Supported metal nanoparticles catalysts obtained in one-step
(2022) French Conference on Catalysis — Location: Ronce-les-Bains, France (30.May.2022)
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- Dispersing metal nanoparticles onto (porous) oxide carriers is a recurring challenge for catalysis scientists. Conventionally, impregnation, grafting, deposition, and precipitation methods are used – often using complex multi-step procedures – in an attempt to stabilize small particles, to disperse them homogeneously throughout the support, to prevent their sintering during thermal treatment or reaction, to optimize their interaction with the carrier. The task is even harder when considering silica as the support. Here, we propose a different approach, based on the one-pot synthesis of metal-doped silica microspheres followed by calcination. The preparation leverages on the aerosol assisted sol-gel process.[1] The method – which earlier proved successful for the preparation of various mesoporous mixed catalysts for many different applications[2] – is shown to allow trapping metal precursors into a mesostructured silica matrix in a highly dispersed manner. Then, upon calcination, the controlled formation metal nanoparticles can be triggered. Importantly, the method can be coupled with templating strategies (using evaporation-induced self-assembly) to obtain mesoporous catalysts. Also, the direct doping with other oxides is straightforward. In this contribution, we will demonstrate the versatility of the method with a series of recent examples: Ag- and Cu-based catalysts for the upgrading of ethanol to butadiene or to acetaldehyde, Au-based catalysts for the selective oxidation of glycerol, Cu-based catalysts for the CO2 to methanol reaction.[3] We show how the control on metal nanoparticles size, location, embedding in and interactions with the support allows tuning the behavior of the catalyst and reaching higher performance.
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Debecker, D. (2022). Supported metal nanoparticles catalysts obtained in one-step. French Conference on Catalysis, Ronce-les-Bains, France. https://hdl.handle.net/2078.5/27234