Mordenite type zeolite and its preparation process

A process for making a synthetic crystalline mordenite zeolite having:

• a) the following approximate general formula:
• Na.sub.2 O:
• Al.sub.2 O.sub.3 :
• xSiO.sub.2
• where x is a number ranging from 9 to 30,
• an X-ray diffraction pattern as follows
• ______________________________________ 2 .theta. (.degree.) d.sub.hkl (.ANG.) I/Io ______________________________________ 6.38 13.84 mF 8.50 10.39 mf 9.60 9.21 F 13.38 6.61 mF 13.70 6.46 m 14.35 6.17 ff 15.10 5.86 f 19.48 4.55 mF 20.72 4.28 ff 22.15 4.01 F 23.00 3.86 ff 23.50 3.78 f 24.30 3.66 ff 25.55 3.48 FF 26.20 3.398 F 27.65 3.223 mF 30.75 2.905 m 32.6 2.744 ff 33.08 2.706 ff 34.93 2.566 ff 35.55 2.523 f 40.39 2.231 ff 44.3 2.088 f ______________________________________
• and
• c) a fluorine content ranging from about 0.005% to 20%,
• said process comprising reacting in a dissolved reaction mixture at least one source of sodium cations, at least one source of aluminum, at least one source of silica, and at least one source of a silica mobilizing agent containing fluoride ions at a pH lower than about 9 to obtain said crystalline mordenite zeolite.