Multilayer-stacked paper-structured catalysts for microflow Suzuki–Miyaura cross-coupling reaction

Yuki Ishihara, Kyohei Kanomata, Taichi Homma, Takuya Kitaoka

Research output: Contribution to journalArticle

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Abstract

Paper-like porous composites of ceramic fibers and ZnO whiskers were prepared using a papermaking technique, followed by the in situ synthesis of a Pd catalyst on the ZnO whiskers using a facile impregnation method. The flexible Pd@ZnO papers had micrometer-sized pores of average diameter ca. 25 μm, which promoted the effective diffusion of reactants passing through an assembly of vertically stacked papers in a flow reactor. The catalytic efficiency of the stacked Pd@ZnO papers in a flow Suzuki–Miyaura cross-coupling (SMC) reaction to synthesize 4-methylbiphenyl from phenylboronic acid and 4-iodotoluene was higher than that of a bead-type Pd particulate catalyst in a reactor. Microchannels originating from the porous fiber-network microstructures in the stacked papers contributed to effective heterogeneous catalysis, possibly by enabling smooth diffusion of substrates to the surfaces of the Pd catalysts, as in a microreactor system. K 2 CO 3 , which was used as the base in the SMC reaction, was also immobilized in the paper-structured fibrous composites. Stacks of two types of paper, i.e., containing either Pd catalysts or K 2 CO 3 , significantly affected the SMC catalytic activity in a continuous microflow reaction. A combination of K 2 CO 3 papers upstream and Pd@ZnO papers downstream in the flow system provided higher catalytic efficiency via on-site K 2 CO 3 -mediated borate formation of phenylboronic acid in the initial stage in the reactor. Tailoring of the stacking patterns of the paper-structured composites is expected to be effective for sequential SMC reaction and to improve catalytic process engineering.

Original languageEnglish
Pages (from-to)523-537
Number of pages15
JournalReaction Kinetics, Mechanisms and Catalysis
Volume121
Issue number2
DOIs
Publication statusPublished - Jan 1 2017

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cross coupling
Carbon Monoxide
Multilayers
catalysts
Catalysts
reactors
composite materials
Composite materials
ceramic fibers
Ceramic fibers
Borates
acids
Acids
Papermaking
Process engineering
microchannels
Microchannels
borates
Impregnation
beads

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Physical and Theoretical Chemistry

Cite this

Multilayer-stacked paper-structured catalysts for microflow Suzuki–Miyaura cross-coupling reaction. / Ishihara, Yuki; Kanomata, Kyohei; Homma, Taichi; Kitaoka, Takuya.

In: Reaction Kinetics, Mechanisms and Catalysis, Vol. 121, No. 2, 01.01.2017, p. 523-537.

Research output: Contribution to journalArticle

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