Isolation of Pd atoms by Cu for semi-hydrogenation of acetylene: Effects of Cu loading
Isolation of Pd atoms by Cu for semi-hydrogenation of acetylene: Effects of Cu loading
复制标题
Cu 分离 Pd 原子用于乙炔半氢化：Cu 负载量的影响
DOI：
10.1016/s1872-2067(17)62847-x
复制
发表时间：
2017-09-01
影响因子：
16.5
通讯作者：
Zhang, Tao
中科院分区：
文献类型：
--
作者：
Pei, Guangxian;Liu, Xiaoyan;Zhang, Tao
铜合金化的Pd单原子催化剂对乙炔的半加氢反应表现出良好的催化性能，但形成合金化Pd单原子催化剂的铜/钯原子比的界限并不明确。本文采用等湿共浸渍法制备了固定钯含量、不同铜负载量的二氧化硅负载铜钯双金属催化剂。X-射线吸收光谱结果表明，Pd在250℃还原后与铜形成合金，当Cu/Pd原子比为40/1时，Pd原子被铜完全隔离。值得注意的是，将还原温度从250℃提高到400℃，对催化剂的催化性能几乎没有影响。这一发现可以归因于X射线吸收光谱结果显示的Pd所处的相似化学环境。(C)2017年，中国科学院大连化学物理研究所。
Cu-alloyed Pd single-atom catalysts exhibit excellent catalytic performance for the semi-hydrogenation of acetylene; however, the limit of the Cu/Pd atomic ratio for forming the alloyed Pd single-atom catalyst is ambiguous. Herein, silica-supported Cu-Pd bimetallic catalysts with fixed Pd content and varied Cu loadings were synthesized using an incipient wetness co-impregnation method. The X-ray absorption spectroscopy results indicated that Pd formed an alloy with Cu after reduction at 250 degrees C and that the Pd atoms were completely isolated by Cu for Cu/Pd atomic ratios 40/1. Notably, increasing the reduction temperature from 250 to 400 degrees C hardly affected the catalytic performances of the Cu-Pd/SiO2 catalysts. This finding can be attributed to the similar chemical environments of Pd demonstrated by the X-ray absorption spectroscopy results. (C) 2017, Dalian Institute of Chemical Physics, Chinese Academy of Sciences.