The present invention provides a preparation method of a photocatalytic composite material, and relates to the field of catalyst technologies. The preparation method provided in the present invention includes the following steps: (1) subjecting plant leaves to soaking pretreatment to obtain template biomass; (2) mixing a molybdenum source-sulfur source aqueous solution with the template biomass obtained in step (1) and conducting impregnation to obtain a composite material precursor; and (3) calcining the composite material precursor obtained in step (2) to obtain the photocatalytic composite material. The photocatalytic composite material in the present invention includes acicular molybdenum sulfide and biomass carbon, the acicular molybdenum sulfide is loaded to a surface of the flake carbon, the mass content of the biomass carbon is 70% to 90%, and the mass content of the molybdenum sulfide is 10% to 30%. Performance of photocatalytic hydrogen production of the photocatalytic composite material in the present invention is better than that of a pure molybdenum sulfide material and has excellent photocorrosion resistance, and hydrogen production efficiency is reduced by only approximately 10% after three cycles.

The invention has as its object a catalyst that comprises a substrate based on alumina or silica or silica-alumina, at least one element from group VIII, at least one element from group VIB, and an organic compound of formula (I) ##STR00001##
in which R1, R2, R3, R4 and R5 are selected from among a hydrogen atom, or a hydroxyl radical, or a hydrocarbon radical that comprises from 1 to 12 carbon atoms that can also comprise at least one oxygen atom, and R6 is selected from a hydrogen atom, a hydrocarbon radical that comprises from 1 to 12 carbon atoms that can also comprise at least one oxygen atom, a methacryloyl radical, an acryloyl radical or an acetyl radical. The invention also relates to the method for preparation of said catalyst and its use in a method for hydrotreatment and/or hydrocracking.

Provided is a catalyst which does not corrode at high potentials or in acidic electrolytes of fuel cells, is stable, effectively participates in electrode reactions not only in a three-phase interface of a gas phase (humidified reaction gas) and a liquid phase formed in catalyst particles present on the surface in contact with an electrolyte membrane but also in a three-phase interface in catalyst particles in a catalyst layer present at positions away from the electrolyte membrane, has a high utilization efficiency of catalyst particles, has a high oxygen reduction ability, provides high characteristics, and is inexpensive compared to platinum. A fuel cell thus obtained has high characteristics and a long life, and is relatively inexpensive and excellent in economic efficiency. There is provided a porous catalyst comprising a sulfur-containing oxycarbonitride containing molybdenum, boron, and the following metal K (at least one metal selected from the group consisting of tantalum, zirconium, copper, iron, tungsten, titanium, vanadium, cobalt, manganese, aluminum, and nickel).

A visible light catalyst, its preparation method, a visible light catalyst activated persulfate system and its use. The visible light catalyst includes a carbon material, a transition metal compound and a coating material. The carbon material is conductive carbon material, and the transition metal compound is selected from one or more of transition metal oxides, transition metal sulfides, and acid or salt compounds containing a transition metal. The visible light catalyst has high visible light photocatalytic activity and performance of degrading organic pollutants and activating persulfate which can result in synergistically degrading degradation-resistant organic pollutants.

A hydroprocessing catalyst or catalyst precursor has been developed. The catalyst is a transition metal molybdotungstate material or metal sulfides derived therefrom. The hydroprocessing using the transition metal molybdotungstate material may include hydrodenitrification, hydrodesulfurization, hydrodemetallation, hydrodesilication, hydrodearomatization, hydroisomerization, hydrotreating, hydrofining, and hydrocracking.

A hydroprocessing catalyst or catalyst precursor has been developed. The catalyst is a transition metal molybdotungstate material or metal sulfides derived therefrom. The hydroprocessing using the transition metal molybdotungstate material may include hydrodenitrification, hydrodesulfurization, hydrodemetallation, hydrodesilication, hydrodearomatization, hydroisomerization, hydrotreating, hydrofining, and hydrocracking.

An electrocatalyst comprising molybdenum disulfide nanosheets with dispersed iron phosphide nanoparticles is described. The molybdenum disulfide nanosheets may have an average length in a range of 300 nm-1 μm and the iron phosphide nanoparticles may have an average diameter in a range of 5-20 nm. The electrocatalyst may have an electroactive surface area in a range of 10-50 mF.Math.cm.sup.−2 when deposited on a working electrode for use in a hydrogen evolution reaction.

An electrocatalyst comprising molybdenum disulfide nanosheets with dispersed iron phosphide nanoparticles is described. The molybdenum disulfide nanosheets may have an average length in a range of 300 nm-1 μm and the iron phosphide nanoparticles may have an average diameter in a range of 5-20 nm. The electrocatalyst may have an electroactive surface area in a range of 10-50 mF.Math.cm.sup.−2 when deposited on a working electrode for use in a hydrogen evolution reaction.

A composition and method of making such a composition that has application in the hydroprocessing of hydrocarbon feedstocks. The method comprises selecting an organic additive by the use of a correlation model for predicting catalytic activity as a function of a physical property that is associated with the organic additive and incorporating the organic additive into a support material to provide the additive impregnated composition.

The current invention relates a process for making and using a bulk catalyst precursor (i.e. no support material is added as such) comprising Ni and Mo and/or W and an organic component, wherein the molar ratio of C:(Mo+W) ranges from 1.5 to 10. The bulk catalyst precursor is prepared from a mixture of metal-precursors with an organic agent. The organic agent is partly decomposed to form a mixed metal-oxide/C phase which is in effect the bulk catalyst precursor. This bulk catalyst precursor (i) is effectively insoluble in water (ii) does not have any appreciable pore volume or surface area and (iii) does not contain a (nano)crystalline metal-oxide phase as characterized by XRD.