Mesoporous Microcapsules through d-Glucose Promoted Hydrothermal Self-Assembly of Colloidal Silica: Reusable Catalytic Containers for Palladium Catalyzed Hydrogenation Reactions

详细信息    查看全文

• 作者：Basuvaraj Suresh Kumar ; Arlin Jose Amali ; Kasi Pitchumani
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2017
• 出版时间：January 3, 2017
• 年：2017
• 卷：5
• 期：1
• 页码：667-674
• 全文大小：585K
• ISSN：2168-0485

文摘

A facile methodology is reported to fabricate hierarchically ordered silica nanoassembled microcapsules (SiO₂ NACs) with tailored mesopores by combining polymerization of d-glucose with self-assembly of colloidal silica nanoparticles (SiO₂ NPs). This controlled self-assembly of SiO₂ NPs during a hydrothermal process enables the formation of core–shell (organic/inorganic) hybrid microspheres of carbon and SiO₂ NPs. After removal of carbon, spherical hollow SiO₂ NACs are formed having mesopores and their surface area was observed as 248 m²/g. The synthesized mesoporous SiO₂ NACs can be effectively used to encapsulate palladium nanoparticles (Pd NPs) to act as a heterogeneous catalyst in hydrogenation reactions. The position of Pd NPs in SiO₂ NACs (either inside the nanopores or throughout the wall of the capsules) can be dictated by the method of encapsulation which can impart selectivity in hydrogenation of various nitroaromatic compounds, alkyne, and alkenes. The advantages of our catalytic system are greener synthesis of catalyst, that lower Pd content (0.3 mol %) was utilized for the catalytic hydrogenation reaction, heterogeneous nature and reusability.