Ethanol steam reforming using Ni(II)-Al(III) layered double hydroxide as catalyst precursor Kinetic study

被引：87

作者：

Veronica, Mas ^{[1
]}

Graciela, Baronetti ^{[1
]}

Norma, Amadeo ^{[1
]}

Miguel, Laborde ^{[1
]}

机构：

[1] Univ Buenos Aires, Fac Ingn, Dept Ingn Quim, Lab Proc Catalit, RA-1428 Buenos Aires, DF, Argentina

来源：

CHEMICAL ENGINEERING JOURNAL | 2008年 / 138卷 / 1-3期

关键词：

hydrogen; bioethanol; steam reforming; HDL Ni(II)Al(III); kinetic;

D O I：

10.1016/j.cej.2007.08.035

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A preliminary kinetic study of ethanol steam reforming using a Ni(II)-Al(III) lamellar double hydroxide (LDH) as catalyst precursor is carried out within the region of kinetic rate control. Ni(II)AI(III) precursor is synthesized by means of homogeneous precipitation by urea. Under highly diluted feed conditions used in the kinetic experiments, products obtained are H-2, CO, CO2 and traces of CH4. A parallel kinetic set is capable to describe the product distribution obtained. Assuming power law, kinetic parameters were fitted for both reactions involved in an operation range where reaction rate was assumed to be independent of water concentration. Ethanol orders were found to be lower than 1. A maximum ethanol conversion was found as a function of water concentration in the feed. Experiences with different methane concentrations showed that ethanol conversion decreases when methane concentration increases. These results reveal the existence of competitiveness between both reactants and methane to be adsorbed in the same type of active site. In order to complete the kinetic study, the Langmuir Hinshelwood model is expected to apply. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：602 / 607

页数：6

共 25 条

[1] Kinetic modeling of hydrogen production by the catalytic reforming of crude ethanol over a co-precipitated Ni-Al2O3 catalyst in a packed bed tubular reactor [J].