A process for the direct synthesis of a material with a CHA zeolite structure in the silicoaluminate form thereof containing copper atoms, which comprises at least the following steps: (i) Preparation of a mixture which contains at least - one water source, - one copper source, - one polyamine, selected from tetraethylenepentamine, triethylenetetramine, 1,4,8,11-tetraazacyclotetradecane, 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane and combinations thereof, - one source of Y tetravalent element, which is Si, and one source of X trivalent element, which is Al, characterized in that a zeolite with an FAU structure is the only source of Y and X, - the tetraethylammonium cation as the only OSDA, - and one source of alkaline or alkaline earth cations, selected from a source of Na, K and combinations thereof, and wherein the synthesis mixture has the following molar composition: YO 2: a X 2 O 3: b OSDA: c A: d H 2 O: e Cu: f polyamine wherein a ranges between 0.001 and 0.2; b ranges between 0.01 and 2; c ranges between 0.01 and 0.8; d ranges between 1 and 200; e ranges between 0.001 and 1; f ranges between 0.001 and 1; (ii) Crystallization of the mixture obtained in (i) in a reactor; (iii) Recovery of the crystalline material obtained in (ii). (i) Preparation of a mixture which contains at least - one water source, - one copper source, - one polyamine, selected from tetraethylenepentamine, triethylenetetramine, 1,4,8,11-tetraazacyclotetradecane, 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane and combinations thereof, - one source of Y tetravalent element, which is Si, and one source of X trivalent element, which is Al, characterized in that a zeolite with an FAU structure is the only source of Y and X, - the tetraethylammonium cation as the only OSDA, - and one source of alkaline or alkaline earth cations, selected from a source of Na, K and combinations thereof, and wherein the synthesis mixture has the following molar composition: YO 2: a X 2 O 3: b OSDA: c A: d H 2 O: e Cu: f polyamine wherein a ranges between 0.001 and 0.2; b ranges between 0.01 and 2; c ranges between 0.01 and 0.8; d ranges between 1 and 200; e ranges between 0.001 and 1; f ranges between 0.001 and 1; - one water source, - one copper source, - one polyamine, selected from tetraethylenepentamine, triethylenetetramine, 1,4,8,11-tetraazacyclotetradecane, 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane and combinations thereof, - one source of Y tetravalent element, which is Si, and one source of X trivalent element, which is Al, characterized in that a zeolite with an FAU structure is the only source of Y and X, - the tetraethylammonium cation as the only OSDA, - and one source of alkaline or alkaline earth cations, selected from a source of Na, K and combinations thereof, and wherein the synthesis mixture has the following molar composition: YO 2: a X 2 O 3: b OSDA: c A: d H 2 O: e Cu: f polyamine wherein a ranges between 0.001 and 0.2; b ranges between 0.01 and 2; c ranges between 0.01 and 0.8; d ranges between 1 and 200; e ranges between 0.001 and 1; f ranges between 0.001 and 1; a ranges between 0.001 and 0.2; b ranges between 0.01 and 2; c ranges between 0.01 and 0.8; d ranges between 1 and 200; e ranges between 0.001 and 1; f ranges between 0.001 and 1; (ii) Crystallization of the mixture obtained in (i) in a reactor; (iii) Recovery of the crystalline material obtained in (ii).