Two series of supports, SAPO-11 (Si/Al: 0−0.4) and alumina-coated SBA-15 (Al 2 O 3 : 0−20 wt %), with different pore structures were synthesized. Subsequently, the PtSn bimetallic catalysts supported on these supports were prepared using a coimpregnation method and were characterized by N 2 adsorption measurement, pyridine-adsorbed Fourier transform infrared, CO chemisorption, and H 2 -TPR. The catalytic performances of the catalysts in the hydrotreatment of palm fatty acid distillate (PFAD) were tested using a fixed-bed flow reactor system. PtSn/ALPO-11 (Si/Al: 0) showed the highest n-C 16,18 selectivity (66.4%) among the SAPO-11-based catalysts, and PtSn/20Al/SBA-15 (20% Al 2 O 3 ) showed the highest n-C 16 , n-C 18 selectivity (61.5%) among the SBA-15-based catalysts. It was found that higher Brønsted acid content on the catalyst showed higher isomerization selectivity. Based on the comparison of PtSn/SAPO-11 (0.1) and PtSn/10Al/ SBA-15, the mesoporous structure favored hydrodeoxygenation activity. Also, it was suggested that Brønsted acid affected the structure of active sites and highly dispersed Pt favored formation of n-hexadecane and n-octadecane.

A series of CoMo/Al2O3 catalysts with various Co/Mo mole ratios and a series of CoMo/TiO2 _ Al2O3 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/Al2O3 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.