不同载体Ni基催化剂生物质热解气甲烷化反应性能

熊伟; 定明月; 涂军令; 陈伦刚; 王铁军; 张琦; 马隆龙

不同载体Ni基催化剂生物质热解气甲烷化反应性能

1.
中国科学院广州能源研究所可再生能源重点实验室, 广东广州 510640;
2.
中国科学院大学, 北京 100049

基金项目: 国家自然科学基金（U1362109，51206172）；国家重点基础研究发展规划（973计划，2013CB228105）；国家重大科学仪器设备开发专项（2012YQ16000704）。

详细信息

通讯作者:
王铁军（1972- ），研究员，Tel：020-87057751，E-mail：wangtj@ms.giec.ac.cn。

中图分类号: O643.3
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出版历程
- 收稿日期: 2014-03-04
- 修回日期: 2014-05-27
- 刊出日期: 2014-08-30

Methanation of biomass pyrolysis gas over Ni catalyst with different supports

1.
Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;
2.
University of Chinese Academy of Sciences, Beijing 100049, China

摘要

摘要: 采用浸渍法制备了Ni金属负载在不同载体（SiO₂、ZrO₂、CeO₂、Al₂O₃和Al₂O₃-CeO₂）表面形成的催化剂，研究了水蒸气和载体对生物质热解气甲烷化反应性能的影响。结果表明，随着水蒸气量的增加CO转化率逐渐增大，而甲烷选择性呈现先增加后降低的变化趋势，当n_water/n_gas比值为0.26时达到最大。载体Al₂O₃相比SiO₂、ZrO₂和CeO₂具有更大的比表面积和Ni金属分散度，促进了生物质热解气甲烷化反应活性和选择性。相比于Ni-Al₂O₃催化剂，Al₂O₃-CeO₂复合载体具有更多的镍金属负载量活性金属分散度，以及最好的低温甲烷化反应性能。在300 ℃的低温条件下，Ni-Al₂O₃-CeO₂催化剂的CO转化率达到97%，CH₄增长率达到110%。
- 生物质热解气 /
- 镍基催化剂 /
- 复合载体 /
- 甲烷化
Abstract: The supported Ni-based catalysts were prepared by impregnation method. Effects of different supports (SiO₂, ZrO₂, CeO₂, Al₂O₃ and Al₂O₃-CeO₂) and water vapour on catalyst microstructure and their performance in biomass pyrolysis gas methanation were investigated. The results indicated that CO conversion increased gradually, and the CH₄ selectivity increased firstly, and then decreased with the increase of adding water vapor amount. Compared to SiO₂, ZrO₂ and CeO₂, Al₂O₃ presented higher BET surface area and Ni metal dispersion, which promoted the activity and selectivity for biomass pyrolysis gas methanation. Furthermore, the Al₂O₃-CeO₂ modified Ni-based catalyst showed more nickel metal loading and active metal dispersion comparing to the Ni-Al₂O₃ catalyst, exhibiting more excellent methanation performances at lower temperature. CO conversion reached 97%, and CH₄ growth rate reached 110% over the Ni-Al₂O₃-CeO₂ catalyst at 300 ℃.
- biomass pyrolysis gas /
- Ni-based catalyst /
- composite supporters /
- methanation

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