Method for preparing zeolite catalyst

A method for manufacturing a zeolite catalyst, the method comprising steps of:

• manufacturing a first LTA zeolite, which includes first ions, using an LTA seed;
• manufacturing a second LTA zeolite including ions by substituting second ions in place of ions in the first LTA zeolite;
• and
• manufacturing an iron LTA zeolite by substituting iron ions in place of the second species ions in the second LTA zeolite.

A method for manufacturing a zeolite catalyst, the method comprising:

• preparing a first mixture by mixing a 1,2-dimethyl-3-(4-methylbenzyl)imidazolium hydroxide aqueous solution, aluminum hydroxide (Al(OH)3), and tetramethylammonium hydroxide pentahydrate;
• preparing a second mixture by mixing tetraethyl orthosilicate (TEOS) (Si(OC2H5)4) into the first mixture and then mixing an LTA seed thereto;
• preparing a third mixture by evaporating ethanol and water contained in the second mixture;
• preparing a first LTA zeolite by mixing a hydrofluoric aqueous solution into the third mixture, heating, and then performing drying;
• preparing a second LTA zeolite including NH4+ ions by mixing the first LTA zeolite with an ammonium nitrate (NH4NO3) solution to react them and then drying;
• and
• preparing a third LTA zeolite by mixing the second LTA zeolite with copper acetate monohydrate solution to react them and then performing drying.