Effects of Si/Al ratio and Pt loading on Pt/SAPO-11 catalysts in hydroconversion of Jatropha oil

• Published in: Applied catalysis. A, General Vol. 466; pp. 105 - 115
• Main Authors: Chen, Ning, Gong, Shaofeng, Shirai, Hisakazu, Watanabe, Toshitaka, Qian, Eika W.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 10.09.2013; Elsevier
• Subjects: Aluminum; Catalysis; Catalysts; Chemistry; Deoxygenation; Exact sciences and technology; Fracture mechanics; General and physical chemistry; Isomerization; Jatropha oil hydroconversion; Methyl oleate; Platinum; Pt loading; SAPO-11; Si/Al ratio; Silicon; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Methyl oleate; Jatropha oil hydroconversion; SAPO-11; Pt loading; Si/Al ratio; Heterogeneous catalysis; Oil; Catalyst
• ISSN: 0926-860X; 1873-3875
• DOI: 10.1016/j.apcata.2013.06.034

•Hydroconversion of Jatropha oil into iso-paraffin was achieved in one catalytic step.•The medium acid sites in SAPO-11 increased with the increase of Si/Al ratio.•Hydrotreatment of Jatropha oil was performed at various LHSV and Si/Al.•The mechanism of hydroconversion of methyl oleate was investigated.•A reaction network for hydroconversion of Jatropha oil was suggested. A series of Pt/SAPO-11 catalysts were prepared with various Si/Al ratios and Pt loadings and characterized by using BET, XRD, XRF, and CO pulse adsorption, as well as 29Si NMR and NH3-TPD techniques. Their catalytic performances in hydroconversion of Jatropha oil were tested with a fixed-bed flow reactor system. The isomerization activity increased with the Si/Al ratio because there were more medium acidic sites on the SAPO-11 supports. Pt/SAPO-11 catalysts with a Si/Al ratio of 0.4 demonstrated high activity for both deoxygenation and isomerization among catalysts with the same Pt loading. The deoxygenation, isomerization and cracking activities strongly depended on the Pt loading. The best activity was observed for the sample with a 3wt% Pt loading, which generated an 83% yield of iso-C15-18 hydrocarbons under the LHSV of 0.5h−1. Based on the mechanistic study of hydroconversion of methyl oleate, a reaction network for the hydroconversion of Jatropha oil was suggested.