Abstract: The invention concerns a process for the preparation of a catalyst for carrying out hydrogenation reactions in hydrotreatment and hydrocracking processes. Said catalyst is prepared from at least one mononuclear precursor based on molybdenum (Mo), in its monomeric or dimeric form, having at least one Mo?O or Mo—OR bond or at least one Mo?S or Mo—SR bond where [R=CxHy where x?1 and (x?1)?y?(2x+1) or R=Si(OR?)3 or R=Si(R?)3 where R?=Cx?Hy? where x??1 and (x??1)?y??(2x?+1)], and optionally from at least one promoter element from group VIII. Said precursors are deposited onto an oxide support which is suitable for the process in which it is used, said catalyst being dried at a temperature of less than 200° C. then advantageously being sulphurized before being deployed in said process.

Abstract: The invention concerns a method for selectively hydrogenating a hydrocarbon charge containing at least two carbon atoms per molecule, having a final boiling point which is less than or equal to 250° C., and comprising at least one polyunsaturated compound, wherein the charge, in the presence of hydrogen, is brought into contact with at least one catalyst comprising a carrier and an active metal phase deposited on the carrier, the active metal phase comprising iron and at least one metal selected from zinc and copper in a molar ratio of Fe:(Zn and/or Cu) of between 0.35 and 0.99.

Abstract: The invention relates to a method for selective hydrogenation of a hydrocarbon feedstock that contains at least 2 carbon atoms per molecule and that has a final boiling point that is less than or equal to 250° C. and that comprises at least one polyunsaturated compound, in which in the presence of hydrogen, said feedstock is brought into contact with at least one catalyst that comprises a substrate and an active metal phase deposited on said substrate; said active metal phase comprises copper and at least one metal that is selected from between nickel and cobalt in a molar ratio of Cu:(Ni and/or Co) of greater than 1.

Abstract: The invention concerns a process for the preparation of a catalyst based on tungsten intended for hydrotreatment or hydrocracking processes. The invention concerns a process for the preparation of a catalyst for carrying out hydrogenation reactions in hydrotreatment and hydrocracking processes. Said catalyst is prepared from at least one mononuclear precursor compound based on tungsten (W), in its monomeric or dimeric form, having at least one W?O or W—OR bond or at least one W?S or W—SR bond where [R?CxHy where x?1 and (x?1)?y?(2x+1) or R?Si(OR?)3 or R?Si(R?)3 where R??Cx?Hy? where x??1 and (x??1)?y??(2x?+1)], optionally at least one Mo precursor and optionally at least one promoter element from group VIII. Said precursors are deposited onto an oxide support which is suitable for the process in which it is used, said catalyst advantageously being sulphurized before being deployed in said process.

Abstract: The invention relates to a method for selective hydrogenation of a hydrocarbon feedstock that contains at least 2 carbon atoms per molecule and that has a final boiling point that is less than or equal to 250° C. and that comprises at least one polyunsaturated compound, in which in the presence of hydrogen, said feedstock is brought into contact with at least one catalyst that comprises a substrate and an active metal phase deposited on said substrate; said active metal phase comprises copper and at least one metal that is selected from between nickel and cobalt in a molar ratio of Cu:(Ni and/or Co) of greater than 1.

Abstract: The invention concerns a method for selectively hydrogenating a hydrocarbon charge containing at least two carbon atoms per molecule, having a final boiling point which is less than or equal to 250° C., and comprising at least one polyunsaturated compound, wherein the charge, in the presence of hydrogen, is brought into contact with at least one catalyst comprising a carrier and an active metal phase deposited on the carrier, the active metal phase comprising iron and at least one metal selected from zinc and copper in a molar ratio of Fe:(Zn and/or Cu) of between 0.35 and 0.99.

