Journal ArticleDOI
Effects of support identity and metal dispersion in supported ruthenium hydrodeoxygenation catalysts
Cody Newman,Cody Newman,Xiaobo Zhou,Ben Goundie,I. Tyrone Ghampson,Rachel A. Pollock,Zachery Ross,M. Clayton Wheeler,Robert W. Meulenberg,Rachel N. Austin,Rachel N. Austin,Brian G. Frederick +11 more
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In this article, Ru catalysts with a wide range of dispersion on carbon, silica, alumina, and titania supports were synthesized, characterized and evaluated for hydrodeoxygenation (HDO) activity using phenol as a model compound.Abstract:
Substituted phenols are the most recalcitrant oxygenates in conventional pyrolysis oils and the dominant oxygenates in lower-oxygen content, formate-assisted pyrolysis oils (FAsP). Ru catalysts with a wide range of dispersion on carbon, silica, alumina, and titania supports were synthesized, characterized and evaluated for hydrodeoxygenation (HDO) activity using phenol as a model compound. Metal content, phase, and particle size were determined with ICP-OES, EXAFS/XANES, and CO pulse chemisorption, respectively. High dispersion of ruthenium on the supports converts more phenol to products. The majority of catalysts predominantly catalyze the hydrogenation (HYD) route typical of noble metal catalysts. A highly dispersed Ru/TiO2 catalyst shows unusually high selectivity toward direct deoxygenation (DDO) and outstanding activity. We suggest that the DDO pathway on titania involves a bifunctional catalyst, where hydrogen creates reduced titania sites, created by hydrogen spillover, that interact strongly with the phenol hydroxyl group.read more
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Bifunctional Catalysts for Upgrading of Biomass-Derived Oxygenates: A Review
TL;DR: A review of recent trends in the development of catalysts for deoxygenation of pyrolysis oil components can be found in this paper, where two different active materials are used to provide catalytic sites for diverse reaction steps.
Journal ArticleDOI
Experimental and Theoretical Insights into the Hydrogen-Efficient Direct Hydrodeoxygenation Mechanism of Phenol over Ru/TiO2
Ryan C. Nelson,Byeongjin Baek,Pamela Ruiz,Ben Goundie,Ashley Brooks,M. Clayton Wheeler,Brian G. Frederick,Lars C. Grabow,Rachel N. Austin +8 more
TL;DR: In this paper, the authors report results from a novel study utilizing both isotopically labeled phenol (which models the most recalcitrant components of biofuels) with D2O and DFT calculations to provide insight into the mechanism of the highly efficient HDO catalyst Ru/TiO2.
Journal ArticleDOI
Role of Keto Intermediates in the Hydrodeoxygenation of Phenol over Pd on Oxophilic Supports
Priscilla M. de Souza,Raimundo C. Rabelo-Neto,Luiz E.P. Borges,Gary Jacobs,Burtron H. Davis,Tawan Sooknoi,Daniel E. Resasco,Fabio B. Noronha +7 more
TL;DR: In this article, the performance of Pd catalysts supported on SiO2, Al2O3 and ZrO2 for the HDO of phenol has been compared in the gas phase, at 300 °C and 1 atm using a fixed bed reactor.
Journal ArticleDOI
Hydrodeoxygenation of lignin-derived phenolic compounds over bi-functional Ru/H-Beta under mild conditions
TL;DR: In this article, the effects of reaction conditions and catalyst constitution on the catalytic performance of Ru/H-Beta in hydrodeoxygenation were systematically investigated and the structure-activity relationship was proposed.
Journal ArticleDOI
Hydrodeoxygenation of lignin-derived bio-oil using molecular sieves supported metal catalysts: A critical review
TL;DR: In this paper, the authors presented a summary of the catalysts used in the reaction of lignin-derived bio-oil upgrading, including noble metal and transition metal catalysts that are supported on microporous molecular sieves.
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