33008 ⎘
Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites; Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups - containing rare earth elements, titanium, zirconium, hafnium, zinc, cadmium, mercury, gallium, indium, thallium, tin or lead MAZ-type, e.g. Mazzite, Omega, ZSM-4 or LZ-202