用乙酰丙酮钯作前驱物制备Pd/C催化剂的研究

Study on Preparation of Pd/C Catalyst with Palladium(Ⅱ)Acetylacetonate as Precursor

分别采用乙酰丙酮钯、氯化钯和硝酸钯作前驱物,用浸渍-还原法制备了一系列Pd/C催化剂,以松香歧化反应评价其活性,研究了活性炭类型、载体预处理、溶剂、还原方法及温度等因素对Pd/C催化剂活性的影响。结果表明,采用具有较大比表面积和孔容的活性炭作载体有利于钯在其表面的均匀分布和催化剂活性的提高;以Pd(acac)2作前驱体,以及使用极性较强的溶剂与用无机配合物前驱体相比,制备的Pd/C催化剂活性较高;TG-DTA分析表明Pd(acac)2在350℃下完全分解,基于此结果,作者在350℃条件下采用氢气干法还原,制备出活性略高于从日本进口的Pd/C催化剂。

A series of activated charcoal supported palladium catalysts was prepared by the impregnation-reduction method with Pd（acac）2, PdC12 and Pd（NO3）2 as precursors, respectively. The resin disproportionation was used to evaluate the catalytic activity. The effect of the type of activated charcoal, pretreatment of the support, solvent, reduction method and temperature on the catalytic activity of Pd/C were studied. The results showed that using activated charcoal with large specific area and pore capacity as the support is beneficial to homogeneous distribution of Pd particles on the surface, thus to promotion of catalytic activity; using Pd（acac）2 as precursor, and the solvent with strong polarity may raise catalytic activity of Pd/C compared with inorganic chemical precursors. And TG-DTA indicated that Pd（acac）2 could be completely decomposed at 350℃. Based on the results, by the method of hydrogen dry-reduction, the authors manufactured the Pd/C catalyst, the performance of which could be comparable to the similar product imported from Japan.