CHA type zeolitic materials and methods for their preparation

A process for preparing a zeolitic material having a CHA-type framework structure comprising YO2 and X2O3, wherein the process comprises:

• providing a mixture comprising one or more sources for YO2, one or more sources for X2O3, one or more tetraalkylammonium cation R1R2R3R4N+-containing compounds, and one or more tetraalkylammonium cation R5R6R7R8N+-containing compounds as structure directing agent;
• and
• crystallizing the mixture to obtain a zeolitic material having a CHA-type framework structure;
• wherein Y is a tetravalent element and X is Al,
• wherein R1, R2, R3, R5, R6, and R7 stand for methyl,
• wherein R4 is chosen from CnH2nOH and n ranges from 1 to 6,
• wherein R8 stands for cyclohexyl,
• wherein a molar ratio R1R2R3R4N+:YO2 of the one or more tetraalkylammonium cation R1R2R3R4N+-containing compounds to YO2 ranges from 0.1 to 0.5,
• wherein a molar ratio R5R6R7R8N+:YO2 of the one or more tetraalkylammonium cation R5R6R7R8N+-containing compounds to YO2 ranges from 0.11 to 0.21,
• wherein the one or more sources for X2O3 comprises one or more compounds selected from the group consisting of aluminum tri (C2-C3)alkoxide, AlO(OH), Al(OH)3, aluminum chloride, aluminum sulfate, and mixtures of two or more thereof, and
• wherein a molar ratio R1R2R3R4N+:R5R6R7R8N+ of the one or more tetraalkylammonium cations R1R2R3R4N+ to the one or more tetraalkylammonium cations R5R6R7R8N+ in the mixture of the providing step ranges from 0.5 to 0.9.