title: Grafted Polymethylhydrosiloxane on Hierarchically Porous Silica Monoliths: A New Path to Monolith-Supported Palladium Nanoparticles for Continuous Flow Catalysis Applications.
abstract: Polymethylhydrosiloxane has been grafted on the surface of a hierarchically porous silica monolith using a facile catalytic reaction between Si-H and silanol to anchor the polymer. This easy methodology leads to the functionalization of the surface of a silica monolith, where a large amount of free Si-H bonds remain available for reducing metal ions in solution. Palladium nanoparticles of 15 nm have been synthesized homogeneously inside the mesopores of the monolith without any stabilizers, using a flow of a solution containing Pd2+. This monolith was used as column-type fixed bed catalyst for continuous flow hydrogenation of styrene and selective hydrogenation of 3-hexyn-1-ol, in each case without a significant decrease of the catalytic activity after several hours or days. Conversion, selectivity, and stereoselectivity of the alkyne hydrogenation can be tuned by flow rates of hydrogen and the substrate solution, leading to high productivity (1.57 mol g(Pd)-1h-1) of the corresponding cis-alkene.
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University , Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan.
authors.forename: Carl-Hugo
authors.identifier: http://orcid.org/0000-0002-2906-4708
authors.initials: CH
authors.lastname: Pélisson
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University , Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan.
authors.forename: Takahiro
authors.initials: T
authors.lastname: Nakanishi
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University , Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan.
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhu
authors.affiliation: GL Sciences Inc./Kyoto University , Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan.
authors.forename: Kei
authors.initials: K
authors.lastname: Morisato
authors.affiliation: Department of Chemical Engineering, Nara National College of Technology , 22 Yata-cho, Yamatokoriyama, Nara 639-1080, Japan.
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Kamei
authors.affiliation: Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan.
authors.forename: Ayaka
authors.initials: A
authors.lastname: Maeno
authors.affiliation: Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan.
authors.forename: Hironori
authors.initials: H
authors.lastname: Kaji
authors.affiliation: Department of Applied Chemistry and Chemical Engineering, National Institute of Technology , Toyama College 13 Hongo-machi, Toyama 939-8630, Japan.
authors.forename: Shunki
authors.initials: S
authors.lastname: Muroyama
authors.affiliation: Department of Applied Chemistry and Chemical Engineering, National Institute of Technology , Toyama College 13 Hongo-machi, Toyama 939-8630, Japan.
authors.forename: Masamoto
authors.initials: M
authors.lastname: Tafu
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University , Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan.
authors.forename: Kazuyoshi
authors.identifier: http://orcid.org/0000-0001-5087-9808
authors.initials: K
authors.lastname: Kanamori
authors.affiliation: Department of Chemical Engineering, Nara National College of Technology , 22 Yata-cho, Yamatokoriyama, Nara 639-1080, Japan.
authors.forename: Toyoshi
authors.initials: T
authors.lastname: Shimada
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University , Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan.
authors.forename: Kazuki
authors.initials: K
authors.lastname: Nakanishi
keywords: catalysis; hydrosilylation; mesoporous materials; palladium nanoparticle; polymer; selective hydrogenation; silica monolith