Disclosed in the present invention are a preparation method for an olefin epoxidation catalyst and applications thereof. The method comprises: loading an auxiliary metal salt onto a silica gel carrier, and carrying out a drying treatment to the silica gel carrier; loading a titanium salt (preferably TiCl.sub.4) onto the silica gel carrier by a chemical vapor deposition method; calcining to obtain a silica gel on which the auxiliary metal oxide and Ti species are loaded; obtaining an catalyst precursor (Ti-MeOSiO.sub.2 composite oxide) by water vapor washing; loading alkyl silicate (preferably tetraethyl orthosilicate) onto the surface of the catalyst precursor by a chemical vapor deposition method and calcining the catalyst precursor to obtain a Ti-MeOSiO.sub.2 composite oxide with the surface coated with a SiO.sub.2 layer; and carrying out a silylanization treatment to obtain the catalyst. The catalyst can be applied to a chemical process of propylene epoxidation to prepare propylene oxide, and has an average selectivity to PO up to 96.7%, the method of the present invention and the applications thereof have industrial application prospects.

Provided are a supported metal material showing high catalytic activity, a supported metal catalyst, a method of producing ammonia and a method of producing hydrogen using the supported metal catalyst, and a method of producing a cyanamide compound. The supported metal material of the present invention is a supported metal material in which a transition metal is supported on a support, and the support is a cyanamide compound represented by the following general formula (1); MCN.sub.2 (1), wherein M represents a group II element of the periodic table, and the specific surface area of the cyanamide compound is 1 m.sup.2g.sup.1 or more.

The invention relates to a process for adding an organic compound to a porous solid wherein the porous solid and the organic compound in the liquid state are brought together simultaneously, without physical contact between the solid and the organic compound in the liquid state, at a temperature below the boiling point of the organic compound and under pressure and time conditions such that a fraction of said organic compound is transferred gaseously to the porous solid.

A high-efficiency visible-light catalytic material, a preparation method and an application thereof are provided by the present application, relating to the technical field of photocatalytic materials. The present application prepares photocatalytic material Ag@AgCl/CA by compounding Ag@AgCl and calcium alginate gel, and the prepared photocatalytic material is shaped as small particles. The photocatalytic material Ag@AgCl/CA is used to degrade tetracycline antibiotics.

The present disclosure disclosures a graphene modified iron-based catalyst and preparation and application thereof for use in Fischer-Tropsch reaction, belonging to the technical field of catalytic conversion of synthesis gas. The catalyst consists of, by mass percent, 0.01-30% of graphene, 0-20% of promoter and 60-99.99% of iron oxide powder. The preparation process of the catalyst is as follows: the graphene, the iron oxide powder and the promoter are sequentially placed in an aqueous solution for ultrasonic treatment and stirring, and then rotary evaporation, drying and calcining are conducted. The preparation method is simple. The catalyst shows excellent activity in the Fischer-Tropsch reaction, and maintains a high CO conversion rate of 90% or above for a long time at a very high reaction space velocity; meanwhile, the alkane content in a product is low, and an olefin-alkane ratio can reach 14, thus having an extremely high industrial application value.

Provided is a method forming a catalytic nanocoating on a surface of a metal plate, wherein the method comprises pretreating the surface of the metal plate by means of heat treatment at 500-800 C., forming a metaloxide support by washcoating on the surface of the metal plate, and coating the surface of the metal plate by depositing catalytically active metals and/or metaloxides on the metaloxide support by means of an atomic layer deposition (ALD) method in order to form a thin and conformal catalyst layer on the metal plate. Further, the invention relates to a catalyst and a use.

A boron filled hybrid nanotube and a method for producing and rendering boron filled hybrid nanotubes suitable for applications are provided. A mixture of a boron containing nanowire producing compound and catalysts is prepared and ground for a predetermined time period. The ground mixture is subjected to a vapor deposition process including passing an inert gas over the ground mixture after adding a nanotube producing compound to the ground mixture or after passing a reactant gas on the ground mixture in a reactor at a configurable reaction temperature and a configurable reaction pressure for a configurable reaction time to produce the boron filled hybrid nanotubes with enhanced mechanical, thermal and electrical properties. Each boron filled hybrid nanotube includes one or more boron based nanowires embedded within one or more single walled or multi-walled nanotubes. The boron filled hybrid nanotubes are further purified and functionalized using acids, and/or bases, and/or surfactants.

The present invention discloses a preparation method of an alumina supported cerium oxide powder material. A cerium organometallic precursor is effectively decomposed into CeO.sub.2 nanoparticles at 500-700 C. in an oxygen atmosphere condition by using a chemical vapor deposition method, and the CeO.sub.2 nanoparticles are evenly dispersed on an Al.sub.2O.sub.3 support. The decomposition of the CeO.sub.2 precursor is accelerated by changing experimental parameters of reaction between organic materials and oxygen, so as to control the size and microstructure of powder, thereby achieving the preparation and even dispersion of cerium oxide nanoparticles, and avoiding the problem of generation of toxic waste liquor during reaction. The method of the present invention is simple, has a short preparation period, and the cerium oxide nanoparticles prepared are evenly dispersed, can be used as catalytic materials and functional materials, and have a broad application prospect in multiple fields.

The method for producing chlorine by oxidation of hydrogen chloride with oxygen in the presence of a catalyst in a fixed-bed reactor, wherein [I] a material containing hydrogen chloride and oxygen is allowed to contact a catalyst in a temperature range of 280 to 370 C., and [II] the material containing hydrogen chloride and oxygen has an oxygen concentration of 45 to 75 vol %.

A device for catalytic conversion of NOx to 8 and/or of CO to CO2, including: a ceramic support including at least a plurality of channels; a thermal barrier made of thermal insulating material covering at least one part of the internal surface of the channels; porous SiC at least partially covering the thermal barrier such that the SiC is separated from the support by the thermal barrier; one or more conversion catalysts at least on the SiC.