Abstract
To promote selectivity of jet fuel products in deoxygenation and cracking of microalgal biodiesel in CO2 atmosphere, terephthalic acid (BDC) was hydroxylated to prepare Ni-based metal–organic frameworks (Ni-MOFs) as efficient bifunctional catalysts to convert methyl palmitate into jet-fuel range hydrocarbons. The strong acid concentration of Ni-MOF catalyst increased from 0 to 0.75 mmol/g and active nickel atom content increased from 5.05 to 5.70% after BDC hydroxylation, due to enhanced coordinative unsaturated properties of nickel metal center. The Brunauer-Emmett- Teller surface area of Ni-MOFs catalyst increased from 57.6 to 901 m2/g after BDC hydroxylation. The deoxygenation occurred more readily than bond cracking of methyl palmitate, while C = C bond migration and lactonization were key steps in cycloalkane formation. The selectivity of jet-fuel range hydrocarbons products over BDC-hydroxylated MOF (Ni-DOBDC) catalyst increased from 68 to 82 %.
Published Version
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