表面重构提高钯纳米片催化加氢性能  

Surface reconstruction to improve the catalytic hydrogenation performance of palladium nanosheets

作　　者：王元平[1] 赵文平[1] 石华[1] Wang Yuanping;Zhao Wenping;Shi Hua(China Tianchen Engineering Co.,Ltd.,Tianjin 300400,China)

机构地区：[1]中国天辰工程有限公司,天津300400

出　　处：《工业催化》2022年第9期50-55,共6页Industrial Catalysis

摘　　要：提高贵金属催化剂的活性是减少其用量、降低成本的关键。为通过构造结构缺陷提高钯纳米片(Pd NSs)的催化活性,将其乙醇分散液老化3天。用TEM、XRD和XPS对材料进行表征。结果表明,由于氧化刻蚀-重生长,Pd NSs发生表面重构,生成了表面粗糙、含有大量结构缺陷的表面重构Pd NSs(RPd NSs)。考察表面重构对RPd NS催化硝基苯和苯乙烯加氢性能的影响。结果表明,Pd NSs为催化剂时,硝基苯和苯乙烯的转化率分别为0%和46.1%。相同反应条件下,RPd NSs为催化剂时,硝基苯和苯乙烯完全转化。结构缺陷引起的大比表面积、高配位不饱和原子密度、优化的电子结构以及降低的氧化程度是表面重构提高RPd NSs催化活性的主要原因。Improving the activity of noble metal catalysts can reduce their dosage and costs.In order to improve the catalytic activity by construction of structural defects,palladium nanosheets(Pd NSs)in ethanol are aged for three days.The materials are characterized by TEM,XRD,and XPS.The results show that due to oxidative etching and regrowth,the surface of Pd NSs is reconstructed,and the surface reconstructed Pd NSs(RPd NSs)with rough surface and a large number of structural defects are generated.The effect of surface reconstruction on the catalytic performances of RPd NSs in nitrobenzene and styrene hydrogenation is investigated.When Pd NSs are used as the catalyst,the conversions of nitrobenzene and styrene are 0%and 46.1%,respectively.Under the same reaction conditions,both nitrobenzene and styrene are converted completely when RPd NSs are used as the catalyst.Larger specific surface area,higher coordination unsaturated atomic density,optimized electronic structure and reduced oxidation degree induced by structural defects are the main reasons for catalytic activity improving of RPd NSs through surface reconstruction.

关 键 词：催化剂工程 钯纳米片 表面重构 缺陷 催化加氢 硝基苯 苯乙烯 

分 类 号：TQ426.6[化学工程] O643.36[理学—物理化学]