Gas-phase hydrodeoxygenation of guaiacol over iron-based catalysts. Effect of gases composition, iron load and supports (silica and activated carbon)

Olcese, Roberto N.; Bettahar, M.M.; Malaman, B.; Ghanbaja, Jaâfar; Tibavizco, L.; Petitjean, D.; Dufour, Anthony

doi:10.1016/j.apcatb.2012.09.043

Cited by 154 publications

(135 citation statements)

References 38 publications

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“…That is why the experiments are conducted with a broad range of catalyst mass, including high guaiacol and phenol conversions. As shown previously, 19,20 it is of paramount importance to conduct experiments at high conversions. Such experiments are needed to demonstrate that the catalysts are really selective for benzene and toluene productions in a significant yield.…”

Section: Energy and Fuelsmentioning

confidence: 96%

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Hydrodeoxygenation of Guaiacol, A Surrogate of Lignin Pyrolysis Vapors, Over Iron Based Catalysts: Kinetics and Modeling of the Lignin to Aromatics Integrated Process

et al. 2013

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Biosourced aromatics (BTX (benzene, toluene, xylene) and phenols) could be produced by lignin pyrolysis coupled with catalytic hydrodeoxygenation (HDO) of uncondensed pyrolysis vapors. Guaiacol is used as a model compound to study the catalytic HDO over Fe/SiO 2 catalyst. Experiments were conducted in a fixed bed reactor operated at 673 K (1 atm) with a gas mixture (guaiacol, H 2 , H 2 O, CO, CO 2 ) that mimics the real gas composition from lignin pyrolysis. Fe/SiO 2 catalyst was shown to be selective for guaiacol HDO into benzene and phenols because it does not catalyze the aromatic ring hydrogenation. Major and minor products are modeled by a semidetailed kinetic mechanism. A deactivation law is also determined. The kinetic model is then included in an Aspen Plus model of lignin to BTX process. Aspen Plus model handles (1) pyrolysis of lignin, including char, oligomers, gases and aromatic yields, (2) catalytic conversion of aromatics by the kinetic model, (3) heat exchangers, and (4) BTX vapors recovery by scrubbing with 1-methyl-naphthalene. Mass and carbon balances, heat demand, and selectivity in desired products are given for the overall process. The effect of gas dilution from pyrolysis reactor on BTX losses, heat demand, and scrubbing solvent flow rate is highlighted. High carrier gas flow rates (as required for biomass pyrolysis in fluidized bed) lead to the entrainment of fines and oligomers, dilute the products, and impact considerably the process intensification.

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Section: Energy and Fuelsmentioning

confidence: 96%

“…19,20,27,28 Gas-phase HDO prior to condensation would help to optimize heat integration of the process and reduce problems of feeding the reactive liquid bio-oils.…”

Section: Introductionmentioning

confidence: 99%

Hydrodeoxygenation of Guaiacol, A Surrogate of Lignin Pyrolysis Vapors, Over Iron Based Catalysts: Kinetics and Modeling of the Lignin to Aromatics Integrated Process

et al. 2013

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“…However, the demand and price for these metals puts them at an economic disadvantage. Other catalysts, such as nickel (Ni), cobalt (Co) [38], iron (Fe) [39], and copper (Cu) [40] conversion/96.4% HDO and 40% and 53% selectivity for both products respectively [38]. The authors also varied guaiacol content from 5% to 20% and noticed a steady decline in conversion, but no significant variation in selectivity.…”

Section: Bifunctional Catalysis: Other Metals Supported On Traditionamentioning

confidence: 99%

Hydropyrolysis of Lignin Using Pd/HZSM-5

Jan

Marchand

Anjos³

et al. 2015

Energy Fuels

105

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Hydropyrolysis of Lignin using Pd/HZSM-5 Oliver D. Jan Chair of the Supervisory Committee:Dr. Fernando Resende School of Environmental and Forest SciencesThe aim of this work was to study the formation of cycloalkanes from hydropyrolysis of lignin with HZSM-5 and Pd/HZSM-5 catalysts. We observed that palladium supported on HZSM-5 catalyzed hydrogenation and deoxygenation reactions that converted phenolic compounds into aromatic hydrocarbons and cycloalkanes. This study analyzed the effect of the catalyst-to-lignin ratio, H 2 partial pressure, and temperature on the yields of hydrocarbons with HZSM-5 and Pd/HZSM-5. Pd/HZSM-5 produced 44% more aromatic hydrocarbons than HZSM-5 at a catalyst-to-lignin ratio of 20:1, 650ºC, and a constant H 2 partial pressure of 1.7 MPa. The presence of palladium led to significant difference in yields only at 1.7 MPa H 2 partial pressure.In both the in-situ and ex-situ experiments conducted, hydropyrolysis temperature played a substantial role in the equilibrium conversion of hydrogenation reactions that led to cycloalkanes directly from lignin.iv Dedication This thesis is dedicated to my family for all their love and support v Acknowledgements

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“…Although these catalysts show considerable performance under mild conditions, their intrinsic metal properties lead to the saturation of aromatic rings [11][12][13][14]. Base metal catalysts such as Ni, Co, and Fe are also used as catalysts in the catalytic decomposition of lignin to aromatics, because their unique properties minimize the saturation of aromatic ring [15][16][17][18]. However, several studies have shown that base metal alone was not sufficient to obtain high yield for aromatics under mild conditions [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Selective cleavage of C O bond in benzyl phenyl ether to aromatics over Pd–Fe bimetallic catalyst supported on ordered mesoporous carbon

Kim

Lee

Kang

et al. 2015

Applied Catalysis A: General

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Gas-phase hydrodeoxygenation of guaiacol over iron-based catalysts. Effect of gases composition, iron load and supports (silica and activated carbon)

Cited by 154 publications

References 38 publications

Hydrodeoxygenation of Guaiacol, A Surrogate of Lignin Pyrolysis Vapors, Over Iron Based Catalysts: Kinetics and Modeling of the Lignin to Aromatics Integrated Process

Hydrodeoxygenation of Guaiacol, A Surrogate of Lignin Pyrolysis Vapors, Over Iron Based Catalysts: Kinetics and Modeling of the Lignin to Aromatics Integrated Process

Hydropyrolysis of Lignin Using Pd/HZSM-5

Selective cleavage of C O bond in benzyl phenyl ether to aromatics over Pd–Fe bimetallic catalyst supported on ordered mesoporous carbon

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