Details

Autor(en) / Beteiligte

• Yue, Qin
• Zhang, Yu
• Wang, Chun
• Wang, Xiqing
• Sun, Zhenkun
• Hou, Xiu-Feng
• Zhao, Dongyuan
• Deng, Yonghui

Titel

Magnetic yolk–shell mesoporous silica microspheres with supported Au nanoparticles as recyclable high-performance nanocatalysts

Ist Teil von

• Journal of materials chemistry. A, Materials for energy and sustainability, 2015-01, Vol.3 (8), p.4586-4594

Erscheinungsjahr

2015

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Based on the surface engineering strategy, multifunctional yolk-shell microspheres with a magnetic core encapsulated in hollow mesoporous silica have been rationally synthesized through a stepwise solution-phase interface deposition approach by combining the sol-gel chemistry and surfactant-involved co-assembly process. The resulting microspheres possess a well-defined yolk-shell structure, uniform sizes, high magnetization ( similar to 23.5 emu g super(-1)), perpendicularly aligned mesopore channels ( similar to 2.2 nm in diameter), high surface area ( similar to 405 m super(2) g super(-1)) and controllable void space size (320-430 nm in diameter). Gold nanoparticles of 4.2 nm are incorporated into the yolk-shell microspheres, leading to a novel magnetically recyclable nanocatalyst. The obtained catalyst exhibits an excellent catalytic performance for styrene epoxidation with high conversion (91.4%) and selectivity (83.1%) in 12 h, much better than its counterpart, Au-loaded magnetic mesoporous silica catalyst. The multifunctional yolk-shell microspheres possess superior stability in terms of catalysis performance and porous yolk-shell structure even after 12 cycles of catalysis.