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Exploring the Influence of Pd Species Valence State and Chemisorbed Oxygen Concentration on the Catalytic Oxidation Performance of Toluene
Catalysis Surveys from Asia ( IF 3 ) Pub Date : 2019-04-09 , DOI: 10.1007/s10563-019-09273-5
Weiliang Han , Fang Dong , Haijun Zhao , Guodong Zhang , Zhicheng Tang

The valence state of Pd and chemisorbed oxygen were important factors for catalytic oxidation of toluene. The valence of Pd and chemisorbed oxygen could be adjusted by preparation method. In this paper, a series of Pd/Ce-Zr-Ox (PdCZ-Ox) catalysts were prepared by impregnation (PdCZ-Ox-IM), co-precipitation (PdCZ-Ox-CP), sol–gel (PdCZ-Ox-SG) and hydrothermal (PdCZ-Ox-HT) method, respectively, which could cause the structure alteration of PdCZ-Ox catalysts. These catalysts exhibited a great diverse in catalytic oxidation of toluene reaction due to the structure alteration of PdCZ-Ox catalysts. Through systematic analysis, PdCZ-Ox-CP exhibited higher catalytic performance of toluene oxidation than the other three PdCZ-Ox catalysts, which was attributed to the valence of Pd and the concentration of surface chemisorbed oxygen. The stability of PdCZ-Ox-CP was explored by three consecutives runs, thermal stability and moisture resistance tests. The PdCZ-Ox-CP possessed the good repeatability at three consecutives runs, superior moisture resistance, and the excellent stability.



中文翻译:

探索Pd的价态和化学吸附的氧浓度对甲苯催化氧化性能的影响

Pd和化学吸附的氧的价态是甲苯催化氧化的重要因素。钯和化学吸附氧的化合价可通过制备方法调节。本文通过浸渍(PdCZ-Ox-IM),共沉淀(PdCZ-Ox-CP),溶胶-凝胶(PdCZ-Ox)制备了一系列Pd / Ce-Zr-Ox(PdCZ-Ox)催化剂。 -SG法和水热法(PdCZ-Ox-HT),可能会导致PdCZ-Ox催化剂的结构发生变化。由于PdCZ-Ox催化剂的结构改变,这些催化剂在甲苯反应的催化氧化方面表现出极大的多样性。通过系统分析,PdCZ-Ox-CP表现出比其他三种PdCZ-Ox催化剂更高的甲苯氧化催化性能,这归因于Pd的化合价和表面化学吸附氧的浓度。PdCZ-Ox-CP的稳定性通过连续三轮运行,热稳定性和耐湿性测试进行了探索。PdCZ-Ox-CP在三个连续运行中具有良好的可重复性,优异的耐湿性和出色的稳定性。

更新日期:2019-04-09
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