Catalytic deoxygenation of stearic acid and waste cooking oil over Pd/SBA-15 for obtaining hydrocarbons with potential as renewable liquid fuels
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It has been found that catalytic deoxygenation of triglycerides is a viable pathway for obtaining renewable liquid fuels to contribute to meet the global energy demand. In this study, SBA-15 mesoporous silica was synthesized in a pure form and modified with mesitylene (TMB) as a swelling molecule (SBA15-TMB). Catalysts with 0.5, 1.5 and 3.0 wt% Pd were synthesized and tested by deoxygenation of stearic acid (SA), obtaining initial conversions of 68–98% that decreased to 36–73% after 6 h time-on-stream. The most abundant product was n-heptadecane, with a selectivity of ~ 90%. The most active catalyst evaluated with SA was 3.0 wt% Pd over unmodified SBA-15 (30Pd/SBA-15). Subsequently, fresh and regenerated 30Pd/SBA-15 catalysts were tested with waste cooking oil (WCO) feed, obtaining conversions of 74 and 72%, respectively, but the fresh catalyst allowed a better oxygen removal (91%. Additionally, commercial Pd(10wt %)/C catalyst was evaluated, obtaining results comparable to those for the regenerated 30Pd/SBA-15 catalyst. The main WCO reaction product for all catalysts was a diesel fraction (C12-C21), and the quality of the products was not very different, following the order: Pd(10wt %)/C > 3.0Pd/SBA-15-regenerated > 3.0Pd/SBA-15-fresh. The results obtained indicate that shynthetized catalysts of this study are promising for obtaining renewable diesel from low-cost feeds while using low hydrogen consumption.
KeywordsSBA-15 Catalytic deoxygenation Stearic acid Waste cooking oil Palladium Trimethylbenzene
This work was supported by Consejo Nacional de Ciencia y Tecnología (CONACYT) [Project of Basic Science No. 166640]; Bioenergy Thematic Network (“Red Temática de Bioenergía”), [Grant 260457]. Project 253986 is acknowledged for CHNS/O analyzes. Jose Gpe. Pacheco S. acknowledges the Programa para el Desarrollo Profesional Docente (PRODEP) (SEP -SES) and Universidad Juárez Autónoma de Tabasco for the scholarship and financial support for his doctoral studies.
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