Pd/C catalysts based on synthetic carbons with bi- and tri-modal pore-size distribution: applications in flow chemistry

X. Fan*, V. Sans, S.K. Sharma, P.K. Plucinski, V.A. Zaikovskii, K. Wilson, S.R. Tennison, A. Kozynchenko, A.A. Lapkin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Two new types of phenolic resin-derived synthetic carbons with bi-modal and tri-modal pore-size distributions were used as supports for Pd catalysts. The catalysts were tested in chemoselective hydrogenation and hydrodehalogenation reactions in a compact multichannel flow reactor. Bi-modal and tri-modal micro-mesoporous structures of the synthetic carbons were characterised by N2 adsorption. HR-TEM, PXRD and XPS analyses were performed for characterising the synthesised catalysts. N2 adsorption revealed that tri-modal synthetic carbon possesses a well-developed hierarchical mesoporous structure (with 6.5 nm and 42 nm pores), contributing to a larger mesopore volume than the bi-modal carbon (1.57 cm3 g-1versus 1.23 cm3 g-1). It was found that the tri-modal carbon promotes a better size distribution of Pd nanoparticles than the bi-modal carbon due to presence of hierarchical mesopore limitting the growth of Pd nanoparticles. For all the model reactions investigated, the Pd catalyst based on tri-modal synthetic carbon (Pd/triC) show high activity as well as high stability and reproducibility. The trend in reactivities of different functional groups over the Pd/triC catalyst follows a general order alkyne ≫ nitro > bromo ≫ aldehyde.

Original languageEnglish
Pages (from-to)2387-2395
Number of pages9
JournalCatalysis Science and Technology
Volume6
Issue number7
Early online date19 Nov 2015
DOIs
Publication statusPublished - 7 Apr 2016

Bibliographical note

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence
-Funding: EPSRC (EP/C519736/1); Overseas Research Students Awards Scheme; University of Bath Research Studentship; and Royal Society for the award of an Industry Fellowship.

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