51results about How to "Wide reaction temperature window" patented technology

The invention provides a nitrogen oxide degrading film and a preparation method thereof. The degrading film comprises the following main raw materials: cerium acetylacetone, barium acetylacetone, potassium fluoride, melamine and graphene. The preparation method comprises the following steps: preparing F-and-N codoped BaCeO3 from cerium acetylacetone, barium acetylacetone, potassium fluoride and melamine by using a sol-gel process; mixing graphene with the F-and-N codoped BaCeO3 to obtain precursor powder; and carrying out pouring and film forming so as to obtain the nitrogen oxide degrading film. Thus, the nonmetal-modified inorganic degrading film prepared by using the sol-gel process has a more efficient and stable current utilization rate and is applicable to high-selectivity electrocatalytic degradation of nitrogen oxide.

The invention discloses a preparation method of a Mn-based rodlike microtopography composite oxide low-temperature denitrification catalyst, and belongs to the field of pollution control and techniques. The preparation method comprises the following steps of dissolving salt precursors of metal elements into distilled water to prepare a salt solution by taking MnOx as a catalyst and one or more of Ag, Cu, Fe, Ce and Co as additives, wherein NiOx is the important active component of the catalyst; and meanwhile, preparing a urea aqueous solution, mixing the salt solution and the urea aqueous solution uniformly, stirring and crystallizing at the reaction temperature of 50-120 DEG C for 4-12 hours, filtering, washing, drying, and forging and the like to prepare the Mn-based rodlike microtopography composite oxide low-temperature denitrification catalyst. The catalyst is applied to the selective catalytic reduction (NH3-SCR)NO by adopting NH3 as a reducing agent. The Mn-based rodlike microtopography composite oxide low-temperature denitrification catalyst has good low-temperature denitrification performance, is simple and convenient to prepare, is mild in condition, and has good application value in the denitrification field based on the NH3-SCR technique.

The invention provides a CO low-temperature oxidation catalyst. The catalyst is characterized in that the catalyst consists of a CeO2-TiO2 compound oxide carrier and an active component of CuO, and the loading capacity of the active component of CuO is 1 to 20 weight percent, wherein the range of the mol ratio of TiO2 to CeO2 is 0.1-4. The coprecipitation method is adopted to prepare the cerium-titanium compound oxide carrier, and a copper nitrate solution is steeped on the carrier. The catalyst prepared by the method has highly efficient catalytic activity, and can realize the complete removal of CO in the temperature range of between 80 and 170 DEG C, and the highest selectivity reaches 100 percent; moreover, the catalyst also has good waterproof and CO2 resistant performances. The method has the advantages of simple preparation conditions, low production cost, and the like.

The invention discloses a catalyst for purifying waste incineration flue gas. The catalyst uses vanadium pentoxide, platinum oxide and tungsten oxide as active components, γ-alumina, titanium dioxide and carbon nanotubes as carriers, and manganese oxide One or more of , iron oxide, copper oxide, tin oxide, and cerium oxide are coagents. The catalyst of the invention not only has the function of decomposing dioxins and chlorobenzene compounds, but also has the function of denitrification and anti-sulfur, and still has excellent removal ability for dioxins and NOx at relatively low temperature. The invention also discloses a preparation method of the catalyst for purifying waste incineration flue gas. The preparation method has the advantages of simple operation, convenience and controllability, and is suitable for large-scale industrial production.

The invention discloses a preparation method of a tung oil-based aqueous polyurethane coating. The preparation method comprises the following steps: mixing tung oil, carboxylic acid, an acid catalyst and a hydroxylation reagent in proportion, and heating the obtained mixture to 35-45 DEG C; dropwise adding a hydrogen peroxide solution while intense stirring, controlling the dropwise adding speed to keep the reaction carried out at 40-65 DEG C, and keeping the reaction for 3-5 h after the dropwise addition is finished; standing and layering the obtained reaction solution after the reaction ends, separating the obtained water phase, neutralizing the water phase, washing the neutralized water phase with water, and carrying out reduced pressure distillation to obtain tung oil polyol; and uniformly mixing the tung oil polyol, a hydrophilic modifier and acetone in proportion, adding diisocyanate, carrying out a reaction at 50-70 DEG C for 2-5 h, cooling the obtained reaction product to room temperature, adding a neutralizer to form a salt, adding a diamine chain extender and deionized water mixed solution, carrying out a chain extension reaction until no free isocyanate radicals exist, and carrying out reduced pressure distillation to remove the acetone in order to obtain the tung oil-based aqueous polyurethane coating. The preparation method has the advantages of effective improvement of the hydrophobicity and the moisture resistance of the aqueous polyurethane coating, and renewable and nontoxic raw materials.