Abstract: The present invention relates to a dinuclear molybdenum complex with ligands selected from fatty tertiary amines of formula (I): R—N[(CH2)nR2][(CH2)nR3]??(I) wherein R represents a linear or branched alkyl comprising 3 to 30 carbon atoms, preferably 3 to 20, advantageously 7 to 17 carbon atoms; n, identical or different, represents 2 or 3; R2 and R3, identical or different, represent an O, OR, NR?2, COOR?, or COO group, where R?, identical or different, represents a hydrogen atom or an alkaline or alkaline earth metal, preferably R? is H, preferably R2 and R3, identical or different, represent an OH or NH2 group.

Abstract: The present invention relates to a dinuclear molybdenum complex with ligands selected from fatty tertiary amines of formula (I): R—N[(CH2)nR2][(CH2)nR3]??(I) wherein R represents a linear or branched alkyl comprising 3 to 30 carbon atoms, preferably 3 to 20, advantageously 7 to 17 carbon atoms; n, identical or different, represents 2 or 3; R2 and R3, identical or different, represent an O, OR, NR?2, COOR?, or COO group, where R?, identical or different, represents a hydrogen atom or an alkaline or alkaline earth metal, preferably R? is H, preferably R2 and R3, identical or different, represent an OH or NH2 group.

Abstract: The invention relates to a method for preparing an olefine, a diene or a polyene, by catalytic conversion of at least one alcohol having a carbon chain of at least three carbon atoms and different from propan-2-ol, in the presence of at least one catalyst based of at least one phosphate of a metal or several metals M, M being chosen from among the 15 lanthanides (Lanthanum, Cerium, Praseodymium, Neodymium, Promethium, Samarium, Europium, Gadolinium, Terbium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium, Lutetium), Yttrium, Scandium and Boron, and the applications of this method.

Abstract: The invention concerns a composition comprising a mixture of zinc sulphide (ZnS) and molybdenum sulphide (MoSx), in which the Mo/Zn molar ratio is in the range 0.01 to 1.9. The invention also pertains to a process for its preparation as well as to its application in photocatalysis and more particularly to its application in photocatalysis for the production of dihydrogen from water (H2O) and/or hydrogen sulphide (H2S) and/or any other source of protons in the presence of a source emitting in the ultraviolet and/or visible spectrum.

Abstract: The invention relates to a method for preparing an olefine, a diene or a polyene, by catalytic conversion of at least one alcohol having a carbon chain of at least three carbon atoms and different from propan-2-ol, in the presence of at least one catalyst based of at least one phosphate of a metal or several metals M, M being chosen from among the 15 lanthanides (Lanthanum, Cerium, Praseodymium, Neodymium, Promethium, Samarium, Europium, Gadolinium, Terbium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium, Lutetium), Yttrium, Scandium and Boron, and the applications of this method.

Abstract: The invention concerns a composition comprising a mixture of zinc sulphide (ZnS) and molybdenum sulphide (MoSx), in which the Mo/Zn molar ratio is in the range 0.01 to 1.9. The invention also pertains to a process for its preparation as well as to its application in photocatalysis and more particularly to its application in photocatalysis for the production of dihydrogen from water (H2O) and/or hydrogen sulphide (H2S) and/or any other source of protons in the presence of a source emitting in the ultraviolet and/or visible spectrum.

Abstract: Catalyst comprising at least one zirconium oxide, characterized in that it consists, for at least 85% of its weight, of a thermally stable support with a specific surface greater than or equal to 150 m.sup.2 /g containing from 60 to 99 weight % of at least one zirconium oxide and from 40 to 1 weight % of at least one metal oxide of at least one metal chosen from the group consisting of metals from Groups V, VI and VII, noble metals such as ruthenium, osmium, rhodium, iridium and uranium, and the elements phosphorus, arsenic and sulphur, the support being obtained by the molten salts technique by introduction of a mixture of salts into a eutectic mixture of alkali metal nitrates or sulphates which, after dehydration, is maintained between 250.degree. and 550.degree. C., from 30 minutes to 5 hours.