Effect of support composition on acid properties and deactivation of Pt/WO3–Al2O3 catalysts for vegetable oil hydrodeoxygenation by different approaches of EPR spectroscopy
Vyacheslav L. Yurpalov, Aleksandr A. Nepomnyashchii, Aleksandr V. Lavrenov
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引用次数: 0
Abstract
The effect of WO3 modifier content (0–25 wt%) for a series of bifunctional Pt/WO3–Al2O3 catalysts (0.5 wt% Pt) for the hydrodeoxygenation of vegetable oil on the concentration of acid sites and the tendency to deactivation was studied using classical and probe EPR methodologies, as well as thermal analysis. It was found that high Brønsted acid sites (BAS) concentration, determined by probe EPR with perylene molecules, promotes more intense side processes of carbon deposit formation with paramagnetic sites in the structure. A probable mechanism for the formation of EPR-detectable carbon sites through cracking, cyclization, condensation, and aromatization reactions involving carbocations is proposed. The possibility of oxidative regeneration of active BAS in catalysts with EPR monitoring is demonstrated.
期刊介绍：
Research on Chemical Intermediates publishes current research articles and concise dynamic reviews on the properties, structures and reactivities of intermediate species in all the various domains of chemistry.
The journal also contains articles in related disciplines such as spectroscopy, molecular biology and biochemistry, atmospheric and environmental sciences, catalysis, photochemistry and photophysics. In addition, special issues dedicated to specific topics in the field are regularly published.
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