Ceria supported nickel catalysts for CO removal from H2-rich gas

CO in H2-rich gas must be removed to meet various requirements in industrial applications. Four methods, i.e., the precipitation method using aqueous ammonia, the complexing method using urea, the complexing method using citric acid and the precipitation method using ammonium carbonate, were adopted...

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Published inJournal of rare earths Vol. 34; no. 12; pp. 1213 - 1220
Main Author 高志明 代倩子 马宏伟 李展平
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.12.2016
Subjects
adsorption
ceria
chlorine doping
CO selective methanation
CO2
nickel
rare earths
富氢气体
尿素络合法
氧化铈
氨水沉淀法
甲烷化反应
负载
镍催化剂
nickel
adsorption
ceria
chlorine doping
CO selective methanation
rare earths
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Summary:CO in H2-rich gas must be removed to meet various requirements in industrial applications. Four methods, i.e., the precipitation method using aqueous ammonia, the complexing method using urea, the complexing method using citric acid and the precipitation method using ammonium carbonate, were adopted to prepare samples NiO/CeO2 as catalyst precursors for removal of CO from H2-rich gas via selective methanation reaction. The sample NiO/CeO2 prepared by the precipitation method using aqueous ammonia as precipitant exhibited the highest catalytic activity both for CO methanation and for CO2 methanation after reduction prior to the catalytic reaction. Chlorine ion was then doped to suppress CO2 conversion. Effect of chlorine doping was investigated. Over the optimal catalyst 40%Ni（Cl（0.2））/CeO2, CO in the H2-rich gas was removed to below 10 ppm with selectivity of 60% or higher at reaction temperatures 230–250 ℃ in the test period of 75 h.
Bibliography:11-2788/TF
CO in H2-rich gas must be removed to meet various requirements in industrial applications. Four methods, i.e., the precipitation method using aqueous ammonia, the complexing method using urea, the complexing method using citric acid and the precipitation method using ammonium carbonate, were adopted to prepare samples NiO/CeO2 as catalyst precursors for removal of CO from H2-rich gas via selective methanation reaction. The sample NiO/CeO2 prepared by the precipitation method using aqueous ammonia as precipitant exhibited the highest catalytic activity both for CO methanation and for CO2 methanation after reduction prior to the catalytic reaction. Chlorine ion was then doped to suppress CO2 conversion. Effect of chlorine doping was investigated. Over the optimal catalyst 40%Ni（Cl（0.2））/CeO2, CO in the H2-rich gas was removed to below 10 ppm with selectivity of 60% or higher at reaction temperatures 230–250 ℃ in the test period of 75 h.
CO selective methanation; nickel; ceria; chlorine doping; adsorption; rare earths
GAO Zhiming,DAI Qianzi,MA Hongwei,LI Zhanping （1. School of Chemistry; Beijing btstitute of Technology, Beijing 102488, China; 2. Analysis Center; Tsinghua University, Beijing 100084, China）
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(16)60156-4