7results about How to "High low temperature activity" patented technology

The invention relates to a preparation method and application of a rare earth element-containing precious metal tritium oxidation catalyst. The preparation method comprises the following steps: preparing a gamma-Al2O3 carrier containing rare earth elements; and loading noble metal on the surface of the gamma-Al2O3 carrier by adopting a deposition-precipitation method to obtain the catalyst, immersing the catalyst into a solution containing a nonionic surfactant for surface modification; and roasting the modified catalyst to obtain the tritium oxidation catalyst. According to the invention, the catalytic performance under a high-humidity condition is improved by firstly loading the rare earth element, then loading the noble metal and finally modifying through the nonionic surfactant, and the low-temperature activity of the catalyst is improved through a composite active site formed by loading the rare earth element and the noble metal; and meanwhile, the reaction activity under the condition of low tritium concentration and the reaction activity under the conditions of high humidity and large air volume are also improved.

The application discloses a calcium carbide furnace tail gas deep purification process. The calcium carbide furnace tail gas is firstly subjected to wet desulfurization and dehydrocyanation and TSA treatment, and then sequentially enters a de-fluorine and de-hydrocyanation reactor, a hydrolysis desulfurization reactor, a fine desulfurization reactor, a de-phosphorus and de-arsenic reactor, a de-oxygen reactor and a de-hydrocarbon reactor. After the treatment process, the HCl content in the gas is less than 0.1 ppm, the HF content is less than 0.1 ppm, the HCN content is less than 0.1 ppm, the total sulfur content is less than 0.1 ppm, the AsH3 content is less than 5 ppb, the PH3 content is less than 5 ppb, the oxygen content is less than 10 ppm, and the unsaturated hydrocarbon content is less than 0.1 ppm, thereby meeting the separation and purification requirements of subsequent processes, and the pressure drop of the whole process is not more than 100 kPa. The process can remove oxygen and unsaturated hydrocarbons in the gas under low-temperature conditions, thereby reducing the occurrence of side reactions, and has the characteristics of reasonable process design, high purification precision, low energy consumption and low operation cost.

This invention belongs to the field of environmentally friendly fuel technology, specifically relating to a method for preparing a green, low-carbon, and highly efficient modified fuel for alcohol-hydrogen engines. This invention comprehensively improves fuel performance through a progressive synergistic architecture of a bio-methanol platform – an oxygen-containing combustion-promoting system – a stability barrier – and a low-energy-consumption blending path. Using bio-methanol as a base, it optimizes combustion by compounding with oxygen-containing components such as 2-MTHF and DMM / MF, achieving rapid ignition, emission reduction, and noise reduction. Phase behavior is regulated by isobutanol and polyether-modified silicon, achieving a reversible and stable phase without the need for high-HLB surfactants, preventing deposition and gas lock. A four-fold protective barrier is constructed using GMO and fluorinated silica polyethers, combined with antioxidant synergy to achieve corrosion resistance and aging resistance. The process adopts a sequential design of front-end purification – mid-stage two-phase construction – and end-stage static mixing, achieving low-energy homogenization and ensuring storage, transportation, and operational stability.

The invention relates to the technical field of catalysts, and discloses a carbon dioxide methanation catalyst and a preparation method thereof, and a carbon dioxide methanation reaction method, the catalyst comprises a TiO2 carrier, and an auxiliary agent component and an active metal component loaded on the TiO2 carrier; wherein the TiO2 carrier comprises anatase type TiO2 (titanium dioxide) and rutile type TiO2 (titanium dioxide); the auxiliary agent component is selected from at least one of alkaline earth metal and rare earth metal; the active metal component is ruthenium. According to the carbon dioxide methanation catalyst provided by the invention, the mixture of anatase type TiO2 and rutile type TiO2 is adopted as the catalyst carrier, and through the synergistic effect of the TiO2 carrier, the auxiliary agent component and the active metal component, the dispersity and high-temperature stability of the active metal component can be improved, and the low-temperature activity of the catalyst in a carbon dioxide methanation reaction can be improved.

The application relates to the technical field of sewage treatment, and discloses a biological filter rotating disc system based on replaceable composite fillers and a nitrogen and phosphorus removal method. 2+ The biological filter rotating disc system supports online filler replacement and is suitable for upgrading and reconstruction of sewage plants and advanced treatment of industrial wastewater.

The application discloses a kind of cobalt-containing multimetal bimodal pseudo-boehmite and its preparation method, and the preparation steps include: when pseudo-boehmite is prepared using hydrothermal method, water-soluble cobalt compound and water-soluble silver compound are added to aluminum source;Then through forming, shade drying, drying and calcination treatment obtain multimetal improved pseudo-boehmite finished product, and non-metal modifier is added in the forming process;Multimetal improved pseudo-boehmite finished product is immersed in potassium citrate solution, and acid-base adjustment is carried out to increase the basicity of carrier;Multimetal improved pseudo-boehmite after acid-base adjustment is used as carrier and is immersed in aqueous solution of molybdenum compound;Finally, after shade drying, drying and calcination, cobalt-containing multimetal bimodal pseudo-boehmite catalyst is obtained.The preparation method designed by the application makes the distribution of cobalt and molybdenum in the catalyst more uniform, and the molybdate impregnation process is simple and controllable, which is conducive to improving the performance of the catalyst.

The application discloses a low-temperature denitration catalyst and a preparation method thereof, and belongs to the technical field of flue gas denitration catalysts. 60 The catalyst is prepared by doping fullerene C 60 The pi electron system of C 60 is highly delocalized on the three-dimensional curved surface thereof, so that C 60 has excellent electron transfer capacity; and the doping proportion of C 60 can effectively promote the rapid progress of the catalytic reaction. Therefore, the catalyst prepared by the application can be applied to low-temperature flue gas denitration, can significantly improve the denitration efficiency, can widen the active temperature range of the catalyst, and can solve the problems of poor low-temperature activity, insufficient sulfur resistance and easy poisoning of traditional catalysts.