Abstract
Hydrodeoxygenation of vegetal oil and methyl oleate studied using Pt and Pd supported with alumina-beta-zeolite (a-Al2O3-H-a) and comparing its performance with NiMo/a-Al2O3 and Pd/C in a semi-batch reactor, at 300 - 340 oC and 2.0 MPa. This study has used Pd and Pt on H-a zeolites with alumina binder as extrudate and it examines over triglycerides hydrogenolysis. Pd/C showed higher rate of deoxygenation and the selectivity of C18/C17 was higher for NiMo-S/a-Al2O3 and PdPt/a-Al2O3-H-a. PdPt/a-Al2O3-H-a enhanced the hydrogenation and hydrogenolysis, while conversion and yield in deoxygenation and decomposition has reached identicical performance as NiMo-S/a-Al2O3 catalytic deoxygenation process. Both the thermal decomposition and the hydrogenation of unsaturated triglycerides were mainly affected by H2 partial pressure. Transition metals like Pd and Pt on H-a and alumina binder ratio of 40:60 wt% showed effective hydrodeoxygenation of vegetal oil without substituting sulfur feed.
Highlights
In the present scenario, few refineries are involved in producing biomass based diesel-like fuel, named as renewable diesel, to replace the conventional one [1-5]
Pt can emphasis the reduction of hydrocarbon and Pd can increase the capability of H-proton donor potential due to the strong interaction of Pd atom with the zeolite atoms
The experimental investigation has been performed for Pd/C, bi-metallic catalysts like NiMo on alumina and PtPd on the alumina-zeolite
Summary
Few refineries are involved in producing biomass based diesel-like fuel, named as renewable diesel, to replace the conventional one [1-5]. In the search of sulphur-free catalyst, there were possibilities to use alumino-silicates or zeolites, such as Zeolite Socony Mobil (ZSM), mesoporous zeolite (SBA), Hydrogen-Beta (H-β), Y-type (H-Y), Silicoaluminophosphate (SAPO) and Mobil Composition Materials (MCM) in catalytic hydrotreatment of vegetal oil [18] These materials with significant metal loads, are mainly involved in HDO and branching of hydrocarbon chains (they reduce cold flow plugging point) [25]. Like γ-Al2O3, the study mainly reveals that the zeolite-type metal oxides could be thermally stable, enhancing branching in hydrocarbon and increasing HDO yield In this context, zeolite-type catalyst might be suitable for catalytic hydrotreatment of raw vegetal oil. Pt can emphasis the reduction of hydrocarbon and Pd can increase the capability of H-proton donor potential due to the strong interaction of Pd atom with the zeolite atoms Both Pt and Pd are recommended to be used as a sulphur-free catalyst for investigating hydrotreatment of vegetal oil [26]. The study focus on HDO and DCA mechanism in OLP and the composition of fuel gas in the gas outlet
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