一锅法制备高活性高稳定性Ni-Nd-Al三元有序介孔甲烷化催化剂

doi:10.11949/j.issn.0438-1157.20170531

化工学报 ›› 2017, Vol. 68 ›› Issue (10): 3823-3831.DOI: 10.11949/j.issn.0438-1157.20170531

• 催化、动力学与反应器 • 上一篇下一篇

一锅法制备高活性高稳定性Ni-Nd-Al三元有序介孔甲烷化催化剂

庄嘉豪^1,2, 靳国静³, 古芳娜¹, 贾丽华³, 苏发兵¹

1 中国科学院过程工程研究所多相复杂系统国家重点实验室, 北京 100190;
2 中国科学院大学, 北京 100049;
3 齐齐哈尔大学化学与化学工程学院, 黑龙江齐齐哈尔 161006

收稿日期:2017-05-02 修回日期:2017-08-14 出版日期:2017-10-05 发布日期:2017-10-05
通讯作者: 古芳娜,fngu@ipe.ac.cn;贾丽华,jlh29@163.comn
基金资助:
国家自然科学基金项目（21476238）；国家重点基础研究发展计划项目（2014CB744306）；多相复杂系统国家重点实验室自主部署课题项目（MPCS-2015-A-06）。

One-pot synthesis of ternary Ni-Nd-Al ordered mesoporous methanation catalysts with enhanced activity and stability

ZHUANG Jiahao^1,2, JIN Guojing³, GU Fangna¹, JIA Lihua³, SU Fabing¹

1 State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, CAS, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 College of Chemistry and Chemical Engineering, Qiqihaer University, Qiqihaer 161006, Heilongjiang, China

Received:2017-05-02 Revised:2017-08-14 Online:2017-10-05 Published:2017-10-05
Supported by:
supported by the National Natural Science Foundation of China (21476238), the National Basic Research Program of China (2014CB744306) and the Fund of State Key Laboratory of Multiphase complex systems (MPCS-2015-A-06).

摘要/Abstract

摘要：

CO甲烷化在煤制天然气技术中起着重要作用，Ni基催化剂作为目前研究最多的甲烷化催化剂，仍存在低温活性差、高温易烧结和易积炭等问题。针对这些问题，采用改进的溶剂蒸发诱导自组装方法，设计制备了不同含量Nd物种修饰的Ni-Nd-Al三元有序介孔甲烷化催化剂。采用N₂-物理吸附、X射线衍射（XRD）、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）等分析方法对反应前后催化剂的结构和形貌进行了表征，并考察其CO甲烷化反应催化性能。结果表明，制备出的Ni-Nd-Al甲烷化催化剂均具有有序介孔结构，Ni和Nd物种均匀分布在孔道内。适量Nd物种的加入有助于减小Ni颗粒的尺寸，提高其分散度和对H₂的吸附能力，进而提升催化剂的活性。有序介孔结构的限域效应有助于提高催化剂抗烧结和抗积炭能力。

关键词: Ni基催化剂, 介孔结构, 制备, CO甲烷化, 活性, 稳定性

Abstract:

CO methanation plays an important role in production of synthetic natural gas from coal.Application of Ni-based catalysts was restricted due to poor activity at low temperature,coke forming and Ni particle sintering at high temperature.A series of Nd-decorated Ni-Nd-Al ordered mesoporous methanation catalysts were synthesized by improved solvent evaporation-induced self-assembly method,and their catalytic performances for CO methanation were investigated.N₂ adsorption,X-ray diffraction (XRD),X-ray photoelectron spectroscopy (XPS),field emission scanning electron microscopy (SEM),bright-field transmission electron microscopy (TEM) were used to characterize structure and morphology of both fresh and used catalysts.The results showed that all Ni-Nd-Al catalysts had ordered mesoporous structures,in which Ni particles were anchored but Nd species were dispersed in the ordered mesoporous alumina channels.Addition of appropriate Nd contributed to size reduction and dispersion improvement of Ni particles,and adsorption enhancement of H₂,such that catalytic performance was promoted.The confinement effect of ordered mesoporous channels attributed to better anti-coking and anti-sintering properties of catalysts.

Key words: nickel catalyst, mesoporous structure, preparation, CO methanation, reactivity, stability

中图分类号:

TQ426.94

庄嘉豪, 靳国静, 古芳娜, 贾丽华, 苏发兵. 一锅法制备高活性高稳定性Ni-Nd-Al三元有序介孔甲烷化催化剂[J]. 化工学报, 2017, 68(10): 3823-3831.

ZHUANG Jiahao, JIN Guojing, GU Fangna, JIA Lihua, SU Fabing. One-pot synthesis of ternary Ni-Nd-Al ordered mesoporous methanation catalysts with enhanced activity and stability[J]. CIESC Journal, 2017, 68(10): 3823-3831.

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一锅法制备高活性高稳定性Ni-Nd-Al三元有序介孔甲烷化催化剂

One-pot synthesis of ternary Ni-Nd-Al ordered mesoporous methanation catalysts with enhanced activity and stability

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