Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Atmospheric hydrodeoxygenation of phenol as pyrolytic-oil model compound for hydrocarbon production using Ag/TiO 2 catalyst
AU - Kay Lup, A.N.
AU - Abnisa, F.
AU - Daud, W.M.A.W.
AU - Aroua, M.K.
PY - 2019/3/1
Y1 - 2019/3/1
N2 - 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 CO 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.
AB - 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 CO 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.
KW - Gas-phase hydrodeoxygenation
KW - Kinetic modeling
KW - Phenol
KW - Silver catalyst
KW - Titania support
KW - Chemical activation
KW - Dehydration
KW - Hydrogenolysis
KW - Hydrolysis
KW - Phenols
KW - Titanium dioxide
KW - Bonding configurations
KW - Hydrocarbon production
KW - Hydrodeoxygenation
KW - Removal efficiencies
KW - Titania supports
KW - Transition state theories
KW - Catalyst supports
U2 - 10.1002/apj.2293
DO - 10.1002/apj.2293
M3 - Journal article
VL - 14
JO - Asia-Pacific Journal of Chemical Engineering
JF - Asia-Pacific Journal of Chemical Engineering
SN - 1932-2135
IS - 2
M1 - e2293
ER -