Development in catalysts for one-step hydrogenation of bio-jet fuels
Compared with the two-step process for bio-jet fuel production,the one-step process has the advantages of low cost,simple reaction and low energy consumption.The key to the efficient production of jet fuel by one-step process is the selection of catalysts,which need to have the integrated ability of hydrodeoxygenation,isomerization,and selective cracking.This work reviews the selection and preparation of bifunctional catalysts for the one-step hydrogenation of vegetable oil to jet fuel in recent years,and introduces the contribution of acid center and metal center to the reaction in the bifunctional catalysts.Microporous zeolites with 10-ring pores have unique selectivity for isomeric hydrocarbons.Compared with mesoporous materials,microporous zeolite provides larger diffusion resistance of reactants and products.Therefore,the synthesis of hierarchical porous materials or meso-microporous composites is a preferred choice of catalyst supports for future catalysts.The effect of active metal on the catalytic reactivity is also explored.The bimetallic,transition metals,transition metal sulfides and transition metal phosphides catalysts exhibit superior performance and cost reduction,compared to noble metals catalysts.Finally,the effect of catalyst preparation methods on the dispersion of active species is explored.Catalysts supported by highly dispersed transition metals exhibit excellent reactivity.
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