Hydrogenation of CO2 into hydrocarbons over bifunctional system Cu-ZnO/Al2O3 + HZSM-5: Effect of proximity between the acidic and methanol synthesis sites

被引：14

作者：

Ahouari, Hania ^{[1
]}

Soualah, Ahcene ^{[1
]}

Le Valant, Anthony ^{[2
]}

Pinard, Ludovic ^{[2
]}

Pouilloux, Yannick ^{[2
]}

机构：

[1] Univ Bejaia, Fac Sci Exactes, Lab Physicochim Mat & Catalyse, Bejaia 06000, Algeria

[2] Univ Poitiers, IC2MP, CNRS, UMR 7285, F-86022 Poitiers, France

来源：

COMPTES RENDUS CHIMIE | 2015年 / 18卷 / 12期

关键词：

CO2; Bifunctional catalysts; Hydrocarbons synthesis; Oxide-zeolite proximity; METHANOL SYNTHESIS CATALYST; CARBON-DIOXIDE; SELECTIVE SYNTHESIS; COMPOSITE CATALYST; TEMPERATURE; CONVERSION; REDUCTION; MECHANISM;

D O I：

10.1016/j.crci.2015.07.005

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A one-step CO2 hydrogenation reaction into hydrocarbons (HC) using a bifunctional system constituted by a methanol synthesis catalyst [Cu-ZnO-Al2O3 (CZA)] and a zeolite (HZSM-5) has been studied. The influence of the catalyst bed configuration on activity, selectivity, and HC yield has been evaluated. The results obtained at T-R = 6231<, P-R = 3.0 MPa and WHSV = 6000 h(-1) show that CO2 hydrogenation and hydrocarbon selectivity were strongly influenced by the proximity between oxide and zeolite, whatever the disposition of the two catalytic active sites. Indeed, the highest conversion and the best yield of hydrocarbons (mainly C-2) were obtained with the M1 bifunctional catalysts in which the oxide-zeolite proximity is the lowest. This is ascribed to the hydrogen spillover phenomenon, which does not promote the carbon chain growth. (C) 2015 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.

引用

页码：1264 / 1269

页数：6

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