Direct synthesis of hydrogen peroxide from hydrogen and oxygen over palladium catalyst supported on heteropolyacid-containing ordered mesoporous carbon
Direct synthesis of hydrogen peroxide from hydrogen and oxygen over palladium catalyst supported on heteropolyacid-containing ordered mesoporous carbon
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DOI：
10.1016/j.cattod.2016.10.008
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发表时间：
2016-10
期刊：
影响因子：
5.3
通讯作者：
Jong Won Lee;Jeong Kwon Kim;T. H. Kang;E. Lee;I. Song
中科院分区：
文献类型：
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作者：
Jong Won Lee;Jeong Kwon Kim;T. H. Kang;E. Lee;I. Song
通过改变有序介孔碳（OMC）的制备温度（T = 8、15、25、35和45 °C）制备了一系列负载于有序介孔碳（Pd/OMC-T）上的钯催化剂。在卤化物和酸添加剂的存在下，在Pd/OMC-T催化剂上的氢转化率和过氧化氢产率相对于制备温度显示火山形趋势。发现催化性能与钯的表面积密切相关。在尝试不使用酸添加剂的情况下，使用OMC-25作为载体，制备了具有不同HPA含量（X = 5、10、20、30和40重量%）的负载在含杂多酸（HPA）的有序介孔碳（Pd/OMC-XHPA）上的另一系列钯催化剂。过氧化氢的选择性和产量表现出火山形的趋势，相对于HPA含量。在一定HPA含量下，催化剂（Pd/OMC-20 HPA）的上级催化性能是由于HPA引入到催化剂的孔中，使催化剂具有较高的酸性。
A series of palladium catalysts supported on ordered mesoporous carbon (Pd/OMC-T) were prepared with a variation of preparation temperature (T = 8, 15, 25, 35, and 45 °C) of ordered mesoporous carbon (OMC). Conversion of hydrogen and yield for hydrogen peroxide over Pd/OMC-T catalysts showed volcano-shaped trends with respect of preparation temperature in the presence of halide and acid additives. The catalytic performance was found to be closely related to the palladium surface area. With an attempt not to use acid additive, another series of palladium catalysts supported on heteropolyacid (HPA)-containing ordered mesoporous carbon (Pd/OMC-XHPA) were prepared with a variation of HPA content (X = 5, 10, 20, 30, and 40 wt%) using OMC-25 as a support. Selectivity and yield for hydrogen peroxide showed volcano-shaped trends with respect to HPA content. The superior catalytic performance of the catalyst at a certain HPA content (Pd/OMC-20HPA) was attributed to its high acidity caused by introduction of HPA into the pores of the catalyst.