Electrochemical promotion of bulk lattice-oxygen extraction for direct methane conversion to syngas in SOFCs with Ni-YSZ anodes

被引：12

作者：

Huang, Ta-Jen ^{[1
]}

Huang, Meng-Chin ^{[1
]}

机构：

[1] Natl Tsing Hua Univ, Dept Chem Engn, Hsinchu 300, Taiwan

来源：

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

关键词：

electrochemical promotion; bulk lattice-oxygen extraction; fuel-free current; methane oxidation; syngas generation; solid oxide fuel cell;

D O I：

10.1016/j.cej.2007.07.057

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A phenomenon of electrochemical promotion of lattice-oxygen extraction from the bulk phase of YSZ is observed during direct methane oxidation to generate syngas at 800 degrees C in solid oxide fuel cells (SOFCs) with Ni-YSZ (yuria-stabilized zirconia) anodes. Markedly higher amount. of oxygen than that equivalent to the measured current is extracted for anodic oxidation. This promotion effect increases as the potential (voltage) increases. A phenomenon of "fuel-free current" is observed to be a consequence of this effect. The electrochemically promoted extraction of bulk lattice oxygen is influenced by both the operating condition and the reaction type. Both rate enhancement ratios of CO and CO2 formations are linearly related to the measured current density but inversely linearly related to the voltage. As the current density increases, both methane conversion and CO selectivity increase. Electrochemical promotion of bulk lattice-oxygen extraction enhances the syngas generation. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：538 / 547

页数：10

共 31 条

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