combination of mtt and gon zeolites may also be used in layers the use of catalyst layers is disclosed in u s pat no 5 149 421 issued sept 22 1992 to miller which is incorporated by reference herein its entirety the order of the layers may be mtt in a first layer and gon in a subsequent layer or vice versa depending upon the nature of the feed and the desired products the mtt and gon zeolites can be employed over a wide range of concentrations the catalyst combination may comprise 1 99 weight percent mtt zeolite and 99 1 weight percent gon zeolite preferably the crystal size of the zeolites is less than 0 1 micron i e the longest dimension of the crystal is less than 0 1 micron the crystalline mtt and gon can be used as synthesized but preferably will be thermally treated calcined usually it is desirable to remove the alkali metal cation by ion exchange and replace it with hydrogen ammonium or any desired metal ion the zeolite can be leached with chelating agents e g edta or dilute acid solutions to increase the silica to alumina mole ratio the zeolite can also be steamed steaming helps stabilize the crystalline lattice to attack from acids the zeolite can be used in intimate combination with hydrogenating components such as tungsten.