文献类型：期刊文献

英文题名：Evaluating the catalytic performances of supported transition metal catalysts by positron annihilation lifetime spectroscopy

作者：Su, Baogang[1];Li, Yao[1];Du, Yijun[1];Shao, Linjun[1];Tao, Hongyu[1];Qi, Chenze[1,2];Zhou, Shujing[1,2];Li, Jinjing[2]

机构：[1]Shaoxing Univ, Zhejiang Key Lab Alternat Technol Fine Chem Proc, Shaoxing 312000, Zhejiang, Peoples R China;[2]Jiamusi Univ, Sch Pharm, Jiamusi 154007, Heilongjiang, Peoples R China

年份：2023

卷号：183

外文期刊名：JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS

收录：SCI-EXPANDED(收录号：WOS:001093006300001)、、EI(收录号：20233814758890)、Scopus(收录号：2-s2.0-85171585378)、WOS

语种：英文

外文关键词：o-Ps annihilation; Supported transition metal catalyst; Catalytic performance; Reduction of 4-nitrophenol; Positron annihilation lifetime spectroscopy

外文摘要：Supported transition metal catalysts have played a critical role in the modern synthetic chemical industry. Herein, MCM-41 was chemically modified with amino groups and then used as the support of six transition metal cations. The chemical structures, microstructures and dispersions of these supported transition metal cations were carefully characterized by XRD, TEM and BET. The chelations of modified MCM-41 support with these transition metal cations were confirmed by FT-IR and XPS. The reduction reaction of 4-nitrophenol into 4-amino phenol was employed to evaluate the catalytic activities and recyclabilities of these supported transition metal catalysts. Meanwhile, their reactivities with o-Ps species were assessed by positron annihilation lifetime spectroscopy (PALS). It was found that the reduced o-Ps annihilation intensities (Delta I3) were well associated with their catalytic activities while the o-Ps annihilation lifetime values (tau 3) were related to their catalytic recyclabilities. In all, the catalytic activities and recyclabilities of supported transition metal cations can be conveniently evaluated by their o-Ps annihilation properties. This method holds great potential in the design and preparation of highly active and stable supported transition metal catalysts.