title: One-pot multistep cascade reactions over multifunctional nanocomposites with Pd nanoparticles supported on amine-modified mesoporous silica.
abstract: Two kinds of multifunctional nanocomposites, SBA-15-NH2/Pd-p and SBA-15-NH2/Pd-f, with platelet-like and fiber-like morphologies, respectively, were fabricated by immobilizing Pd NPs onto amine-functionalized SBA-15. Some of the amino groups acted as anchoring sites for Pd NPs, whilst the remaining groups acted as Brønsted basic sites. As a result, the composites served as excellent multifunctional heterogeneous catalysts for one-pot multistep cascade reaction sequences. Moreover, when diffusion was the rate-determine step, SBA-15-NH2/Pd-p, with small mesopores, was superior to the fiber-like control sample, owing to its short diffusion length, a lower possibility of pore clogging, and better mass transportation for the reaction species during the catalysis.
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190 (P. R. China), Tel and Fax: (+86) 10-6255-7908; Graduate University of Chinese Academy of Sciences, Beijing, 100049 (P. R. China).
authors.forename: Ping
authors.initials: P
authors.lastname: Li
authors.forename: Hua
authors.initials: H
authors.lastname: Liu
authors.forename: Yu
authors.initials: Y
authors.lastname: Yu
authors.forename: Chang-Yan
authors.initials: CY
authors.lastname: Cao
authors.forename: Wei-Guo
authors.initials: WG
authors.lastname: Song
keywords: diffusion; heterogeneous catalysis; mesoporous materials; nanoparticles; palladium