文献类型：期刊文献

中文题名：Pd(111),Pd(100)及Pd(110)表面H_2和O_2直接合成H_2O_2的密度泛函理论研究

英文题名：Density functional theory study of direct synthesis of H_2O_2 from H_2 and O_2 on Pd(111),Pd(100),and Pd(110) surfaces

作者：田鹏飞[1];欧阳李科[1];徐新潮[1];徐晶[1];韩一帆[1]

机构：[1]华东理工大学化学工程联合国家重点实验室,上海200237

年份：2013

卷号：34

期号：5

起止页码：1002

中文期刊名：催化学报

外文期刊名：CHINESE JOURNAL OF CATALYSIS

收录：CSTPCD;;EI(收录号：20132216385710);Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000318744600023)】；北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：This work was supported by the National Natural Science Foundation of China (21176071, 21106041).

语种：中文

中文关键词：钯;过氧化氢;氢气;氧气;直接合成;密度泛函理论

外文关键词：Palladium;Hydrogen peroxide;Hydrogen;Oxygen;Direct synthesis;Density functional theory

摘要：采用周期性密度泛函理论研究了H2和O2在Pd(111),Pd(100)及Pd(110)表面上直接合成H2O2的反应机理,对反应的主要基元步骤进行了计算和分析.结果表明,Pd(111)表面对H2O2直接合成的催化选择性最好,表面原子密度较低的Pd(100)表面和Pd(110)表面上含有O–O键的表面物种解离严重,不利于H2O2的生成.H2O2的选择性与含有O–O键表面物种的O–O键能和表面物种的结合能有关.含有O–O键的表面物种在表面的结合能越大,越容易发生解离,不利于形成H2O2.
The direct synthesis of hydrogen peroxide (H2O2) from hydrogen (H2) and oxygen (O2) on Pd(111), Pd(100), and Pd(110) surfaces was investigated using periodic density functional theory (DFT) calculations. Several elementary steps making up this reaction were postulated and calculated. The Pd(111) surface shows the highest catalytic selectivity for H2O2 among the three surfaces. Open surfaces such as Pd(100) and Pd(110) are not favorable for this reaction because O–O-containing species on these surfaces dissociate easily. The O–O bond energy and the binding energy of O–O-containing surface species are responsible for catalytic selectivity. The higher binding energy of O–O-containing surface species is not favorable for the direct synthesis of H2O2 because the high-er binding energy results in lower dissociation barriers.