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.