Paving the way towards green catalytic materials for green fuels: impact of chemical species on Mo-based catalysts for hydrodeoxygenation

A series of Mo-based catalysts were synthesized by tuning the sulfidation temperature to produce mixtures of MoO 3 and MoS 2 as active phases for the hydrodeoxygenation (HDO) of palmitic acid. Differences in the oxidation states of Mo, and the chemical species present in the catalytic materials were...

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Bibliographic Details
Published in:RSC advances 2019-06, Vol.9 (32), p.18292-1831
Main Authors: Valencia, Diego, Díaz-García, Leonardo, Ramírez-Verduzco, Luis Felipe, Qamar, Amir, Moewes, Alexander, Aburto, Jorge
Format: Article
Language:English
Subjects:
Biomass
Catalysis
Catalysts
Catalytic activity
Chemical synthesis
Chemistry
Fuels
Model testing
Molybdenum disulfide
Molybdenum oxides
Molybdenum trioxide
Organic chemistry
Oxidation
Palmitic acid
Sulfidation
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Summary:A series of Mo-based catalysts were synthesized by tuning the sulfidation temperature to produce mixtures of MoO 3 and MoS 2 as active phases for the hydrodeoxygenation (HDO) of palmitic acid. Differences in the oxidation states of Mo, and the chemical species present in the catalytic materials were determined by spectroscopic techniques. Palmitic acid was used as a fatty-acid model compound to test the performance of these catalysts. The catalytic performance was related to different chemical species formed within the materials. Sulfidation of these otherwise inactive catalysts significantly increased their performance. The catalytic activity remains optimal between the sulfidation temperatures of 100 °C and 200 °C, whereas the most active catalyst was obtained at 200 °C. The catalytic performance decreased significantly at 400 °C due to a higher proportion of sulfides formed in the materials. Furthermore, the relative proportion of MoO 3 to MoS 2 is essential to form highly active materials to produce O-free hydrocarbons from biomass feedstock. The transition from MoS 2 to MoO 3 reveals the importance of Mo-S and Mo-O catalytically active species needed for the HDO process and hence for biomass transformation. We conclude that transitioning from MoS 2 to MoO 3 catalysts is a step in the right direction to produce green fuels. A series of Mo-based catalysts were synthesized by tuning the sulfidation temperature to produce mixtures of MoO 3 and MoS 2 as active phases for the hydrodeoxygenation (HDO) of palmitic acid.
ISSN:2046-2069
2046-2069
DOI:10.1039/c9ra03208h