Ga/HZSM-5 catalysed acetic acid ketonisation for upgrading of biomass pyrolysis vapours

Jahangiri H, Osatiashtiani A, Ouadi M, Hornung A, Lee AF, Wilson K (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Catalysts MDPI

Book Volume: 9

Article Number: 841

Journal Issue: 10

DOI: 10.3390/catal9100841

Abstract

Pyrolysis bio-oils contain significant amounts of carboxylic acids which limit their utility as biofuels. Ketonisation of carboxylic acids within biomass pyrolysis vapours is a potential route to upgrade the energy content and stability of the resulting bio-oil condensate, but requires active, selective and coke-resistant solid acid catalysts. Here we explore the vapour phase ketonisation of acetic acid over Ga-doped HZSM-5. Weak Lewis acid sites were identified as the active species responsible for acetic acid ketonisation to acetone at 350^◦C and 400^◦C. Turnover frequencies were proportional to Ga loading, reaching ~6 min⁻¹ at 400^◦C for 10Ga/HZSM-5. Selectivity to the desired acetone product correlated with the weak:strong acid site ratio, being favoured over weak Lewis acid sites and reaching 30% for 10Ga/HZSM-5. Strong Brønsted acidity promoted competing unselective reactions and carbon laydown. 10Ga/HZSM-5 exhibited good stability for over 5 h on-stream acetic acid ketonisation.

Authors with CRIS profile

Andreas Hornung Lehrstuhl für Hochtemperaturprozesstechnik

Involved external institutions

University of Birmingham

United Kingdom (GB) RMIT University

Australia (AU) Aston University

United Kingdom (GB)

How to cite

APA:

Jahangiri, H., Osatiashtiani, A., Ouadi, M., Hornung, A., Lee, A.F., & Wilson, K. (2019). Ga/HZSM-5 catalysed acetic acid ketonisation for upgrading of biomass pyrolysis vapours. Catalysts, 9(10). https://dx.doi.org/10.3390/catal9100841

MLA:

Jahangiri, Hessam, et al. "Ga/HZSM-5 catalysed acetic acid ketonisation for upgrading of biomass pyrolysis vapours." Catalysts 9.10 (2019).

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