Atmospheric hydrodeoxygenation of phenol as pyrolytic-oil model compound for hydrocarbon production using Ag/TiO 2 catalyst

Kay Lup, A.N. and Abnisa, F. and Daud, W.M.A.W. and Aroua, M.K. (2019) Atmospheric hydrodeoxygenation of phenol as pyrolytic-oil model compound for hydrocarbon production using Ag/TiO 2 catalyst. Asia-Pacific Journal of Chemical Engineering, 14 (2). ISSN 1932-2135

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Abstract

Hydrodeoxygenation (HDO) kinetics of phenol over Ag/TiO 2 catalyst was investigated at 415–600 K and 1 atm. The use of oxophilic TiO 2 support has improved phenol conversion due to its preferential activation of CO bond. Product analysis confirmed the occurrence of direct deoxygenation (DDO) and hydrogenation–dehydration (HYD) pathways to produce benzene and cyclohexane, respectively. Both phenol hydrogenolysis and hydrogenation steps are the respective rate-limiting steps for DDO and HYD pathways of phenol HDO over Ag/TiO 2 . Based on the transition state theory, negative entropy changes of activation during HDO indicated that the HDO reactants formed activated complexes that had more orderly bonding configurations prior to the hydrogenolysis, hydrogenation, and dehydration steps. Under the present conditions, the catalyst was stable after 4 hr of HDO runs and able to be regenerated via H 2 -activation and calcination in air at 553 K with at least 98.9% removal efficiency to remove coke deposits and reform Ag metal species after HDO.

Item Type:
Journal Article
Journal or Publication Title:
Asia-Pacific Journal of Chemical Engineering
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2100/2105
Subjects:
ID Code:
131685
Deposited By:
Deposited On:
26 Feb 2020 14:30
Refereed?:
Yes
Published?:
Published
Last Modified:
27 Oct 2020 08:49