Catalyst for the dehydroaromatisation of methane and mixtures containing methane

A calcined MFI or MWW zeolite catalyst which comprises molybdenum and at least one element selected from the group consisting of Cu, Ni, Fe, Co, Mn, Cr, Nb, Ta, Zr, V, Zn, and Ga, prepared by a process comprising:

• (I) treating a MFI or MWW zeolite with a mixture comprising at least one ammonium salt selected from the group consisting of ammonium carbonate, ammonium hydrogencarbonate, ammonium nitrate, ammonium acetate, ammonium phosphate, ammonium hydrogenphosphate, ammonium dihydrogenphosphate, ammonium sulfate, and ammonium hydrogensulfate, and subsequently drying and calcining the zeolite, to produce a primary zeolite;
• (II) treating the primary zeolite with a mixture comprising at least one ammonium salt selected from the group of ammonium carbonate, ammonium hydrogencarbonate, ammonium nitrate, ammonium acetate, ammonium phosphate, ammonium hydrogenphosphate, ammonium dihydrogenphosphate, ammonium sulfate, and ammonium hydrogensulfate, and subsequently drying the zeolite, to produce a secondary zeolite;
• (III) applying a solution comprising molybdenum, at least one element selected from the group consisting of Cu, Ni, Fe, Co, Mn, Cr, Nb, Ta, Zr, V, Zn, and Ga, and a complexing agent, to the secondary zeolite, to produce a catalyst precursor;
• and
• (IV) calcining the catalyst precursor.