Aluminosilicates having a zeolite structure, and process for the manufacture thereof

摘要

The invention provides a process for the manufacture of a crystalline, phosphorus-containing zeolite of the ZSM-5 type by mixing water, a silicon dioxide source, an alkali metal hydroxide and an aluminum compound, and reacting this mixture at a temperature of from 95 DEG to 230 DEG C. until the zeolite has crystallized, which comprises carrying out the reaction without addition of an organic compound but in the presence of aluminum phosphate. The zeolite obtained has the following molar ratios: SiO2:Al2O3 from 15 to 200, M2O:SiO2 from 10-6 to 1 and H2O:SiO2 from 0 to 40 (M being an alkali metal). It is free from organic compounds and contains phosphate in a molar ratio of P2O5:SiO2 of from 10-5 to 0.1. X-ray diffraction patterns are indicated.