SCR catalyst

A one-pot synthesis method for making a catalyst composition comprising a zeolite having a CHA framework, a molar silica-to-alumina ratio (SAR) of 45 to 85, and an atomic copper-to-aluminium ratio of at least 1.25, which method comprising forming a reaction mixture containing a source of silica, a source of alumina, a first CHA framework organic templating agent in the form of a copper metal-amine, a second distinct organic CHA templating agent, and seed crystals;

• heating the reaction mixture to facilitate crystallization and precipitation of the crystals of the catalyst composition;
• and collecting, washing and drying the crystals.