A novel composite support for hydrotreating catalyst aimed at ultra-clean fuels

To produce ultra-clean fuel, a well-designed composite support, the unique combination of titanosilicate ETS-10 and aluminophosphate AlPO4-5 with alumina, was firstly developed. Compared with pure alumina, it owns a certain amount of B type acid sites of moderate acid strength, contributing to the removal of refractory 4,6-DMDBT effectively. Moreover, it can impede inactive nickel spinel formation, improve metal–support interactions and favor more polymeric tungsten species formation, which facilitates the promotion effect of nickel on tungsten. With FCC diesel (sulfur: 960.0 μg g−1 and aromatics: 51.0 vol.%) as feed, the clean diesel product (sulfur: 2.7 μg g−1 and aromatics: 15.0 vol.%) without much over-cracking fractions, can be obtained over the composite support based catalyst, at 8.0 MPa, 633 K, LHSV of 1 h−1, H2/oil ratio of 500 (v/v).