Synergetic effect of Pd and Ag dispersed on Al2O3 in the selective hydrogenation of acetylene
Synergetic effect of Pd and Ag dispersed on Al2O3 in the selective hydrogenation of acetylene
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DOI：
10.1016/s0926-860x(99)00463-9
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发表时间：
2000-05
影响因子：
5.5
通讯作者：
Qianwen Zhang;Jia Li;Xin-Xin Liu-Xin;Qiming Zhu
中科院分区：
文献类型：
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作者：
Qianwen Zhang;Jia Li;Xin-Xin Liu-Xin;Qiming Zhu
本文报道了一种以Al_2 O_3为载体的钯-银合金催化剂用于乙炔选择加氢的研究。Pd-Ag催化剂的活性低于纯金属Pd催化剂。但Pd-Ag催化剂的选择性比Pd催化剂高，且受温度升高的影响较小。X射线衍射（XRD）分析表明，金属Pd和Ag在氧化铝表面形成了合金。X射线光电子能谱（XPS）分析表明，Pd-Ag合金的形成是Ag在表面的富集。氢吸附等温线、程序升温还原（TPR）和程序升温脱附（TPD）结果表明，Pd-Ag催化剂中的钯吸附了少量的氢，且脱附温度高于Pd催化剂。
An alloy of palladium and silver dispersed on Al2O3has been used for the selective hydrogenation of acetylene. The activity of Pd–Ag catalyst is lower than that of pure metal Pd catalyst. But the selectivity of Pd–Ag catalyst is higher and less impaired by temperature increase than that of Pd catalyst. X-ray diffraction (XRD) indicates that metal Pd and Ag can form an alloy on the surface of alumina. X-ray photoelectron spectroscopy (XPS) shows that the Pd–Ag alloy is formed with enrichment of Ag on the surface. Results of hydrogen adsorption isotherm, temperature-programmed reduction (TPR) and temperature-programmed desorption (TPD) reveal that the bulk of palladium of Pd–Ag catalyst adsorbed a small amount of hydrogen, which is desorbed at a higher temperature than that in the case of Pd catalyst.