文献类型：期刊文献

英文题名：Kinetics and mechanism of propylene hydro-oxidation to acrolein on Au catalysts

作者：Du, Wei[1];Zhang, Zhihua[1];Song, Nan[1];Duan, Xuezhi[1];Zhou, Xinggui[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2024

卷号：17

期号：1

起止页码：354

外文期刊名：NANO RESEARCH

收录：;EI(收录号：20233214509419);WOS:【SCI-EXPANDED(收录号:WOS:001043355400001)】；

基金：This work was financially supported by the Research Fund for National Key R&D Program of China (No. 2021YFA1501403), the National Natural Science Foundation of China (Nos. 22038003, 21922803, 22178100, and 22208094), the Program of Shanghai Academic/Technology Research Leader (No. 21XD1421000), the Shanghai Science and Technology Innovation Action Plan (No. 22JC1403800), and the Innovation Program of the Shanghai Municipal Education Commission.

语种：英文

外文关键词：kinetics; mechanism; gold; acrolein; hydro-oxidation

摘要：Propylene epoxidation by H-2 and O-2 to propylene oxide (PO) over the Au-Ti bifunctional catalysts, as an ideal reaction for PO production, has attracted great interest. Revealing the mechanism of acrolein formation is of great importance for understanding the mechanism of molecular oxygen activation and the formation of hydroperoxo species on the Au sites. Here, we investigate the reaction mechanism of propylene oxidation to acrolein on the Au/uncalcined TS-1 (Au/TS-1-B) catalyst through a combination of multiple characterization, H-2/D-2 exchange, kinetics experiment, and modeling. The Ti sites are found to be non-essential to acrolein formation. Moreover, the acrolein formation on the Au/TS-1-B catalyst is confirmed to be promoted by H-2 through hydroperoxo species formation, which includes two main steps: propylene dehydrogenation to *C3H5 with the aid of *OOH species, and *C3H5 oxidation by *OOH to acrolein. The latter step is determined to be the rate-determining step because the corresponding kinetics model gives the best description for experimental results. This work not only provides kinetics insights for the propylene hydro-oxidation to acrolein on the Au-Ti bifunctional catalysts, but also facilitates the rational design of Au catalysts with high activity and selectivity in the direct propylene epoxidation with H-2 and O-2.