n ‐dodecane hydroconversion over nickel supported on different mesoporous aluminosilicates

Several 2.0 wt% nickel catalysts supported on nanometer bimodal mesoporous aluminosilicate (NBMAS), AlHMS and AlMCM‐41 were prepared by means of the wetness impregnation method. The characterization techniques such as Py‐FTIR and H 2 chemisorption showed that the amount of Brönsted acid sites decreased in the order of Ni/AlHMS > Ni/AlMCM‐41> Ni/NBMAS, while the nickel dispersion differed a little. In the catalytic n ‐dodecane hydroconversion, the highest conversion was obtained over Ni/NBMAS, and the lowest isomerization selectivity occurred over Ni/AIHMS. For the cracked products, the symmetrical carbon number distribution centered at C 6 was obtained on the Ni/AlMCM‐41 catalyst due to the well balanced metall/acid functions, whereas the Ni/AlHMS and Ni/NBMAS catalysts led to more C 3 ‐C 5 and C 1 +C 11 products, respectively.