There is provided a method for producing high-purity bromine pentafluoride while leaving a less amount of an unreacted fluorine gas. The method for producing bromine pentafluoride includes a reaction step of feeding a bromine-containing compound, which is at least one of a bromine gas and bromine trifluoride, and a fluorine gas to a reactor to give a (fluorine atom):(bromine atom) molar ratio, that is, F/Br of 3.0 or more and 4.7 or less and reacting the bromine-containing compound and the fluorine gas to each other to obtain a reaction mixture containing bromine pentafluoride and bromine trifluoride; and a separation step of separating bromine pentafluoride and bromine trifluoride in the reaction mixture from each other.

There is provided a method for producing high-purity bromine pentafluoride while leaving a less amount of an unreacted fluorine gas. The method for producing bromine pentafluoride includes a reaction step of feeding a bromine-containing compound, which is at least one of a bromine gas and bromine trifluoride, and a fluorine gas to a reactor to give a (fluorine atom):(bromine atom) molar ratio, that is, F/Br of 3.0 or more and 4.7 or less and reacting the bromine-containing compound and the fluorine gas to each other to obtain a reaction mixture containing bromine pentafluoride and bromine trifluoride; and a separation step of separating bromine pentafluoride and bromine trifluoride in the reaction mixture from each other.

The present invention provides a cerium dioxide-supported low-dose PtCu ultrafine alloy catalyst, a preparation method and an application thereof, which belongs to the fields of environmental catalysis and preparation of catalyst materials. Metal-state PtCu ultrafine alloy particles are prepared by an oleylamine method, and then a cerium dioxide support is immersed into an n-butylamine solution of PtCu ultrafine alloy, centrifuged, washed with alcohol, and dried to obtain the cerium dioxide-supported low-dose PtCu ultrafine alloy catalyst. The catalyst obtained has excellent activity and stability in simultaneously degrading atmospheric VOCs and soot under a photothermocatalytic condition. There are the characteristics of simple preparation process method, very low Pt dosage, high utilization rate, and excellent photothermocatalytic performance.

The present invention provides a cerium dioxide-supported low-dose PtCu ultrafine alloy catalyst, a preparation method and an application thereof, which belongs to the fields of environmental catalysis and preparation of catalyst materials. Metal-state PtCu ultrafine alloy particles are prepared by an oleylamine method, and then a cerium dioxide support is immersed into an n-butylamine solution of PtCu ultrafine alloy, centrifuged, washed with alcohol, and dried to obtain the cerium dioxide-supported low-dose PtCu ultrafine alloy catalyst. The catalyst obtained has excellent activity and stability in simultaneously degrading atmospheric VOCs and soot under a photothermocatalytic condition. There are the characteristics of simple preparation process method, very low Pt dosage, high utilization rate, and excellent photothermocatalytic performance.

The invention provides a system for manufacturing graphene wool which includes a receptacle, a graphene growth substrate locatable inside the receptacle, a heating device for increasing the temperature inside the receptacle, an inlet gas flow communication with the receptacle for controlling the introduction of gaseous substances into the receptacle, and a cooling device for rapidly decreasing the temperature inside the receptacle. The invention extends to a method for manufacturing graphene wool and to an air pollutant trap which includes: a sorbent, and a housing for housing the sorbent, wherein the sorbent includes graphene.

The invention provides a system for manufacturing graphene wool which includes a receptacle, a graphene growth substrate locatable inside the receptacle, a heating device for increasing the temperature inside the receptacle, an inlet gas flow communication with the receptacle for controlling the introduction of gaseous substances into the receptacle, and a cooling device for rapidly decreasing the temperature inside the receptacle. The invention extends to a method for manufacturing graphene wool and to an air pollutant trap which includes: a sorbent, and a housing for housing the sorbent, wherein the sorbent includes graphene.

Methods for synthesizing a mercaptan compound include the steps of contacting a nickel-molybdenum catalyst with H.sub.2S at a sulfiding temperature of less than or equal to 235° C. to form a supported sulfur-containing catalyst, and then contacting an alcohol compound or an olefin compound, H.sub.2S, and the supported sulfur-containing catalyst to form a reaction mixture containing the mercaptan compound.

A method of making N-(2,4-dinitrophenyl)-4-nitrobenzamide from a mixture of 2,4-dinitroaniline, 4-nitrobenzoyl chloride, and solid acid catalyst in an organic solvent, wherein the solid acid catalyst is not soluble in the organic solvent, the solid acid catalyst being an acidic clay, an ion exchange resin, a beta zeolite, a sulfonated tetrafluoroethylene-based fluoropolymer-copolymer, or some mixture of these.

A method of making N-(2,4-dinitrophenyl)-4-nitrobenzamide from a mixture of 2,4-dinitroaniline, 4-nitrobenzoyl chloride, and solid acid catalyst in an organic solvent, wherein the solid acid catalyst is not soluble in the organic solvent, the solid acid catalyst being an acidic clay, an ion exchange resin, a beta zeolite, a sulfonated tetrafluoroethylene-based fluoropolymer-copolymer, or some mixture of these.

The present disclosure discloses a catalyst and a method for preparing 2-ethoxyphenol by catalytic depolymerization of lignin. The catalyst comprises sepiolite as a carrier and tungsten, nickel and molybdenum as active components supported on sepiolite. The catalyst for preparing 2-ethoxyphenol by catalytic depolymerization of lignin in the present disclosure can catalytically depolymerize lignin, realize the directional preparation of 2-ethoxyphenol from lignin, and co-produce lignin oil. It has a comparatively high selectivity for 2-ethoxyphenol and can achieve a lignin conversion rate of more than 95%, a 2-ethoxyphenol selectivity of more than 20% in a liquid product, and a yield of more than 100 mg/g of lignin.