文献类型：期刊文献

英文题名：Evaluation of the Catalytic Activities of Supported Copper Catalysts Surrounded with Different Functional Groups by o-Ps Annihilation

作者：Li, Linbo[1,2]; Du, Yijun[1]; Li, Yao[1]; Shao, Linjun[1]; Qi, Chenze[1,2]; Zhou, Shujing[2]; Li, Jinjing[2]

机构：[1] Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, Shaoxing University, Zhejiang Province, Shaoxing, 312000, China; [2] School of Pharmacy, Jiamusi University, Heilongjiang, Jiamusi, 154007, China

年份：2023

卷号：64

期号：6

起止页码：909

外文期刊名：Kinetics and Catalysis

收录：EI(收录号：20235015213135)、Scopus(收录号：2-s2.0-85179351855)

语种：英文

外文关键词：Catalyst supports - Catalytic oxidation - Copper - Fourier transform infrared spectroscopy - High resolution transmission electron microscopy - Positive ions - Positron annihilation spectroscopy - Spectrum analysis - Thermogravimetric analysis - X ray photoelectron spectroscopy

外文摘要：Abstract: Developing a facile and accurate method for assessing catalytic activities of supported metals can significantly promote the preparation and application of supported metal catalysts. Herein, we synthesized five MCM-41 materials functionalized with Schiff-base groups, which were employed as the supports for copper cations. The chemical structures and coordination of copper cations on the supports were characterized by Fourier-transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The grafting densities were calculated by analyzing the results of thermal gravimetric analysis (TGA) and elemental analysis (EA). The microstructures of these supported copper catalysts were analyzed by transmission electron microscopy (TEM) and X-ray diffraction (XRD). The oxidation of thioanisole to methylphenyl sulfoxide was employed to determine the catalytic activities of these supported copper catalysts while their o-Ps annihilation properties were evaluated by the positron annihilation lifetime spectroscopy. It is found that the o-Ps annihilation properties were linearly correlated with their catalytic activities. Therefore, the catalytic activities of supported copper species surrounded by different functional groups can be easily determined through o-Ps annihilation. ? 2023, Pleiades Publishing, Ltd.