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Effect of support-active phase interactions on the catalyst activity and selectivity in deoxygenation of triglycerides
Authors: Kubička David | Horáček Jan | Setnička Michal | Bulánek Roman | Zukal Arnošt | Kubičková Iva
Year: 2014
Type of publication: článek v odborném periodiku
Name of source: Applied catalysis B: Enviromental
Publisher name: Elsevier Science BV
Place: Amsterdam
Page from-to: 101-107
Titles:
Language Name Abstract Keywords
cze Efekt interakce mezi nosičem a aktivní fází na katalytickou aktivitu a selektivitu v deoxygenaci triglyceridů Byly testovány tři průmyslově důležité nosiče NiMo katalyzátorů a to SiO2, TiO2 a Al2O3 pro použití v deoxygenaci řepkového oleje v přítomnosti vodíku při teplotách 260-300 C. deoxygenace; rostlinný olej; efekt nosiče; NiMo katalyzátory
eng Effect of support-active phase interactions on the catalyst activity and selectivity in deoxygenation of triglycerides Three industrially important supports, SiO2, TiO2 and Al2O3, were used for preparation of NiMo catalysts (3.3 wt.% Ni and 15.0 wt.% Mo) and used in deoxygenation of rapeseed oil in presence of hydrogen (3.5 MPa) at 260-300 degrees C and liquid feed weight-hourly space velocity in the range 2-8 h(-1). Due to the same method of preparation and activation (sulfidation) of the catalysts, the final properties were affected mainly by the differences in the nature of supports as well as their properties, such as specific surface area, pore size distribution or acidity. Most notably the dispersion of the active phase decreased in the following order SiO2 > Al2O3 >TiO2. As a result, the SiO2-supported NiMo catalyst exhibited smaller extent of hydrogenation reactions and a larger extent of decarboxylation. On the other hand, the TiO2-supported NiMo catalyst exhibited increased selectivity to hydrodeoxygenation products, plausible due to the larger active phase cluster size and broad pore size distribution. The results provide clear evidence that even with the conventional hydrotreating active phase, such as sulfided NiMo, the selectivity can be fine-tuned by support selection and modification. deoxygenation; vegetable oils; effect of support; supported NiMo catalysts

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