Abstract: The invention concerns a process for the isomerization of an aromatic C8 cut using a catalyst containing mordenite, cerium and at least one metal from group VIII. It also concerns a catalyst containing 2-98% by weight of mordenite, 7-40% by weight of cerium, and 0.01-3% by weight of at least one metal from group VIII, the cerium being deposited on the mordenite, and the percentages being with respect to the weight of catalyst.

Abstract: The invention concerns the dismutation of alkylaromatic hydrocarbons, preferably the dismutation of toluene to produce benzene and xylenes, and/or the transalkylation of alkylaromatic hydrocarbons, preferably the transalkylation of toluene and trimethylbenzenes to produce xylenes, in a reaction zone comprising at least two catalytic beds each comprising a different catalyst, one of the catalysts containing at least one zeolite with mordenite type structure, at least partially in its acid form, and the other catalyst containing at least one zeolite with mazzite type structure, at least partially in its acid form, each catalyst containing at least one matrix and, optionally, at least one element selected from the group formed by groups IB and VIII of the periodic classification of the elements.

Abstract: The invention concerns the use of a catalyst comprising at least one zeolite having a mazzite type structure in its acid form, the catalytic properties of the catalyst having been modified by depositing, on the external surface of the crystals, at least one metal selected from metals from group IIa of the periodic classification of the elements, such as Be, Mg, Ca, Sr or Ba, group IVb, such as Ti, Zr or Hf, group IIb such as Zn, Cd or Hg and group IVa such as Ge, Sn or Pb, said catalyst also comprising at least one matrix and, optionally at least one element selected from the group formed by IB and VIII of the periodic classification of the elements, for the dismutation of alkylaromatic hydrocarbons, preferably for the dismutation of toluene to produce benzene and xylenes, and/or for the transalkylation of alkylaromatic hydrocarbons, preferably for the transalkylation of toluene and trimethylbenzenes to produce xylenes.

Abstract: Disclosed are reactions for the aromatization of hydrocarbons containing 2 to 9 carbon atoms per molecule, with a composite catalyst containing:an MFI zeolite in hydrogen form, the framework containing at least one of the elements silicon, aluminum and/or gallium; a matrix; gallium; at least one noble metal of the platinum family, at least one additional metal selected from the group made up of tin, germanium, indium, copper, iron, molybdenum, gallium, thallium, gold, silver, ruthenium, chromium, tungsten and lead, and possibly a compound selected from the group made up of alkali and alkaline earth metals.

Abstract: The invention concerns a method of producing liquid hydrocarbons from natural gas, characterized in that:a) the natural gas is separated in (2) into at least two fractions, a first fraction of gas enriched with methane and a second fraction enriched with C2+ alkanesb) the methane is selectively oxidised in (7a) by molecular oxygen in the presence of a catalyst for oxidizing linkage of methanec) the fraction enriched with C2+ alkanes is at least partly mixed with the effluent from selective oxidation, when at least 80% of the molecular oxygen introduced at stage (b) has already been consumed at stage (b)d) the mixture resulting from stage (c) is pyrolysed in (7b)e) when the temperature of the mixture from stage (d) has been brought to a temperature from 300.degree. to 750.degree. C. and more particularly from 420.degree. to 550.degree. C.

Abstract: A composite catalyst containing:an MFI zeolite in hydrogen form, the framework containing at least one of the elements silicon, aluminium and/or gallium; a matrix; gallium; at least one noble metal of the platinum family, at least one additional metal selected from the group made up to tin, germanium, indium, copper, iron, molybdenum, gallium, thallium, gold, silver, ruthenium, chromium, tungsten and lead, and possibly a compound selected from the group made up of alkali and alkaline earth metals.Its preparation and its use in reactions for aromatising hydrocarbons containing 2 to 9 carbon atoms per molecule.