Abstract: The present invention relates to a process for the rapid synthesis of an AFX-structure zeolite comprising at least: i) mixing, in an aqueous medium, a FAU-structure zeolite having an SiO2 (FAU)/Al2O3 (FAU) molar ratio of between 2.00 and 100, a nitrogen-containing organic compound R, at least one source of at least one alkali and/or alkaline-earth metal M of valence n, with the following molar composition: (SiO2 (FAU))/(Al2O3 (FAU)) between 2.00 and 100, H2O/(SiO2 (FAU)) between 1 and 100, R/(SiO2 (FAU)) between 0.01 and 0.6, M2/nO/(SiO2(FAU)) between 0.005 and 0.45, wherein SiO2 (FAU) denotes the amount of SiO2 provided by the FAU zeolite and Al2O3 (FAU) denotes the amount of Al2O3 provided by the FAU zeolite, until a homogeneous precursor gel is obtained; ii) hydrothermally treating said precursor gel obtained at the end of step i) under autogenous pressure at a temperature of between 120° C. and 250° C., for 4 to 12 hours.

Abstract: The invention relates to a catalyst comprising a mixture of AFX-structure and BEA-structure zeolites and at least one additional transition metal, to the process for preparing same and to the use thereof for the selective catalytic reduction of NOx in the presence of a reducing agent such as NH3 or H2.

Abstract: The invention relates to a process for preparing an AFX-structure zeolite comprising at least the following steps: i) mixing, in an aqueous medium, an FAU-structure zeolite having an SiO2 (FAU)/Al2O3 (FAU) molar ratio of between 2.00 (limit included) and 6.00 (limit excluded), an organic nitrogenous compound R, at least one source of at least one alkali and/or alkaline-earth metal M, the reaction mixture having the following molar composition: (SiO2 (FAU))/(Al2O3 (FAU)) between 2.00 (limit included) and 6.00 (limit excluded), H2O/(SiO2 (FAU)) between 1 and 100, R/(SiO2 (FAU)) between 0.01 and 0.6, M2/nO/(SiO2 (FAU)) between 0.005 and 0.7, limits included, until a homogeneous precursor gel is obtained; ii) hydrothermal treatment of said precursor gel obtained on conclusion of step i) at a temperature of between 120° C. and 220° C., for a time of between 12 hours and 15 days.

Abstract: The invention relates to a process for preparing a catalyst based on an AFX zeolite exchanged with at least one transition metal, comprising at least the following steps: i) mixing, in an aqueous medium, of at least one source of silicon (Si) in SiO2 oxide form, at least one source of aluminum (Al) in Al2O3 oxide form, 1,6-bis(methylpiperidinium)hexane dihydroxide, and at least one source of at least one alkali metal, until a homogeneous precursor gel is obtained; ii) hydrothermal treatment at a temperature between 75° C. and 95° C., limits included; iii) at least one ion exchange with a solution comprising at least one species capable of releasing a transition metal, iv) heat treatment by drying followed by at least one calcination under a stream of air at a temperature between 400 and 700° C. The invention also relates to the catalyst obtained and to the use thereof for the selective reduction of NOx.

Abstract: The invention relates to a process for synthesizing a high-purity AFX zeolite, comprising at least the following steps: i) mixing, in an aqueous medium, of at least one source of silicon (Si) in SiO2 oxide form, at least one source of aluminum (Al) in Al2O3 oxide form, a nitrogenous organic compound of 1,6-bis(methylpiperidinium)hexane dihydroxide type, and at least one source of at least one alkali metal chosen from lithium, potassium or sodium, and the mixture of at least two of these metals, until a homogeneous precursor gel is obtained; ii) hydrothermal treatment of said precursor gel obtained at the end of step i) at a temperature of between 75° C. and 95° C., limits included, for a period of between 40 and 100 hours, limits included, to obtain a solid AFX-structure crystalline phase, termed “AFX zeolite”. The invention also relates to the high-purity AFX zeolite obtained.

