Mesoporous aluminosilicates with a Si/Al ratio of 5 to 20, a pore diameter of 30 to 84 angstrom, and a specific surface area up to 1030 cm(3)/g have been prepared using hexadecylamine and Pluronic P-123 as templates. These materials exhibit high activity in the cracking of hydrotreated vacuum gas oil. Bifunctional catalysts derived on their basis have high selectivity in the hydroisomerization of hexadecane.