Characterization and Hydrogenation Activity of Ni/Si(Al)- MCM-41 Catalysts Prepared by Deposition−Precipitation

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• 作者：Rubn Nares ; Jorge Ramrez ; Ada Gutirrez-Alejandre ; Rogelio Cuevas
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2009
• 出版时间：February 4, 2009
• 年：2009
• 卷：48
• 期：3
• 页码：1154-1162
• 全文大小：250K
• 年卷期：v.48,no.3(February 4, 2009)
• ISSN：1520-5045

文摘

The deposition−precipitation (DP) method was used for the preparation of Ni/SiMCM-41 and Ni/AlMCM-41 catalysts with different DP times (1−4 h), and the catalysts were characterized by BET, XRD, TPR, FTIR spectroscopy, and TEM. On both types of catalysts, the Ni(II) phases formed are a mixture of 1:1 nickel phyllosilicate and Ni(OH)₂. The quantity of each phase at the end of the deposition process determines the final Ni particle size; i.e., greater amounts of Ni(OH)₂ lead to larger Ni particles. In addition, it was found that the presence of aluminum in the framework of MCM-41 delays the formation of the nickel hydrosilicate phase. As a result of the consumption of the siliceous pore walls during DP, the long-range order of the MCM-41 hexagonal pore structure is gradually lost. Catalytic activity in the hydrogenation of naphthalene was higher for Ni/SiMCM-41 catalysts and was a linear function of the exposed area of Ni particles.