A porous, crystalline material is described having the framework structure of
ZSM-12
and a composition involving the molar relationship:
wherein X is a trivalent element, Y is a tetravalent element and n is less
than 60. The material has an average crystal size of the material is less than
0.1 micron and a Diffusion Parameter for mesitylene of at least 100010-6
sec-1 when measured at a temperature of 100 C. and a mesitylene
pressure of 2 torr.
