Jahangiri H, Osatiashtiani A, Ouadi M, Hornung A, Lee AF, Wilson K (2019)
Publication Type: Journal article
Publication year: 2019
Book Volume: 9
Article Number: 841
Journal Issue: 10
DOI: 10.3390/catal9100841
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.
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://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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