文献类型：期刊文献

英文题名：Interfacial Electronic Modulation and Nanospace Confinement in Hollow Silica Nanoreactors for Enhanced Chemoselective Hydrogenation

作者：Yang, Jian[1]; Wang, Pengcheng[1]; Lin, Chao[2]; Zhou, Shenghu[1]

机构：[1] Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China; [2] State Key Laboratory of Advanced Fiber Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China

年份：2026

外文期刊名：SSRN

收录：EI(收录号：20260426071)

语种：英文

外文关键词：Activation analysis - Catalysis - Catalyst activity - Catalyst selectivity - Heterojunctions - Hydrogenation - Metal nanoparticles - Molybdenum oxide - Nanospheres - Platinum - Platinum compounds - Silica - Substrates - Synthesis (chemical)

摘要：The design of metal-oxide heterostructures confined within nanoreactor architectures is a promising route toward heterogeneous catalysts that unite high activity, selectivity, and durability. Here, we report a soft-template synthesis of Pt-MoOx hybrid nanoparticles confined within hollow porous silica nanospheres (Pt-MoOx@HPSNs) for the chemoselective hydrogenation of 4-nitrostyrene (4-NS) to 4-nitroethylbenzene (4-ENB). Under mild conditions (45 °C, 0.1 MPa H2), the optimized catalyst (Pt/Mo = 1/0.64) delivers 98.4% conversion with 93.6% selectivity to 4-ENB, markedly outperforming monometallic Pt@HPSNs (68.2% selectivity), and suppresses over-hydrogenation even upon prolonged reaction. XPS analysis supports a dual-function mechanism in which interfacial electron transfer from Pt to MoOx renders the Pt sites electron-deficient and biased toward C=C activation, while Lewis acidic MoOx sites anchor the nitro group and shield it from hydrogenation. The hollow silica nanoreactor physically isolates the nanoparticles against sintering and leaching. The catalyst sustains five consecutive cycles with only a modest selectivity loss, tolerates a five-fold increase in substrate loading, and shows no detectable metal leaching. This work establishes a structure-performance relationship for Pt-MoOx interfacial sites and illustrates how interfacial electronic engineering and spatial confinement can be combined to design practical catalysts for fine-chemical hydrogenation. ? 2026, The Authors. All rights reserved.