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Evaluation of High-Loaded Ni-Based Catalysts for Upgrading Fast Pyrolysis Bio-Oil

Carriel Schmitt, Caroline; Zimina, Anna; Fam, Yakub; Raffelt, Klaus; Grunwaldt, Jan-Dierk; Dahmen, Nicolaus

Abstract:
The catalytic activity of high-loaded Ni-based catalysts for beech wood fast-pyrolysis bio-oil hydrotreatment is compared to Ru/C. The influence of promoter, temperature, reaction time, and consecutive upgrading is investigated. The catalytic activity is addressed in terms of elemental composition, pH value, H₂ consumption, and water content, while the selectivity is based on the GC-MS/FID results. The catalysts showed similar deoxygenation activity, while the highest hydrogenation activity and the highest upgraded oil yields were obtained with Ni-based catalysts. The elemental composition of upgraded oils was comparable for 2 and 4 h of reaction, and the temperature showed a positive effect for reactions with Ni–Cr and Ru/C. Ni–Cr showed superior activity for the conversion of organic acids, sugars and ketones, being selected for the 2-step upgrading reaction. The highest activity correlates to the strength of the acid sites promoted by Cr₂O₃. Consecutive upgrading reduced the content of oxygen by 64.8% and the water content by 90%, whereas the higher heating value increased by 90.1%. While more than 96% of the organic acid content was converted, the discrepancy of aromatic compounds quantified by ¹H-NMR and GC-MS/FID may indicate polymerization of aromatics taking place during the second upgrading step.

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Verlagsausgabe §
DOI: 10.5445/IR/1000098718
Veröffentlicht am 07.10.2019
Originalveröffentlichung
DOI: 10.3390/catal9090784
Coverbild
Zugehörige Institution(en) am KIT Institut für Technische Chemie und Polymerchemie (ITCP)
Institut für Katalyseforschung und -Technologie (IKFT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 2073-4344
KITopen-ID: 1000098718
Erschienen in Catalysts
Band 9
Heft 9
Seiten 784
Vorab online veröffentlicht am 19.09.2019
Schlagworte hydrodeoxygenation, fast pyrolysis bio-oil, nickel catalyst, hydrotreatment
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