文献类型：期刊文献

英文题名：Selective hydrogenation of phenylacetylene over a nano-Pd/α-Al2O3 catalyst

作者：Hu, Jiawei[1];Zhou, Zhiming[1];Zhang, Rui[2];Li, Li[3];Cheng, Zhenmin[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Engn Res Ctr Large Scale Reactor Engn & Technol, Minist Educ, Shanghai 200237, Peoples R China;[3]E China Univ Sci & Technol, Chem Engn Res Ctr, Shanghai 200237, Peoples R China

年份：2014

卷号：381

起止页码：61

外文期刊名：JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL

收录：;EI(收录号：20134616977607);WOS:【SCI-EXPANDED(收录号:WOS:000329384300009)】；

基金：Financial supports from the National Natural Science Foundation of China (No. 21276076), the Program for New Century Excellent Talents in University (No. NCET-13-0801), the Fundamental Research Funds for the Central Universities (No. 222201313011) and the "111" project (B08021) are greatly acknowledged.

语种：英文

外文关键词：Pd nanoparticles; Reduction-by-solvent; Selective hydrogenation; Phenylacetylene; Catalyst

摘要：Selective hydrogenation of phenylacetylene is an important reaction for increasing the purity of the styrene monomer. In this study a series of supported nano-Pd/alpha-Al2O3 catalysts were prepared and applied to the selective hydrogenation of phenylacetylene. The preparation procedure consisted of two steps: synthesis of colloidal Pd nanoparticles by a reduction-by-solvent method, followed by impregnation onto alpha-Al2O3. In the first step, NaBH4 was used as a reducing agent to reduce Pd2+ ions in the C2H5OH/H2O solvent system, and polyvinylpyrrolidone (PVP) was used as a protecting agent to stabilize Pd nanoparticles. The prepared colloids and catalysts were characterized by N-2 physisorption, CO chemisorption, XRD, UV-vis, FT-IR, ICP and HRTEM techniques. It was found that the amounts of NaBH4, C2H5OH and PVP had effects on the Pd particle size, which in turn influenced the catalyst performance. The selective hydrogenation of phenylacetylene was sensitive to the structure of the nano-Pd/alpha-Al2O3 catalysts. In the case where the Pd particle size varied from 3.8 to 6.6 nm, the specific activity and the selectivity to styrene increased with increasing particle size, but when the particle size increased in the range of 6.6-12.1 nm, the specific activity increased slowly and the selectivity to styrene decreased gradually. Nano-Pd/alpha-Al2O3 can be reused several times without loss of activity and selectivity and no distinct variation in the Pd particle size was observed, indicating its good stability in the selective hydrogenation of phenylacetylene. (C) 2013 Elsevier B.V. All rights reserved.