY; STABILITY; ALKANES;

D O I：

10.1016/j.jcat.2016.03.003

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：

Non-oxidative dehydrogenation of isobutane was investigated over VOx/MCM-41, VOx/Al2O3 and VOx/SiO2-Al2O3 (1-70 wt.% SiO2). The highest selectivity to isobutene of around 85% at isobutane conversion of 50% was achieved over VOx/Al2O3, while all other catalysts were significantly less selective and performed similarly to each other. The lower selectivity obtained on VOx/MCM-41 and VOx/SiO2-Al2O3 is related to their higher activity for isomerization of isobutene to n-butenes as concluded from the results of separate tests with these olefins used as feed components. Our characterization studies suggest that the above isomerization reaction is catalyzed by both, Lewis acidic sites of support and VOx species. Skeletal isomerization activity of the latter depends on their polymerization degree and indirectly affects coke formation because, in addition to isobutene, butadiene formed from n-butenes opens an additional pathway to carbon deposits. (C) 2016 Elsevier Inc. All rights reserved.

引用

页码：174 / 183

页数：10

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