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Issue 19, 2019
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Unravelling mass transport in hierarchically porous catalysts

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Abstract

Bio-derived platform chemicals and fuels are important for the development of sustainable manufacturing. However, their efficient production from biomass necessitates new catalysts and processes optimised for the selective transformation of large molecules. Mesoporous and hierarchically porous functional materials are promising catalyst candidates for biomass valorisation, but quantitative relationships between pore dimensions/connectivity, mass transport, and corresponding catalytic performance are poorly defined. A family of hierarchical macroporous–mesoporous SBA-15 sulfonic acids were prepared with tunable macropore diameters for carboxylic acid esterification. Turnover frequencies for long-chain (palmitic and erucic) acids were proportional to macropore diameter (≤370 nm), whereas propanoic acid esterification was independent of macropore size. Pulsed field gradient NMR diffusion experiments reveal that larger macropores enhance esterification of bulky carboxylic acids by conferring superior pore interconnectivity and associated mass transport.

Graphical abstract: Unravelling mass transport in hierarchically porous catalysts

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Publication details

The article was received on 19 Feb 2019, accepted on 08 Apr 2019 and first published on 24 Apr 2019


Article type: Paper
DOI: 10.1039/C9TA01867K
J. Mater. Chem. A, 2019,7, 11814-11825
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    Unravelling mass transport in hierarchically porous catalysts

    M. A. Isaacs, N. Robinson, B. Barbero, L. J. Durndell, J. C. Manayil, Christopher M. A. Parlett, C. D'Agostino, K. Wilson and A. F. Lee, J. Mater. Chem. A, 2019, 7, 11814
    DOI: 10.1039/C9TA01867K

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