A FAST BATCH PROCESS FOR PREPARING A ZEOLITIC MATERIAL HAVING FRAMEWORK TYPE CHA

摘要

A batch process for preparing a zeolitic material having framework type CHA and a framework structure comprising Si, Al, O, and H, comprising (i) providing a seeding material comprising a zeolitic material having framework type CHA and a framework structure comprising Si, Al, O, and H; (ii) preparing a mixture comprising a source of Si, a source of Al, a seeding material provided in (i), a CHA framework structure directing agent comprising a cycloalkylammonium compound, and water, wherein the cycloalkylammonium compound is a compound comprising a cation R¹R²R³R⁴N⁺ wherein R¹, R², R³ are, independently from one another, an alkyl residue having from 1 to 6 carbon atoms, and R⁴ is a 5- to 8-membered cycloalkyl residue, wherein in mixture, the molar ratio of water relative to Si comprised in the source of Si and in the seeding material, calculated as SiO₂, is in the range of from 5:1 to 15:1, wherein the mixture, the molar ratio of sodium, calculated as Na₂O, relative to Si comprised in the source of Si and in the seeding material, calculated as SiO₂, is in the range of from 0:1 to 0.1:1; (iii) heating the mixture prepared in (ii) in its liquid state to a temperature of the mixture in the range of from 50 to 90 °C and keeping the liquid mixture at a temperature in this range for 5 to 100 h; (iv) heating the heated mixture of (iii) to a temperature of the mixture in the range of from 190 to 230 °C in a crystallization vessel and keeping the mixture at a temperature in this range under autogenous pressure in the crystallization vessel for 0.5 to 10 h, obtaining a solid material comprising a zeolitic material having framework type CHA and a framework structure comprising Si, Al, O, and H, suspended in its mother liquor.