Synthesis of crystalline ZSM-23

A method for synthesizing crystalline material exhibiting a characteristic X-ray diffraction pattern including d-spacing maxima values as shown in Table 1, which comprises (i) preparing a mixture capable of forming said material, said mixture comprising sources of alkali or alkaline earth metal (M), an oxide of trivalent element (X), an oxide of tetravalent element (Y), water and directing agent (R) of the formula (CH.sub.3).sub.3 N.sup.+ CH.sub.2 CH.sub.2 CH.sub.2 N.sup.+ (CH.sub.3).sub.2 CH.sub.2 CH.sub.2 CH.sub.2 N.sup.+ (CH.sub.3).sub.3, and having a composition, in terms of mole ratios, within the following ranges;

• ______________________________________ YO.sub.2 /X.sub.2 O.sub.3 30 to 300 H.sub.2 O/YO.sub.2 20 to 100 OH.sup.- /YO.sub.2 0.1 to 0.4 M/YO.sub.2 0.05 to 1.0 R/YO.sub.2 0.02 to 1.0 ______________________________________
• (ii) maintaining said mixture under sufficient conditions including a temperature of from about 150.degree. C. to about 190.degree. C. until crystals of said material are formed;
• and (iii) recovering said crystalline material from step (ii), said recovered crystalline material containing said R.