Sintering of alumina-supported nickel particles under amination conditions: Support effects

被引：30

作者：

Lif, Johan ^{[1
]}

Odenbrand, Ingemar

Skoglundh, Magnus

机构：

[1] Chalmers, Dept Chem & Biol Engn, S-41296 Gothenburg, Sweden

[2] Akzo Nobel Funct Chem AB, S-44485 Stenungsund, Sweden

[3] Lund Univ, Dept Chem Engn, LTH, S-22100 Lund, Sweden

来源：

APPLIED CATALYSIS A-GENERAL | 2007年 / 317卷 / 01期

关键词：

sintering; nickel; alumina; Lewis acids sites; coordination number; amination catalysis;

D O I：

10.1016/j.apcata.2006.10.003

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：

The sintering of alumina-supported nickel particles has been studied after heat-treatment in ammonia + hydrogen at 523 K and 250 bar. The investigated samples were nickel supported on gamma-alumina, transalumina and alpha-alumina, and co-precipitated nickel oxide-alumina. The sintering process was mainly followed by hydrogen chemisorption. The samples were also characterised by specific surface area measurements, X-ray diffraction, temperature programmed desorption of ammonia, in situ FTIR spectroscopy and temperature programmed reduction. For nickel supported on gamma-alumina, up to 40% of the initial metal surface area remained after the heat-treatment in ammonia + hydrogen compared with alpha-alumina or transalumina where only 10-20% of the initial metal surface area remained after the heat-treatment. The sintering can be correlated to the bond strength between the metal particle and the support. The larger the number of low-coordinated surface aluminium sites is, as for gamma-alumina, the stronger the metal-support interaction is and this in turn suppresses diffusion of nickel particles and/or atoms. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：62 / 69

页数：8

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