文献类型：期刊文献

英文题名：Enhanced Alkene Selectivity for Transfer Semihydrogenation of Alkynes over Electron-Deficient Pt Nanoparticles Encapsulated in Hollow Silica Nanospheres

作者：Wang, Zizhu[1];Xu, Caiyun[1];Wang, Yuhua[1];Zhou, Shenghu[1]

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

年份：2023

卷号：15

期号：7

起止页码：10292

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;EI(收录号：20230813626654);WOS:【SCI-EXPANDED(收录号:WOS:000935406700001)】；

基金：ACKNOWLEDGMENTS This work is financially supported by the National Natural Science Foundation of China (Grant Nos. 22078099, 21776090) .

语种：英文

外文关键词：phenylacetylene; transfer semihydrogenation; hollow nanoreactors; electron deficiency; platinum

摘要：In this work, we report that Pt nanoparticles confined in hollow porous silica nanospheres (Pt@HPSNs) function as highly selective catalysts for the transfer hydrogenation of phenylacetylene to styrene with ammonia borane. Relative to the deep hydrogenation of phenylacetylene to ethylbenzene over the supported Pt/SiO2, Pt@HPSNs exhibit above 88% of styrene selectivity at nearly 100% of phenylacetylene conversions, and the high selectivity of Pt@HPSNs can be maintained even at high ammonia borane/phenylacetylene ratios and longer reaction time. The Pt 4f X-ray photoelectron spectrum of Pt@HPSNs shows a remarkable similar to 1.5 eV shift to high binding energy, proving the nature of electron deficiency of such encapsulated Pt nanoparticles. Combined with extremely minor transfer hydrogenation of styrene to ethylbenzene when styrene as substrates, the enhanced styrene selectivity of Pt@HPSNs is ascribed to the electron deficiency of encapsulated Pt nanoparticles, which leads to the fast desorption of styrene and thus avoids deep hydrogenation.