Ce含量对Ni-Ce/Al<sub>2</sub>O<sub>3</sub>催化剂结构及浆态床CO甲烷化性能的影响

孟凡会; 刘军; 李忠; 钟朋展; 郑华艳

Ce含量对Ni-Ce/Al₂O₃催化剂结构及浆态床CO甲烷化性能的影响

太原理工大学煤科学与技术教育部和山西省重点实验室, 山西太原 030024

基金项目: 国家重点基础研究发展规划（973计划，2012CB723105）；山西省青年科技研究基金（2013021007-4）；中国博士后科学研究基金（2013M541210）；太原理工大学校青年基金（2012L040）。

详细信息

通讯作者:
李忠，E-mail：lizhong@tyut.edu.cn；Tel/Fax：0351-6018526。

中图分类号: O643
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出版历程
- 收稿日期: 2013-07-03
- 修回日期: 2013-10-07
- 刊出日期: 2014-02-28

Effect of Ce content of Ni-Ce/Al₂O₃ catalyst on structure and CO methanation in slurry-bed reactor

Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, China

摘要

摘要: 以γ-Al₂O₃为载体，采用等体积浸渍法制备了不同Ce含量的Ni-Ce/Al₂O₃催化剂，并考察了其浆态床CO甲烷化反应性能。借助XRD、BET、H₂-TPR及CO-TPD等对催化剂进行了表征分析，研究了催化剂的微观结构与甲烷化性能之间的关系。结果表明，助剂Ce的引入能够加强Ni物种与载体之间的相互作用、增强活性组分Ni对CO的吸附能力。随着Ce含量的升高，Ni物种在载体表面的分散度提高、Ni晶粒粒径减小，催化剂的比表面积及与载体相互作用较强的β-NiO相对含量先升后降。催化剂的浆态床甲烷化活性随Ce含量的升高呈现规律性的变化，CO转化率和CH₄时空收率先增加后略有下降，当Ce含量为4%（质量分数）时，催化剂甲烷化活性最佳。
- 浆态床反应器 /
- CO甲烷化 /
- Ni-Ce/Al₂O₃催化剂 /
- 铈 /
- 氧化铝
Abstract: Ni-Ce/Al₂O₃ catalysts with different Ce contents were prepared by wet impregnation method using γ-Al₂O₃ as support, and their catalytic performance of CO methanation in slurry-bed reactor were evaluated. The catalysts were characterized with XRD, BET, H₂-TPR, CO-TPD, and the relationship between the microstructural properties of catalysts and CO methanation in slurry-bed reactor was investigated. The results indicated that the addition of Ce into Ni/Al₂O₃ catalyst strengthened the interaction between Ni species and the support and enhanced the CO adsorption. With the increase of Ce content, the dispersion of Ni species on support was improved, the particle size of nickel decreased, the specific surface area and the relative content of β-NiO with stronger interaction with support increased firstly and then decreased. The catalytic performance of CO methanation in slurry-bed changed regularly with the increase of Ce content, the conversion of CO and the space-time yield (STY) of CH₄ were all increased firstly and then decreased slightly. When the content of Ce reached 4%, the catalyst exhibited the best catalytic performance.
- slurry-bed reactor /
- CO methanation /
- Ni-Ce/Al₂O₃ catalyst /
- cerium /
- alumina

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