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Effect of metal oxide composite method on catalytic oxidation performance and adsorption oxygen of aerogel supported Pd catalysts in oxidative carbonylation of phenol
Journal of Organometallic Chemistry ( IF 2.3 ) Pub Date : 2020-01-10 , DOI: 10.1016/j.jorganchem.2020.121110
Meng Peng , Chao Hong , Yuhai Huang , Ping Cheng , Hua Yuan

A series of metal manganese-cerium silicon composite aerogel supported Pd catalysts were prepared by the in-situ method, the precipitation method and the impregnation method. The catalysts were applied to synthesize diphenyl carbonate (DPC) by oxidative carbonylation. The effects of different preparation methods and composite metal oxide contents on catalytic activities were studied. The prepared catalysts were characterized by XRD, FTIR, BET, TEM, H2-TPR and XPS. The results showed that the metal composite method had a great influence on the catalyst particle size and specific surface area; the low temperature oxidation performance and surface oxygen species content of the catalysts prepared by different methods were different. The catalyst prepared by the impregnation method has a large specific surface area and particle size, good low-temperature oxidation performance and more surface adsorption oxygen, which helps to improve the multi-step electron transfer efficiency, to promote the regeneration of the active component Pd2+ and to increase catalytic activity.



中文翻译:

金属氧化物复合方法对气凝胶负载Pd催化剂催化苯酚氧化羰基化反应的影响

采用原位法,沉淀法和浸渍法制备了一系列金属锰-铈硅复合气凝胶负载的钯催化剂。将该催化剂用于通过氧化羰基化反应合成碳酸二苯酯(DPC)。研究了不同制备方法和复合金属氧化物含量对催化活性的影响。制备的催化剂通过XRD,FTIR,BET,TEM,H 2表征。-TPR和XPS。结果表明,金属复合法对催化剂的粒径和比表面积有较大影响。不同方法制备的催化剂的低温氧化性能和表面氧种类含量不同。通过浸渍法制备的催化剂具有大的比表面积和粒径,良好的低温氧化性能和更多的表面吸附氧,有助于提高多步电子转移效率,促进活性组分Pd的再生2+并增加催化活性。

更新日期:2020-01-11
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