Metallic Ni nanocatalyst in situ formed from LaNi5H5 toward efficient CO2 methanation

被引：21

作者：

Zhong, Dan ^{[1
]}

Ouyang, Liuzhang ^{[1
,4
]}

Liu, Jiangwen ^{[1
]}

Wang, Hui ^{[1
]}

Jia, Yi ^{[2
,3
,4
]}

Zhu, Min ^{[1
,4
]}

机构：

[1] South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510641, Guangdong, Peoples R China

[2] Griffith Univ, Sch Nat Sci, Nathan, Qld 4111, Australia

[3] Griffith Univ, Queensland Micro & Nanotechnol Ctr, Nathan, Qld 4111, Australia

[4] Joint Venture Griffith Univ & South China Univ Te, China Australia Joint Lab Energy & Environm Mat, Nathan, Qld 4111, Australia

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2019年 / 44卷 / 55期

基金：

中国国家自然科学基金;

关键词：

CO2; methanation; Ni catalyst; Metal hydride; LaNi5; CARBON-DIOXIDE; CATALYSTS; HYDROGENATION; REDUCTION; STORAGE;

D O I：

10.1016/j.ijhydene.2019.02.153

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

LaNi5 alloy can be utilized to directly store and release hydrogen in mild condition, thus it is considered as a long-term safe and stable solid-state hydrogen storage material. In this work, LaNi5H5 was used as the solid-state hydrogen source in the CO2 methanation reaction. Impressively, the carbon dioxide conversion can be achieved to nearly 100% under 3 MPa mixed gas at 200 degrees C. The microstructure and composition analysis results reveal that the high catalytic activity may originate from the promoted elementary steps over in situ formed metallic Ni nanoparticles during the CO2 methanation process. More importantly, as the lowered reaction temperature prevented the agglomeration of Ni nanoparticles, this catalyst exhibited durable stability with 99% conversion rate of CO2 retained after 400 h cycling test. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：29068 / 29074

页数：7

共 29 条

[1] METHANATION OF CARBON-DIOXIDE OVER LANI(4)X-TYPE INTERMETALLIC COMPOUNDS AS CATALYST PRECURSOR [J].