Propylsulfonic acid (PrSO3H) derivatised solid acid catalysts have been prepared by post modification of mesoporous SBA-15 silica with mercaptopropyltrimethoxysilane (MPTMS), with the impact of co-derivatisation with octyltrimethoxysilane (OTMS) groups to impart hydrophobicity to the catalyst investigated. Turn over frequencies (TOF) for acetic acid esterification with methanol increase with PrSO3H surface coverage across both families suggesting a cooperative effect of adjacent acid sites at high acid site densities. Esterification activity is further promoted upon co-functionalisation with hydrophobic octyl chains, with inverse gas chromatography (iGC) measurements indicating increased activity correlates with decreased surface polarity or increased hydrophobicity.
Bibliographical noteThis is the peer reviewed version of the following article: Manayil, J., dos Santos, V. C., Jentoft, F., Granollers Mesa, M., Lee, A. F., & Wilson, K. (2016). Octyl co-grafted PrSO3H/SBA-15: tunable hydrophobic solid acid catalysts for acetic acid esterification. ChemCatChem, 9 (12) 2231–2238, which has been published in final form at http://dx.doi.org/10.1002/cctc.201601370. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Funding: EPSRC (EP/K000616/2, EP/G007594/4; EP/K014749/1 and award of Leadership Fellowship); Royal Society for Industry Fellowship; EU FP7/2007-2013 (604307); CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnológico) for a postdoctoral scholarship; and NSF (1560519).
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Octyl co-grafted PrSO3H/SBA-15: tunable hydrophobic solid acid catalysts for acetic acid esterification