Abstract: The present invention relates to a catalytic system comprising:—a support comprising cerium and/or zirconium,—nickel, and—a promoter chosen from lanthanides, yttrium, strontium, copper, manganese, cobalt and mixtures thereof, wherein it is not possible for the lanthanide to be cerium. It also relates to a process for preparing such a catalytic system, and also to a process for converting a gas comprising CO2 and/or CO in the presence of such a catalytic system and of a cold plasma, preferentially generated by dielectric barrier discharge (DBD).

Abstract: The present invention concerns a reactor for the conversion of carbon dioxide or carbon monoxide into hydrocarbon and/or alcohol comprising a support made from an electrically and thermally conductive material, forming the wall or walls of at least one longitudinal channel that passes through the support and also acting as the cathode of the reactor, at least one wire electrode forming an anode of the reactor, and extending within each longitudinal channel, and being arranged at a distance from the wall or walls of the longitudinal channel, each wire electrode optionally being covered with an electrically insulating layer along the part of the wire electrode extending within the longitudinal channel, a catalyst capable of catalysing a conversion reaction for the conversion of carbon dioxide or carbon monoxide into hydrocarbon and/or alcohol, the catalyst being situated between the wire electrode and the wall or walls of each longitudinal channel.

Abstract: The invention relates to a catalytic composition for treating coal combustion gases, to a method for preparing said composition, to a catalytic system having such a composition, and to the use of the catalytic composition for treating coal combustion gases. The catalytic composition is made of particles of a solid composition cCeO2zZrO2 containing rhodium in the form of Rh2O3 and rhodium in the form of Rh4+.

Abstract: A method of treating a methane residue in a gas mixture at a temperature lying in the range 200° C. to 500° C. and including at least methane at a concentration lying in the range 50 ppm to 2500 ppm and oxygen at a concentration lying in the range 0.5% to 12% by volume. According to the invention, the methane residue is treated by a plasma having energy density lying in the range 15 J/L to 100 J/L generated in a plasma reactor by applying a high voltage electrical signal between an internal electrode and an external electrode of the plasma reactor, the external electrode being cylindrical in shape and surrounding the internal electrode, and at least one of the electrodes being covered in a dielectric material to create a dielectric barrier discharge in the gas mixture and convert part of the methane residue into carbon monoxide.

Abstract: The invention concerns a catalyst containing at least one amorphous oxide matrix, at least one carbide and phosphorous deposited on said catalyst or contained in the matrix, in which the carbide contain at least one group VIB element and, optionally, at least one element from group VIII of the periodic table. The invention also concerns the use of the catalyst for hydrodesulphurisation and hydrogenation of aromatic compounds in gas oils with a low sulphur content.