Roles of Promoter and Support of Sulfided Mo-based Catalyst in Selective Hydrotreating of Palm Fatty Acid Distillate

A series of CoMo/A1203 catalysts with various Co/Mo mole ratios and a series of CoMo/TiO2-A1203 catalysts supported on TiO2 coating Al2O3 were prepared. The effects of Co/Mo mole ratio and TiO2 loadings on Al2O3 on hydrodeoxygenation (HDO) and decarboxylation/decarbonylation (DCO) in the hydrotreating of palm fatty acid distillate (PFAD) were investigated. The catalysts were characterized by BET, XRF, pulse NO chemisorption, and H2-TPR. The maximum yields of n-C16 and n-C18 was observed at Co/Mo = 0.05 for the CoMo/A1203 series, and the yield of n-C15 and n-C17 was increased at Co/Mo > 0.05. CoMoS phase apparently has both HDO and DCO activities. CoMo(0.05)/Ti(20)-Al showed the maximum yields of n-C16 and n-C18 due to the formation of TiMoS in all catalysts. TiMoS phase may be formed by adding TiO2 on Al2O3 and promotes the HDO reaction, but not isomerization or cracking.

Automated summary

The effects of Co/Mo mole ratio and TiO2 loadings on hydrodeoxygenation and decarboxylation/decarbonylation reactions in the hydrotreating of PFAD were investigated. CoMoS phase exhibited both HDO and DCO activities, while the addition of TiO2 to form TiMoS phase promoted the HDO reaction.