2020/12/24 by V. L. Yurpalov, Vyacheslav L. Yurpalov, Aleksandr A. Neponiashchii +8
Chemistry · Engineering · Materials Science · #Catalysis and Hydrodesulfurization Studies #Catalytic Processes in Materials Science #Petroleum Processing and Analysis
paper · doi:10.1002/mrc.5126
openalex publication_date 2020/12/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/26
Abstract This paper presents the study results of NiMo/B 2 O 3 –Al 2 O 3 (0–30% wt. of B 2 O 3 ) catalysts for vegetable oil hydrodeoxygenation before and after catalytic tests by different electron paramagnetic resonance (EPR) methodologies. For the initial catalysts, the concentration of Brønsted acidic sites (BAS) determined by probe EPR with perylene increases linearly with an increase in the modifier (B 2 O 3 ) content in the samples. It was found that the isomerization activity of the catalysts increases with increasing the concentration of determined BAS. As for the spent catalysts, linear correlation of paramagnetic species concentration with the content of carbon deposits (determined by thermogravimetric analysis [TGA]/differential thermal analysis [DTA]) was found. The main reasons for the NiMo/B 2 O 3 –Al 2 O 3 catalysts deactivation over the formation of carbon deposits related to the participation of acidic sites (both Lewis and Brønsted) in the polycondensation of hydrocarbons via radical species are also proposed.