TY - JOUR
T1 - Insight into the effect of metal and support for mild hydrodeoxygenation of lignin-derived phenolics to BTX aromatics
AU - Sirous-Rezaei, Pouya
AU - Jae, Jungho
AU - Cho, Kunkyung
AU - Ko, Chang Hyun
AU - Jung, Sang Chul
AU - Park, Young Kwon
N1 - Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2019/12/1
Y1 - 2019/12/1
N2 - Hydrodeoxygenation (HDO) of lignin-derived phenolics, including the reactions of hydrogenation and dehydration, is an efficient method for production of bio-based aromatic hydrocarbons. The purpose of this study was to explore the catalytic performance of different metals as hydrogenation active sites (Pd, Ru, Cu and Ni) and mild acidic supports (ZrO2, CeO2 and ZrCeO2) as dehydration promoter in order to enhance the HDO efficiency under mild reaction conditions (temperature <350 °C, pressure: 1 atm). Rhenium oxide was added to all catalysts to increase catalyst acidity for an enhanced dehydration activity. m-Cresol and guaiacol were used as phenolic lignin model compounds. Zirconia showed better performance than ceria as a result of its higher acid density. The hydrogenation activity order of metals was as follows: Pd > Ni > Ru > Cu. All the hydrogenation metals selectively promoted the hydrogenation of carbonyl group, and led to the selective formation of aromatic hydrocarbons. The catalyst of PdReOx/ZrO2 was used for HDO of m-cresol in the temperature range of 250–300 °C, and almost retained its entire catalytic activity by temperature reduction. This is due to the mild acid strength induced by zirconia support and rhenium oxide which do not cause phenolic adsorption and trapping at atmospheric pressure and low temperatures.
AB - Hydrodeoxygenation (HDO) of lignin-derived phenolics, including the reactions of hydrogenation and dehydration, is an efficient method for production of bio-based aromatic hydrocarbons. The purpose of this study was to explore the catalytic performance of different metals as hydrogenation active sites (Pd, Ru, Cu and Ni) and mild acidic supports (ZrO2, CeO2 and ZrCeO2) as dehydration promoter in order to enhance the HDO efficiency under mild reaction conditions (temperature <350 °C, pressure: 1 atm). Rhenium oxide was added to all catalysts to increase catalyst acidity for an enhanced dehydration activity. m-Cresol and guaiacol were used as phenolic lignin model compounds. Zirconia showed better performance than ceria as a result of its higher acid density. The hydrogenation activity order of metals was as follows: Pd > Ni > Ru > Cu. All the hydrogenation metals selectively promoted the hydrogenation of carbonyl group, and led to the selective formation of aromatic hydrocarbons. The catalyst of PdReOx/ZrO2 was used for HDO of m-cresol in the temperature range of 250–300 °C, and almost retained its entire catalytic activity by temperature reduction. This is due to the mild acid strength induced by zirconia support and rhenium oxide which do not cause phenolic adsorption and trapping at atmospheric pressure and low temperatures.
KW - BTX aromatics
KW - Lignin-derived phenolics
KW - Mild acidity
KW - Mild hydrodeoxygenation
KW - Reaction selectivity
UR - http://www.scopus.com/inward/record.url?scp=85054643360&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2018.10.058
DO - 10.1016/j.cej.2018.10.058
M3 - Article
AN - SCOPUS:85054643360
SN - 1385-8947
VL - 377
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 120121
ER -