Abstract: The present invention relates to a method of oligomerizing olefins M selectively to oligomers Mn, involving a catalytic system comprising at least one organometallic complex with a metal of groups 4 to 10 of the periodic table of molecular volume Vmo, and a micro- or mesoporous solid whose average micropore diameter ? is greater than or equal to ?min defined as a function of the molecular volume (Vmo+nVmM), where n is the number of monomeric olefins strung together upon obtaining the metallacycle intermediate and VmM the molecular volume of the monomeric olefin.

Abstract: The invention concerns a process for the preparation of a catalyst based on tungsten intended for hydrotreatment or hydrocracking processes. The invention concerns a process for the preparation of a catalyst for carrying out hydrogenation reactions in hydrotreatment and hydrocracking processes. Said catalyst is prepared from at least one mononuclear precursor compound based on tungsten (W), in its monomeric or dimeric form, having at least one W?O or W—OR bond or at least one W?S or W—SR bond where [R?CxHy where x?1 and (x?1)?y?(2x+1) or R?Si(OR?)3 or R?Si(R?)3 where R??Cx?Hy? where x??1 and (x??1)?y??(2×t+1)], optionally at least one Mo precursor and optionally at least one promoter element from group VIII. Said precursors are deposited onto an oxide support which is suitable for the process in which it is used, said catalyst advantageously being sulphurized before being deployed in said process.

Abstract: The invention concerns a process for the preparation of a catalyst for carrying out hydrogenation reactions in hydrotreatment and hydrocracking processes. Said catalyst is prepared from at least one mononuclear precursor based on molybdenum (Mo), in its monomeric or dimeric form, having at least one Mo?O or Mo—OR bond or at least one Mo?S or Mo—SR bond where [R?CxHy where x?1 and (x?1)?y?(2x+1) or R?Si(OR?)3 or R?Si(R?)3 where R??Cx?Hy? where x??1 and (x??1)?y??(2x?+1)], and optionally from at least one promoter element from group VIII. Said precursors are deposited onto an oxide support which is suitable for the process in which it is used, said catalyst being dried at a temperature of less than 200° C. then advantageously being sulphurized before being deployed in said process.

Abstract: A method of preparing a composition of alcohol esters of linear monocarboxylic acids with 6 to 26 carbon atoms from a vegetable or animal oil, neutral or acid, virgin or recycled, with monoalcohols having 1 to 18 carbon atoms, in the presence of a catalyst of nitrogen-containing metallophosphate type.

Abstract: A method of preparing a composition of alcohol esters of linear monocarboxylic acids with 6 to 26 carbon atoms from a vegetable or animal oil, neutral or acid, virgin or recycled, with monoalcohols having 1 to 18 carbon atoms, in the presence of a catalyst of nitrogen-containing metallophosphate type.

Abstract: The present invention relates to a method of oligomerizing olefins M selectively to oligomers Mn, involving a catalytic system comprising at least one organometallic complex with a metal of groups 4 to 10 of the periodic table of molecular volume Vmo, and a micro- or mesoporous solid whose average micropore diameter ? is greater than or equal to ?min defined as a function of the molecular volume (Vmo+nVmM), where n is the number of monomeric olefins strung together upon obtaining the metallacycle intermediate and VmM the molecular volume of the monomeric olefin.

Abstract: A process for the reversible storage of hydrogen, comprising bringing an alloy of alkaline metal and silicon into contact with gaseous hydrogen leading to the formation of the hydride or corresponding hydrides, comprises the use of at least one balanced system that corresponds to the formula: MXMSi?MXMSiHn ?where M is selected from among Li, Na, or K and in which atomic ratios XM take on the following values: XLi=1 1?XNa?3 1?XK?2 ?n is the number of hydrogen atoms corresponding to the stoichiometry of the hydride or formed hydrides. or to the formula MSiXSi?MSiXSiH2XSi+1 ?where M is selected from among Li, Na, or K and in which the atomic ratio XSi=Si/M takes on a value of 1 to 4.

