Preparation of mesoporous Pd/Si3N4nanocomposites as heterogeneous catalysts via three different chemical routes

Abstract

Mesoporous palladium/silicon nitride nanocomposites were prepared via three different chemical routes to generate simultaneous control of the solid-state morphology of the palladium nanoparticles and that of the silicon nitride support at the same time as controlling the pore size and size distribution. Pyrolysis of the reaction product of silicon diimide gel with PdCl 2 under a NH 3 flow at 1000°C gave a composite with highly crystalline Pd nanoparticles dispersed in an α-Si 3 N 4 matrix. A composite with partially crystallized Pd nanoparticles dispersed in an amorphous Si 3 N 4 matrix was obtained by the hydrogen reduction of the reaction product of silicon nitride with PdCl 2 , whereas hydrogen reduction of an impregnated mixture of Si 3 N 4 with bis(dibenzylideneacetone)palladium (DBA) led to the formation of a composite with amorphous Pd nanoparticles dispersed in an amorphous Si 3 N 4 matrix. Most of these new mesoporous nanocomposites exhibit a high surface area > 400 m 2 g -1 and a narrow pore size distribution of 5-12 nm with a loading of up to 2% Pd nanoparticles 2-20 nm in diameter. Preliminary investigations show that these nanocomposites are potentially useful heterogeneous catalysts for a range of liquid-phase chemical reactions. © 2006 American Chemical Society.

Citation

Cheng, F., Kelly, S. M., Young, N. A., Hope, C. N., Beverley, K., Francesconi, M. G., Clark, S., Bradley, J. S., & Lefebvre, F. (2006). Preparation of mesoporous Pd/Si3N4nanocomposites as heterogeneous catalysts via three different chemical routes. Chemistry of materials : a publication of the American Chemical Society, 18(25), 5996-6005. https://doi.org/10.1021/cm061106h

• Journal Article Type: Article
• Publication Date: Dec 12, 2006
• Deposit Date: Oct 15, 2019
• Journal: Chemistry of Materials
• Print ISSN: 0897-4756
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 18
• Issue: 25
• Pages: 5996-6005
• DOI: https://doi.org/10.1021/cm061106h
• Public URL: https://hull-repository.worktribe.com/output/592292