Unique catalysis of Ni-Al hydrotalcite derived catalyst in CO2 methanation: cooperative effect between Ni nanoparticles and a basic support

被引：139

作者：

He, Lei ^{[1
]}

Lin, Qingquan ^{[1
]}

Liu, Yu ^{[1
]}

Huang, Yanqiang ^{[1
]}

机构：

[1] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Liaoning, Peoples R China

来源：

JOURNAL OF ENERGY CHEMISTRY | 2014年 / 23卷 / 05期

基金：

中国国家自然科学基金;

关键词：

CO2; methanation; hydrotalcite; Ni/Al2O3; basic support; Ni-O-Al; LAYERED DOUBLE HYDROXIDES; RICE HUSK ASH; CARBON-DIOXIDE; NI/AL2O3; CATALYSTS; NICKEL-CATALYSTS; HYDROGENATION; ALUMINA; ADSORPTION; CONVERSION; REMOVAL;

D O I：

10.1016/S2095-4956(14)60144-3

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Ni-Al hydrotalcite derived catalyst (Ni-Al2O3-HT) exhibited a narrow Ni particle-size distribution with an average particle size of 4.0 nm. Methanation of CO2 over this catalyst initiated at 225 degrees C and reached 82.5% CO2 conversion with 99.5% CH4 selectivity at 350 degrees C, which was much better than its impregnated counterpart. Characterizations by means of CO2 microcalorimetry and Al-27 NMR indicated that large amount of strong basic sites existed on Ni-Al2O3-HT, originated from the formation of Ni-O-Al structure. The existence of strong basic sites facilitated the activation of CO2 and consequently promoted the activity. The combination of highly dispersed Ni with strong basic support led to its unique and high efficiency for this reaction.

引用

页码：587 / 592

页数：6

共 36 条

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