The invention provides a process for preparing a methane oxidation catalyst, a methane oxidation catalyst thus prepared and a method of oxidizing methane.

A method for manufacturing a catalysis reactant having high efficiency catalysis for thermal reaction primarily includes: preparing a three-dimensional catalysis carrier; preparing at least one aqueous-phase nanometer metallic particle solution; soaking the catalysis carrier in a methanol solution containing a silane group compound and removing and subjecting the catalysis carrier to drying and freezing for surface modification; soaking the catalysis carrier in the aqueous-phase nanometer metallic particle solution and removing and subjecting the catalysis carrier to blow-drying to have the surface of the catalysis carrier combined with a first layer of nanometer metallic particles; soaking the catalysis carrier in a methanol solution containing 1,12-diaminododecane to carry out surface modification and removing and subjecting the catalysis carrier to drying, followed by soaking in the aqueous-phase nanometer metallic particle solution and then blow-drying to have the surface of the catalysis carrier further combined with a second layer of nanometer metallic particles.

A catalyst structure is provided. The catalyst structure includes a porous carrier and a plurality of layered hydroxides. The porous carrier includes a nitrogen-doped carbon framework, a plurality of metal oxide particles and a plurality of carbon nanotubes. The nitrogen-doped carbon framework has a plurality of pores. The metal oxide particles are uniformly dispersed in the pores of the nitrogen-doped carbon framework. The carbon nanotubes are located on a surface of the nitrogen-doped carbon framework, and one end of each of the carbon nanotubes is connected to the surface of the nitrogen-doped carbon framework. The layered hydroxides are coated on the surface of the nitrogen-doped carbon framework.

A method for manufacturing a catalysis reactant having high efficiency catalysis for thermal reaction primarily includes: preparing a three-dimensional catalysis carrier; preparing at least one aqueous-phase nanometer metallic particle solution; soaking the catalysis carrier in a methanol solution containing a silane group compound and removing and subjecting the catalysis carrier to drying and freezing for surface modification; soaking the catalysis carrier in the aqueous-phase nanometer metallic particle solution and removing and subjecting the catalysis carrier to blow-drying to have the surface of the catalysis carrier combined with a first layer of nanometer metallic particles; soaking the catalysis carrier in a methanol solution containing 1,12-dodecaneamino to carry out surface modification and removing and subjecting the catalysis carrier to drying, followed by soaking in the aqueous-phase nanometer metallic particle solution and then blow-drying to have the surface of the catalysis carrier further combined with a second layer of nanometer metallic particles.

The present disclosure provides an active zinc-based catalyst and a preparation method thereof, and use in catalyzing a rearrangement reaction of ibuprofen. The active zinc-based catalyst includes a carbon-based fiber material and nano-zinc oxide supported on a fiber surface of the carbon-based fiber material. The active zinc-based catalyst is introduced with the carbon-based fiber material, and the carbon-based fiber material is capable of increasing a specific surface area of the catalyst, thereby improving a dispersion degree of zinc oxide, increasing the number of catalytic active sites, and significantly improving a catalytic activity. Meanwhile, due to a certain mechanical strength, the carbon-based fiber material is capable of improving a mechanical strength of the catalyst, making the catalyst exist stably in ketal fluid, maintaining a stable morphology of the catalyst, and avoiding or inhibiting reduction of the catalytic active sites, thereby ensuring a catalytic stability.

A metal-supported nonwoven fabric is provided which enables effective synthesis of a target product when used as a catalyst in a flow reaction. The metal-supported nonwoven fabric comprises a nonwoven fabric containing polyolefin fibers or PET fibers, and metal particles. The nonwoven fabric has grafted side chains bound thereto formed of polyvinylpyrrolidone, polyacrylic acid, or a polymer containing functional groups with unshared electron pairs. The metal particles are supported by the grafted side chains via pyrrolidone groups of the polyvinylpyrrolidone, carboxy groups of the polyacrylic acid, or the functional groups with unshared electron pairs.

The present disclosure provides a noble metal-transition metal-based nano-catalyst thin film and a preparation method thereof, belonging to the fields of energy development and pollutant emission reduction. Based on a micro-nano processing technology, a noble metal-transition metal-based nano-catalyst thin film is loaded on a semi-cylindrical pipe with an inner thread structure, and heat generated is quickly accumulated on an upper surface of the catalyst to establish a large temperature gradient. By the insulation and high roughness of an alumina carrier layer and the inner thread structure of the pipe, a catalyst loading area is maximized and dispersion of noble metal atoms is enhanced. A transition metal-transition metal oxide thin film protects a noble metal nano-catalyst by core-shell wrapping, and a transition metal oxide prevents catalyst deactivation caused by oxygen occupying too many metal active sites.

The present invention belongs to the field of sewage treatment, and relates to a method for preparing a modified natural wood material and an application thereof in sewage treatment. The method for preparing the modified natural wood material includes the following steps: S1. placing wood into a lignin removal solution, after a heating reaction, washing, impregnating, and lyophilizing the wood to obtain removed lignin wood; S2. blending TiO.sub.2 with NaBH.sub.4, performing low-heat reduction treatment, and then washing and drying to obtain reduced black titanium; S3. dispersing the reduced black titanium ultrasonically in a solvent, then coating dropwise on the removed lignin wood, and drying to obtain a modified natural wood material. The modified natural wood material prepared by the present invention has high disinfection and sterilization performance, and has the ability to remove bio-risk components.

Proposed inventions are a recipe of denitrification-oxidation complex catalyst containing an SCR catalyst and an oxidation catalyst to simultaneously remove nitrogen oxides, carbon monoxide, hydrocarbons, and ammonia, a manufacturing method thereof, an exhaust gas treatment method using the denitrification-oxidation complex catalyst, and an SCR denitrification system including the denitrification-oxidation complex catalyst. The denitrification-oxidation complex catalyst simultaneously removes nitrogen oxides, carbon monoxide, hydrocarbons, and ammonia and exhibits an increased catalytic effect compared to the cases where the denitrification catalyst used alone and the denitrification and the oxidation catalyst ratios are and not properly balanced. When the denitrification-oxidation complex catalyst is applied to an SCR denitrification system, the structure is simplified, space is saved, cost is reduced, and catalyst maintenance is easy.

The present application relates to a composite structure, a method of manufacturing the composite structure, and a catalyst including the same. In the composite structure of the present application, metal nanoparticles having a very small size are uniformly formed at a high density regardless of a type of metal. The method of manufacturing the composite structure of the present application can quickly prepare the composite structure in which metal nanoparticles having a very small size are formed uniformly at a high density regardless of the type of metal.