Journal
CATALYSIS SCIENCE & TECHNOLOGY
Volume 6, Issue 7, Pages 2387-2395Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cy01401h
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Funding
- Engineering and Physical Sciences Research Council [EP/C519736/1]
- Overseas Research Students Awards Scheme
- University of Bath
- Royal Society
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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 N-2 adsorption. HR-TEM, PXRD and XPS analyses were performed for characterising the synthesised catalysts. N-2 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 cm(3) g(-1) versus 1.23 cm(3) 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.
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