Deactivation of supported nickel catalysts during CO methanation

被引：46

作者：

Barrientos, J. ^{[1
]}

Lualdi, M. ^{[1
]}

Boutonnet, M. ^{[1
]}

Jaras, S. ^{[1
]}

机构：

[1] KTH Royal Inst Technol, Chem Technol, S-10044 Stockholm, Sweden

来源：

APPLIED CATALYSIS A-GENERAL | 2014年 / 486卷

关键词：

Methanation; Deactivation; Support; Titania; Carbon formation; FISCHER-TROPSCH SYNTHESIS; NATURAL-GAS SNG; NI CRYSTAL SIZE; H2-CO MIXTURES; GROUP-8; METALS; CARBON-MONOXIDE; COBALT CATALYSTS; PARTICLE-SIZE; HYDROCARBONS; TITANIA;

D O I：

10.1016/j.apcata.2014.08.021

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：

Deactivation of Ni-based catalysts was investigated during CO methanation over different supported catalysts. X-ray diffraction and temperature-programmed hydrogenation analyses were used to investigate nickel particle sintering and carbon formation during the first 24 h on stream. Titania-supported catalysts presented high resistance towards carbon deposition and nickel particle growth in comparison with the other tested catalysts. Particle size effects on these two deactivation causes were also evaluated. It was shown that carbon formation rates are higher on bigger crystal particles. However, it was found that titania-supported nickel catalysts reduced at high temperatures show the opposite effect. This difference is most probably due to a stronger interaction between nickel and TiOx (x < 2) species on smaller crystals which changes the CO dissociation properties and, in consequence, carbon formation rates. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：143 / 149

页数：7