38results about How to "Developed specific surface area" patented technology

A method for reducing and preparing nano molybdenum-copper composite powder with low temperature comprises two steps: step 1, preparing molybdenum-copper oxide precursor, and step 2, preparing nano molybdenum-copper composite powder. In step 1, a water solution of molybdenum salt and an ammonia water solution of copper salt are mixed, the mixed solution is heated through micro-wave heating for fast concentration, and resolvents are removed to obtain molybdenum-copper oxide precursor powder; and in step 2, molybdenum-copper oxide precursor powder is heated to be 325 to 400 DEG C, calcined, taken out of a stove, cooled by air, and then heated to 525 to 625 DEG C for reducing after being placed in an H2 atmosphere, so as to obtain nano molybdenum-copper composite powder. The nano molybdenum-copper composite powder prepared according to the method has the advantages that the specific surface area is large; the crystal grains are fine and the purity is high. As molybdenum-copper oxide precursor powder is prepared by combining a simple and effective liquid phase chemical method with micro-wave heating, and nano molybdenum-copper composite powder is prepared through calcining and reducing, the method provided by the invention is simple and fast; the process is easy to control; the powder yield is large; the efficiency is high; the reducing temperature of powder is greatly reduced; and suitability for industrialized mass production is realized.

The invention discloses a preparation method for a para-aminophenol ordered mesoporous carbon catalyst. The preparation method is characterized in that chitosan is taken as a raw material, and non-precious metal compounds are used as a doping source, meanwhile, a triblock copolymer surfactant is added, after performing self-produced high pressure treatment under a high temperature hydrothermal condition, filtering is performed so as to obtain a dark brown solid product, the solid product is dried, ground, and then put into a tubular calcinator, and high temperature carbonization under inert gas atmosphere protection is performed, so as to obtain a high-stable metal-doped carbon-based catalyst with different ordered mesoporous structures. The catalytic efficiency of the high-stable metal-doped carbon-based catalyst for para-nitrophenol hydrogenation catalysis generating para-aminophenol is investigated. The operation process has the main characteristics that the biomass resource chitosan is used as a raw material and is environmentally friendly, cheap and available; the surfactant is added, so that the formation of the ordered mesoporous structure is effectively controlled, the effective contact area between the reactant and the catalyst is increased, and the reaction conditions are mild; an active center and a carbon material are generated simultaneously, so that the structureis more stable, and the reaction process operationis simple.

The invention relates to preparation of a catalyst, in particular to a carbon-based solid acid catalyst and a preparation method thereof. The carbon-based solid acid catalyst has a pore size distribution of 3-50nm, a BET (Brunauer, Emmett and Teller) specific surface of 40-80m<2> / g and an acid value of 0.82-1.52mmol / g. The carbon-based solid acid catalyst is used for thermally decomposing granular carbon-based sulfonic acid under the temperature at 300 DEG C. The preparation method for preparing the carbon-based solid acid catalyst according to claim 1 is characterized by comprising the following steps of: preparing a modified coal precursor; preparing a compounding raw material; and carbonizing and sulfonating to obtain the solid acid catalyst. The carbon-based solid acid catalyst provided by the invention has the advantages that the preparation process is simple; the adopted raw materials are low in cost and easily obtained; based on a lyophobic amorphous carbon structure which is obtained by calcining an ultralow ash Taixi coal compound, a sulfo group is connected, and thus the carbon-based solid acid catalyst has porosity characteristic, developed mesopores, increased specific surface area and excellent heat stability; and the catalytic activity of the carbon-based solid acid catalyst is higher than that of the traditional acid catalyst, and the carbon-based solid acid catalyst is reusable and easy to be recovered.

The invention belongs to the field of preparation of composite fibers, and relates to an ethylene urea / polyvinyl alcohol composite formaldehyde-removing fiber as well as a preparation method and application thereof. Uniformly mixing polyvinyl alcohol, glycerol and ethylene urea, and standing to fully swell to obtain a spinning solution; and carrying out melt spinning on the spinning solution to obtain the ethylene urea / polyvinyl alcohol composite formaldehyde-removing fiber. According to the invention, polyvinyl alcohol is plasticized and modified by using a glycerol and ethylene urea composite plasticizer, and then the ethylene urea / polyvinyl alcohol composite formaldehyde-removing fiber is prepared by using a melt spinning process, so that some procedures in a solution spinning process, such as dissolution of a polymer, filtration of a spinning solution and recovery of a solvent, are omitted; meanwhile, no solvent participates in the spinning process, so that the harm to the environment is reduced. The method is simple in production process, small in environmental pollution and low in production cost.

The invention provides a method for processing industrial wastewater by a membrane separation / catalytic degradation composite process. The method comprises the following steps that 1, the industrial wastewater with the COD (chemical oxygen demand) greater than or equal to 10000mg / L is subjected to membrane separation treatment, and substances such as suspended matters, polymers and oil in sewage are removed; 2, filtrate after membrane separation is subjected to electric catalytic treatment, organic pollutants in water are degraded, and in addition, harmlessness or mineralization is realized for metal ions in the water; 3, the filtrate is further subjected to photoelectrocatalysis treatment, and pollutants in the water are degraded until the COD of the treated water is smaller than or equal to 90mg / L. The method has the advantages that the process is simple, the operation is safe, the control is easy, the membrane separation technology and the catalytic degradation technology are combined, the problems of time consumption, energy consumption and low efficiency of the simple membrane separation treatment method are solved, meanwhile, the difficult problem that useful matters in the sewage cannot be easily recovered and reutilized by the catalytic degradation treatment method is solved, and in addition, the obvious decontamination and purification efficiency is realized.