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首页> 外文期刊>Catalysis science & technology >Preparation of improved Ag-Pd/TiO2 catalysts using the combined strong electrostatic adsorption and electroless deposition methods for the selective hydrogenation of acetylene
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Preparation of improved Ag-Pd/TiO2 catalysts using the combined strong electrostatic adsorption and electroless deposition methods for the selective hydrogenation of acetylene

机译：准备提高Ag-Pd /二氧化钛催化剂使用合并后的静电吸附和强劲选择性化学沉积方法乙炔加氢的

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摘要

TiO2-supported Ag-Pd catalysts were prepared by strong electrostatic adsorption (SEA) of Pd followed by electroless deposition (ED) of Ag with incremental surface coverages of Ag (theta(Ag)) ranging from 0-0.92. Theoretical monolayer (ML) coverage values (theta(Theo)), assuming monodisperse deposition of Ag on Pd, were equal to experimental coverage values (theta(Expt)) up to approximately theta(Ag) = 0.7. Above this value, autocatalytic deposition of Ag on Ag occurred as well as further catalytic deposition of Ag on Pd. The atomic Pd/Ag compositions determined from transmission electron microscopy-energy dispersive X-ray spectroscopy (TEM-EDX) were in very good agreement with the values from atomic absorption spectroscopy (AAS), decreasing from 16.2 to 1.5 as theta(Ag) coverages increased from 0.36 to 0.92 ML. The selectivity of acetylene hydrogenation to ethylene and the turnover frequency for acetylene hydrogenation were maximized at the highest theta(Ag) in this study. The uniform deposition of Ag on the surfaces of small Pd particles using the combined methods of SEA and ED resulted in significant improvement of the bimetallic Ag-Pd surface for the selective hydrogenation of acetylene.
机译：TiO2-supported Ag-Pd催化剂所准备的强烈的Pd静电吸附(海)其次是化学沉积(ED) Ag)与增量表面保险Ag)(θ(Ag))从0 - 0.92。单层(ML)覆盖范围值(θ(西奥)),假设单分散沉积Pd Ag),等于实验报道值吗(θ(外贸))大约θ(Ag) =0.7. Ag)在Ag)发生以及进一步催化沉积在Pd Ag)。作品从传输电子microscopy-energy色散x射线光谱学(TEM-EDX)都很好协议从原子吸收的值光谱法(AAS),从16.2下降到1.5θ(Ag)保险从0.36增加到0.92毫升。乙炔的选择性乙烯加氢和营业额频率为乙炔加氢最大化在最高θ(Ag)在这项研究。Ag)的表面上均匀沉积小Pd粒子方法相结合的方法海洋和ED导致显著的改善双金属Ag-Pd表面选择性乙炔加氢。

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