摘要:
The invention relates to a catalyst including at least the element tantalum, at least one aldol-reaction element and at least one mesoporous oxide matrix, the mass of tantalum making up from 0.1 to 30% of the mass of the mesoporous oxide matrix, the mass of the at least one aldol-reaction element making up from 0.02 to 4% of the mass of the mesoporous oxide matrix, and to the use thereof to convert ethanol into butadiene.
摘要:
The invention relates to a catalyst including a mesoporous oxide matrix, said matrix including at least one oxide of an element X selected from among silicon and titanium, taken alone or in a mixture, said catalyst including at least the element tantalum and the element niobium, the mass of tantalum making up from 0.1 to 30% of the mass of the mesoporous oxide matrix, the mass of niobium making up from 0.02 to 6% of the mass of the mesoporous oxide matrix, the mass content of the element tantalum being no lower than the mass content of the element niobium. The invention also relates to the use of said catalyst in a method for producing 1,3-butadiene from a feedstock including at least ethanol.
摘要:
The invention relates to a mesoporous mixed-oxide catalyst including silicon and at least one metal M chosen from the group made up of the elements of groups 4 and 5 of the periodic table and the mixtures thereof, the mass of metal M making up from 0.1 to 20% of the mass of the mixed oxide. The catalyst is preferably prepared by the modern metal-organic sol-gel process. The invention also relates to the use of the catalyst to convert ethanol into butadiene.
摘要:
The invention relates to a catalyst including at least the element tantalum, and at least one mesoporous oxide matrix having undergone acid leaching, including at least, before leaching, 90 wt % of silica, the mass of the element tantalum making up from 0.1 to 30% of the mass of said mesoporous oxide matrix.
摘要:
The invention relates to a method for synthesizing linear paraffinic hydrocarbons from a feed including carbon monoxide and dihydrogen in the presence of a catalyst including a mesoporous oxide matrix and a mass percentage of cobalt of between 0.5 and 60%, expressed in wt.% of metal relative to the total weight of said catalyst, said catalyst being prepared according to a preparation method including at least the steps of: a) mixing in an aqueous or hydro-organic solvent at least one molecular precursor including cobalt and at least one colloidal precursor of said mesoporous oxide matrix including at least one element X selected from the group consisting of silicon, aluminum, titanium, zirconium, cerium and mixtures thereof, said molecular precursor including cobalt being made soluble in said aqueous or hydro-organic solvent; b) atomizing the mixture obtained in step a) to result in the formation of spherical droplets; c) drying said spherical droplets to obtain solid particles at a temperature of between 10 and 300°C; d) activating said solid particles via reductive treatment so as to form cobalt nanoparticles having a valence state of 0.
摘要:
A process is described for the preparation of an inorganic material with a hierarchical porosity in the micropore and mesopore domains. The material has at least two elementary spherical particles having a maximum diameter of 200 microns. The process comprises: a) preparing a solution containing zeolitic nanocrystals with a maximum nanometric dimension equal to 60 nm based on silicon and/or precursor elements of proto-zeolitic entities based on silicon; b) mixing, in solution, metallic particles or at least one metallic precursor of metallic particles, a surfactant and the solution obtained in accordance with a) such that the ratio of the volumes of inorganic and organic materials, Vinorganic/Vorganic, is 0.29 to 0.50; c) aerosol atomization of the solution obtained in b) resulting in formation of spherical droplets; d) drying the droplets; g) eliminating the template and surfactant.
摘要:
The invention relates to a material having a hierarchised porosity and consisting of at least two elementary spherical particles having a maximum diameter of 200 microns, at least one of said spherical particles comprising at least one matrix based on silicon oxide. Said material has a macroporous volume measured by mercury porosimetry of between 0.05 and 1 ml/g, a mesoporous volume measured by nitrogen volumetry of between 0.03 and 0.4 ml/g, and the matrix comprises amorphous walls. The invention also relates to the preparation of the material.