Effect of Sn additives on the CuZnAl-HZSM-5 hybrid catalysts for the direct DME synthesis from syngas

被引：32

作者：

Cai, M. ^{[1
]}

Subramanian, V. ^{[1
]}

Sushkevich, V. V. ^{[2
]}

Ordomsky, V. V. ^{[1
]}

Khodakov, A. Y. ^{[1
]}

机构：

[1] Univ Lille 1, CNRS, Unite Catalyse & Chim Solide, ENSCL EC Lille,UMR 8181, F-59655 Villeneuve Dascq, France

[2] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119991, Russia

来源：

APPLIED CATALYSIS A-GENERAL | 2015年 / 502卷

关键词：

Selective poisoning; Tin; CuO-ZnO-Al2O3; catalyst; DME synthesis; DIMETHYL ETHER DME; GAS-SHIFT REACTION; METHANOL SYNTHESIS; SOLID-ACID; ALTERNATIVE FUEL; CARBON-MONOXIDE; DEHYDRATION; HYDROGENATION; CU/ZNO/AL2O3; CONVERSION;

D O I：

10.1016/j.apcata.2015.06.030

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：

Tin-promoted bifunctional Cu-Zn-Al/HZSM-5 catalysts were prepared in order to increase the selectivity of carbon monoxide hydrogenation to dimethyl ether (DME). The catalysts were characterized by H-2-TPR, in-situ XRD, XPS, in-situ XANES and FTIR. The characterization revealed that the electronic properties and surface distribution of Cu in the catalysts were significantly changed by tin addition leading to the decrease in the fraction of ionic Cu species (Cu+ and Cu2+) and positively charged metallic Cu delta+ sites. Addition of tin suppressed the water gas shift reaction and decreased the selectivity to undesirable CO2. As a result, the selectivity to valuable DME and methanol increased for the mildly promoted catalysts. Further increase in Sn loading led to the decrease in the overall rate of carbon monoxide conversion. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：370 / 379

页数：10

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