Abstract: The present invention relates to a process for the rapid synthesis of an AFX-structure zeolite comprising at least: i) mixing, in an aqueous medium, a FAU-structure zeolite having an SiO2 (FAU)/Al2O3 (FAU) molar ratio of between 2.00 and 100, a nitrogen-containing organic compound R, at least one source of at least one alkali and/or alkaline-earth metal M of valence n, with the following molar composition: (SiO2 (FAU))/(Al2O3 (FAU)) between 2.00 and 100, H2O/(SiO2 (FAU)) between 1 and 100, R/(SiO2 (FAU)) between 0.01 and 0.6, M2/nO/(SiO2(FAU)) between 0.005 and 0.45, wherein SiO2 (FAU) denotes the amount of SiO2 provided by the FAU zeolite and Al2O3(FAU) denotes the amount of Al2O3 provided by the FAU zeolite, until a homogeneous precursor gel is obtained; ii) hydrothermally treating said precursor gel obtained at the end of step i) under autogenous pressure at a temperature of between 120° C. and 250° C., for 4 to 12 hours.

Abstract: The invention relates to a process for preparing a catalyst based on a zeolite of AFX structural type and on at least one transition metal, comprising at least the following steps: i) mixing, in an aqueous medium, of at least one source of silicon in oxide form SiO2, of at least one source of aluminium in oxide form Al2O3, of an organic nitrogen-comprising compound R, of at least one source of at least one alkali metal and/or alkaline-earth metal M until a homogeneous precursor gel is obtained; ii) hydrothermal treatment of said precursor gel to obtain a crystallized solid phase, iii) at least one ion exchange with a transition metal; iv) heat treatment. The invention also relates to the catalyst capable of being obtained or directly obtained by the process and to the process for the selective reduction of NOx employing the catalyst.

Abstract: The invention concerns a process for preparing a copper-comprising SAPO material with AFX structure, comprising at least the steps of mixing, in an aqueous medium, at least one aluminum source, at least one silicon source, at least one copper source, at least one phosphorus source, a TETA complexing agent and a TMHD structuring agent, in order to obtain a gel, and hydrothermal treatment of said gel with a shear rate of less than 50 s?1 in order to obtain crystallization of said copper-comprising SAPO material with AFX structure.

Abstract: The invention relates to a catalyst comprising a mixture of AFX-structure and BEA-structure zeolites and at least one additional transition metal, to the process for preparing same and to the use thereof for the selective catalytic reduction of NOx in the presence of a reducing agent such as NH3 or H2.

Abstract: The invention relates to a process for preparing an AFX-structure zeolite comprising at least the following steps: i) mixing, in an aqueous medium, an FAU-structure zeolite having an SiO2 (FAU)/Al2O3 (FAU) molar ratio of between 2.00 (limit included) and 6.00 (limit excluded), an organic nitrogenous compound R, at least one source of at least one alkali and/or alkaline-earth metal M, the reaction mixture having the following molar composition: (SiO2 (FAU))/(Al2O3 (FAU)) between 2.00 (limit included) and 6.00 (limit excluded), H2O/(SiO2 (FAU)) between 1 and 100, R/(SiO2 (FAU)) between 0.01 and 0.6, M2/nO/(SiO2 (FAU)) between 0.005 and 0.7, limits included, until a homogeneous precursor gel is obtained; ii) hydrothermal treatment of said precursor gel obtained on conclusion of step i) at a temperature of between 120° C. and 220° C., for a time of between 12 hours and 15 days.

Abstract: The invention concerns a process for preparing a copper-comprising microporous aluminosilicate material with AFX structure, comprising at least the steps of mixing, in an aqueous medium, at least one aluminum source, at least one silicon source, at least one copper source, a TETA or TEPA organic complexing agent and a DABCO-C4 structuring agent, in order to obtain a gel, and hydrothermal treatment of said gel with stirring in order to obtain crystallization of said copper-comprising microporous aluminosilicate material with AFX structure.

Abstract: The invention concerns a process for preparing a copper-comprising microporous aluminosilicate material with AFX structure, comprising at least the steps of mixing, in an aqueous medium, at least one aluminum source, at least one silicon source, at least one copper source, a TETA or TEPA organic complexing agent and a DABCO-C4 structuring agent, in order to obtain a gel, and hydrothermal treatment of said gel with stirring in order to obtain crystallization of said copper-comprising microporous aluminosilicate material with AFX structure.

Abstract: The invention concerns a process for preparing a copper-comprising SAPO material with AFX structure, comprising at least the steps of mixing, in an aqueous medium, at least one aluminum source, at least one silicon source, at least one copper source, at least one phosphorus source, a TETA complexing agent and a TMHD structuring agent, in order to obtain a gel, and hydrothermal treatment of said gel with a shear rate of less than 50 s?1 in order to obtain crystallization of said copper-comprising SAPO material with AFX structure.