| Modified Pt/Al-MCM-41 was prepared by loading Pt after 0.25 mol/L citric acid impregnation. The modified catalyst was characterized by XRD, TEM, XRF, NH3-TPD and Py-IR. Using Jatropha curcas L. seed oil as raw material, the biofuels was prepared by one-step hydrogenation in a high pressure fixed bed under the conditions of airspeed 1.0 h-1, hydrogen-oil ratio 1 000, pressure of hydrogen 4 MPa, dosage of citric acid modified Pt/Al-MCM-41 catalyst 6 mL and different temperatures, and the product was analyzed by GC-MS. The results showed that citric acid reduced the order degree of molecular sieve framework, part of Al was removed, and the specific surface area decreased, but the pore volume and pore size of the catalyst increased, micropores was formed, and the acidity also significantly changed. When the hydrogenation temperature was 360 ℃, the deoxygenation rate was 87.11%, the relative contents of C9-C14 alkanes, C15-C16 alkanes, C8-C16 isomeric alkanes, C8-C16 aromatics and C17-C18 alkanes were 559%, 34.55%, 14.12%, 3.12% and 60.48%， respectively. The citric acid modified Pt/Al-MCM-41 had low selectivity to the short-chain alkanes in catalyzing the hydrogenation reation of Jatropha curcas L. seed oil. |