Abstract: A process for the reversible storage of hydrogen, comprising bringing an alloy of alkaline metal and silicon into contact with gaseous hydrogen leading to the formation of the hydride or corresponding hydrides, comprises the use of at least one balanced system that corresponds to the formula: MXMSiMXMSiHn where M is selected from among Li, Na, or K and in which atomic ratios XM take on the following values: XLi=1 1?XNa?3 1?XK?2 n is the number of hydrogen atoms corresponding to the stoichiometry of the hydride or formed hydrides. or to the formula MSiXSiMSiXSiH2XSi+1 where M is selected from among Li, Na, or K and in which the atomic ratio XSi=Si/M takes on a value of 1 to 4.

Abstract: A process for the reversible storage of hydrogen, comprising bringing into contact a material that consists of magnesium elements and nitrogen elements with gaseous hydrogen leading to the formation of an amide or corresponding hydrides, comprises the use of a balanced system corresponding to the formula: Mg3N2Mg(NH2)2+2MgHn where n is the number of hydrogen atoms corresponding to the stoichiometry of the hydride or hydrides formed. The material can also comprise, in a minor proportion, at least one transition metal of groups 3 to 12 of the periodic table that is selected from among Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn and Pd.

Abstract: A process for the reversible storage of hydrogen, comprising bringing into contact an alloy of magnesium and palladium with the gaseous hydrogen leading to the formation of hydride or corresponding hydrides, comprises the use of a balanced system corresponding to the formula: MgxPdMgxPdHn in which atomic ratio x takes on a value of 3 to 6, and n is the number of hydrogen atoms corresponding to the stoichiometry of the hydride or hydrides formed or to the formula: MgxPdMg2PdH4+Mgx-2Hn in which the atomic ratio x takes on a value of 7 to 9, and n is the number of hydrogen atoms corresponding to the stoichiometry of the hydride or hydrides formed.

Abstract: A process for the reversible storage of hydrogen, comprising bringing into contact an alloy of magnesium and palladium with the gaseous hydrogen leading to the formation of hydride or corresponding hydrides, comprises the use of a balanced system corresponding to the formula: MgxPdMgxPdHn in which atomic ratio x takes on a value of 3 to 6, and n is the number of hydrogen atoms corresponding to the stoichiometry of the hydride or hydrides formed or to the formula: MgxPdMg2PdH4+Mgx-2Hn in which the atomic ratio x takes on a value of 7 to 9, and n is the number of hydrogen atoms corresponding to the stoichiometry of the hydride or hydrides formed.

Abstract: A process for the reversible storage of hydrogen, comprising bringing into contact a material that consists of magnesium elements and nitrogen elements with gaseous hydrogen leading to the formation of an amide or corresponding hydrides, comprises the use of a balanced system corresponding to the formula: Mg3N2 <Mg(NH2)2 +2MgHn where n is the number of hydrogen atoms corresponding to the stoichiometry of the hydride or hydrides formed. The material can also comprise, in a minor proportion, at least one transition metal of groups 3 to 12 of the periodic table that is selected from among Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn and Pd.

Abstract: A process for the reversible storage of hydrogen, comprising bringing an alloy of alkaline metal and silicon into contact with gaseous hydrogen leading to the formation of the hydride or corresponding hydrides, comprises the use of at least one balanced system that corresponds to the formula: MXMSiMXMSiHn where M is selected from among Li, Na, or K and in which atomic ratios XM take on the following values: XLi=1

Abstract: The invention concerns a catalyst for hydrorefining and hydroconverting hydrocarbon feeds, comprising a mixed sulphide comprising at least two elements selected from elements with an atomic number selected from the group formed by the following numbers: 3, 11, 12, 19 to 33, 37, to 51, 55 to 83, 87 to 103, characterized in that the mixed sulphide results from a combination of at least one element the sulphide of which has a bond energy between the metal and sulphur of less than 50.+-.3 kcal/mol (209.+-.12 kJ/mol) and at least one element the sulphide of which has a bond energy between the metal and sulphur of more than 50.+-.3 kcal/mol (209.+-.12 kJ/mol), the mixed sulphide thus having a mean bond energy between the metal and sulphur which is in the range 30 to 70 kcal/mol (125 to 293 kJ/mol).