Journal
CHEMICAL ENGINEERING JOURNAL
Volume 181, Issue -, Pages 677-684Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2011.12.056
Keywords
Supported nickel catalysts; Active metal surface area; Microcalorimetric adsorption; Surface acidity and basicity; Hydrogenation of lauronitrile
Categories
Funding
- NSFC [21073089, 20673055]
- Jiangsu Province of China [BE2009145]
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Supported nickel catalysts with different supports (MgO, SiO2, Al2O3, MgAlO and SiAlO) were prepared by the co-precipitation method and dried in n-butanol. Nickel was found to be relatively easier to reduce in Ni/MgO and Ni/SiO2 than in Ni/Al2O3, while nickel was higher dispersed in Ni/SiO2 than in Ni/Al2O3 and Ni/MgO. Thus, the reducibility and dispersion of nickel in Ni/MgAlO and Ni/SiAlO were significantly enhanced, leading to the high active nickel surface areas (75 m(2)/g-catalyst). Acetonitrile was found to be adsorbed on the reduced nickel and acidic sites. The strong surface basicity of Ni/MgO was found to favor the selectivity to the primary amine, but inhibited the conversion of lauronitrile. On the other hand, the conversion of lauronitrile was high over the Ni/SiO2. Ni/Al2O3 and Ni/SiAlO with strong surface acidity, but the selectivity to the prime amine was relatively low. The Ni/MgAlO with intermediate strengths of surface acidity and basicity exhibited the high conversion of lauronitrile and high selectivity to the prime amine. (C) 2011 Elsevier B.V. All rights reserved.
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