通过氢气还原，氧化锌作为金属催化剂载体的流失。
The loss of ZnO as the support for metal catalysts by H reduction.
作者信息
Qi Jingbo, Hu Xun
机构信息
College of Chemistry Chemical Engineering and Material Science, Zaozhuang University, Zaozhuang, Shandong 277160, China.
School of Material Science and Engineering, University of Jinan, Jinan, Shandong 250022, China.
出版信息
Phys Chem Chem Phys. 2020 Feb 19;22(7):3953-3958. doi: 10.1039/c9cp06093f.
The reduction of ZnO in a ZnO-supported catalyst to metallic zinc, the alloying of metallic zinc with a second metal and the evaporation of zinc species in a reductive atmosphere of hydrogen was investigated in this study. The results show that the reduction temperature was the determining factor for the transformation of zinc species. The complete removal of ZnO in a ZnO-supported catalyst can be achieved at 700 °C. The effects of different metals supported on ZnO on the transformation of ZnO were also investigated. Cu, Co and Ni species can slow the ZnO loss due to the priority for the reduction of these metal oxides and the formation of metal-Zn intermetallics. Fe based catalysts noticeably accelerated the loss of ZnO, which can be ascribed to the high oxophilicity of Fe and the strong interactions between the metal and support.
本研究考察了负载型氧化锌催化剂中氧化锌还原为金属锌、金属锌与第二种金属合金化以及在氢气还原气氛中锌物种的蒸发情况。结果表明，还原温度是锌物种转化的决定因素。在700℃时，负载型氧化锌催化剂中的氧化锌可完全去除。还研究了负载在氧化锌上的不同金属对氧化锌转化的影响。铜、钴和镍物种可减缓氧化锌的损失，这归因于这些金属氧化物优先被还原以及金属-锌金属间化合物的形成。铁基催化剂显著加速了氧化锌的损失，这可归因于铁的高亲氧性以及金属与载体之间的强相互作用。
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