B2O3负载量对MoO3/CeO2-Al2O3耐硫甲烷化性能的影响

doi:10.11949/j.issn.0438-1157.20160317

化工学报 ›› 2016, Vol. 67 ›› Issue (9): 3672-3677.DOI: 10.11949/j.issn.0438-1157.20160317

• 催化、动力学与反应器 • 上一篇下一篇

B₂O₃负载量对MoO₃/CeO₂-Al₂O₃耐硫甲烷化性能的影响

刘震, 王保伟, 王玮涵, 孟大钧, 李振花, 马新宾

天津大学化工学院绿色合成与转化教育部重点实验室, 天津 300072

收稿日期:2016-03-18 修回日期:2016-05-09 出版日期:2016-09-05 发布日期:2016-09-05
通讯作者: 王保伟
基金资助:
国家高技术研究发展计划项目（2015AA050504）。

Impact of B₂O₃ loading on sulfur-resistant methanation activity of MoO₃/CeO₂-Al₂O₃ catalyst

LIU Zhen, WANG Baowei, WANG Weihan, MENG Dajun, LI Zhenhua, MA Xinbin

Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

Received:2016-03-18 Revised:2016-05-09 Online:2016-09-05 Published:2016-09-05
Supported by:
supported by the National High Technology Research and Development Program of China (2015AA050504).

摘要/Abstract

摘要：

考察B₂O₃负载量对于MoO₃/CeO₂-Al₂O₃催化剂对耐硫甲烷化活性的影响，利用BET、XRD、TEM、NH₃-TPD等手段对催化剂进行了表征。结果表明，催化剂的耐硫甲烷化活性随B₂O₃负载量增加呈现先升高后降低的变化规律；当B₂O₃负载量为0.5%时，催化剂的耐硫甲烷化活性最高，CO转化率达到55%。结合表征分析，发现添加B₂O₃会影响催化剂载体的结构和表面酸度，从而影响活性组分的分散程度，进而影响MoO₃/CeO₂-Al₂O₃催化剂的耐硫甲烷化性能。催化剂的晶化程度太高或单位面积上的强酸量太多均不利于甲烷化反应；较好的活性组分分散度有利于催化剂甲烷化活性的提高。

关键词: 催化剂, 甲烷化, 天然气, 酸改性, 氧化硼, 载体

Abstract:

Synthetic natural gas (SNG) production from coal is considered again due to rising prices for natural gas, the wish for less dependency from natural gas imports and the opportunity of reducing green house gases. The technical, economic and ecological feasibility of SNG with Mo-based catalysts showed water-gas shift and sulfur-resistant methanation has been studied. In this paper the impact of B₂O₃ loading on the MoO₃/CeO₂-Al₂O₃ catalysts for sulfur-resistant methanation was investigated. The catalysts were prepared by impregnation method and characterized by means of BET, XRD, TEM and NH₃-TPD. The results showed that the sulfur-resistant methanation activity of MoO₃/CeO₂-Al₂O₃ catalysts were increased at first and then decreased as the increase of B₂O₃ loading. The catalyst adding 0.5% B₂O₃ showed the highest activity and the conversion of CO was 55%. The characterization results indicated that the addition of B₂O₃ had influences on the structure and surface acidity of catalysts and the dispersion of active components, which further impacted the activity of catalysts. High-crystallization and enhancement of strong acid quantity were not beneficial to the sulfur-resistant methanation, while the high dispersion of active components was favorable to the improvement of the catalyst activity.

Key words: catalyst, methanation, natural gas, acid modification, B₂O₃, support

中图分类号:

TQ028.8

刘震, 王保伟, 王玮涵, 孟大钧, 李振花, 马新宾. B₂O₃负载量对MoO₃/CeO₂-Al₂O₃耐硫甲烷化性能的影响[J]. 化工学报, 2016, 67(9): 3672-3677.

LIU Zhen, WANG Baowei, WANG Weihan, MENG Dajun, LI Zhenhua, MA Xinbin. Impact of B₂O₃ loading on sulfur-resistant methanation activity of MoO₃/CeO₂-Al₂O₃ catalyst[J]. CIESC Journal, 2016, 67(9): 3672-3677.

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B₂O₃负载量对MoO₃/CeO₂-Al₂O₃耐硫甲烷化性能的影响

Impact of B₂O₃ loading on sulfur-resistant methanation activity of MoO₃/CeO₂-Al₂O₃ catalyst

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