Copper-promoted GMElinite and use thereof in the selective catalytic reduction of NOX

A catalyst, produced by the process comprising:

• crystallizing a mixture comprising a source of SiO2, a source of Al2O3, and optionally comprising a seed crystal, to obtain a first zeolitic material comprising a GME framework zeolite and a CHA framework zeolite, and/or to obtain a second zeolitic material comprising a zeolite intergrowth phase comprising a GME framework zeolite and a CHA framework zeolite;
• ion-exchanging the first and/or second zeolitic material with Cu and/or Fe;
• and
• obtaining the catalyst which is suitable for selective catalytic reduction of NOx,
• wherein the first and/or second zeolitic material of the catalyst comprises:
• Cu and/or Fe:
• and
• (A) a GME framework zeolite comprising SiO2 and Al2O3 and a CHA framework zeolite comprising SiO2 and Al2O3:
• and/or (B) a zeolite intergrowth phase comprising a GME framework zeolite comprising SiO2 and Al2O3 and a CHA framework zeolite comprising SiO2 and Al2O3, and
• wherein a relative amount of the CHA framework zeolite in the zeolitic material, calculated from an X-ray powder diffraction pattern of the zeolitic material using a Relative Intensity Ratio method, and based on 100% of phases in the zeolitic material comprising the GME and CHA framework zeolite, is in a range of from 10% to 60%;
• and
• wherein the zeolite material has a degree of crystallinity greater than 50%.

A catalyst, comprising a zeolitic material comprising:

• (A) a zeolite having a GME framework structure comprising SiO2 and Al2O3 and a zeolite having a CHA framework structure comprising SiO2 and Al2O3, and/or
• (B) a zeolite intergrowth phase of one or more zeolites having a GME framework structure comprising SiO2 and Al2O3 and one or more zeolites having a CHA framework structure comprising SiO2 and Al2O3,
• wherein the zeolitic material comprises Cu and/or Fe as a non-framework element in a range of from 0.1 wt.-% to 15 wt.-% calculated as an element and based on 100 wt.-% of SiO2 contained in the zeolitic material, and
• wherein the catalyst is suitable for selective catalytic reduction of NOx, and wherein a relative amount of the CHA framework structure in the zeolitic material, calculated from an X-ray powder diffraction pattern of the zeolitic material using a Relative Intensity Ratio method, and based on 100% of phases in the zeolitic material comprising the GME and CHA framework structure, is in a range of from 10% to 60%;
• and
• wherein the zeolite material has a degree of crystallinity greater than 50%.