34results about How to "Improve low temperature denitrification activity" patented technology

The invention relates to a supported manganese based low-temperature denitration catalyst and a preparation method thereof. The preparation method comprises the following specific steps: (1) dissolving cerate, ferric salt or cobalt salt and manganous salt into water to form a metal salt solution, adding a nonionic surfactant, a cosurfactant and an organic solvent into the metal salt solution, and stirring till the solution is clear, thereby obtaining a microemulsion, wherein the molar ratio of the water to the nonionic surfactant to the cosurfactant to the organic solvent is equal to 1:(0.03-0.6):(0.1-1.2):(1-5); (2) adding titanium sol into the microemulsion, stirring, and regulating the pH of the microemulsion to 8-11 by a pH regulator, and heating to obtain xerogel; and (3) grinding and calcining the xerogel to obtain the denitration catalyst. According to the preparation method, active components of the catalyst are uniformly dispersed in a whole supporter, TiO2, and thus are all deposited on the supporter. The denitration catalyst has a wide temperature range of low-temperature activity and high catalytic activity.

The embodiment of the invention provides a thin-wall flat plate type low-temperature sulfur-resistant SCR denitration catalyst and a preparation method thereof. The catalyst is prepared by taking TiO2-Nb2O5-Fe2O3 composite nano oxide as a carrier, V2O5 as an active component and MoO3 and MnSO4 as active aids, adding organic and inorganic structural aids, and performing multi-stage rolling, dryingand the like. According to the catalyst disclosed by the invention, the low-temperature denitration performance and sulfur poisoning resistance are improved by developing a carrier for accelerating denitration reaction, promoting decomposition of ammonium sulfate salt, optimizing active ingredients and active aids, optimizing forming aids, a preparation process and the like so that the catalyst has excellent denitration activity and stability within a temperature range of 150-250 DEG C. Due to the plate thickness of 0.35-0.40 mm, the catalyst has relatively low sulfur dioxide oxidation rate and relatively strong sulfur poisoning resistance, the raw material cost required by production is greatly reduced, and the operation cost of an SCR denitration system is saved.

The invention belongs to the technical field of industrial flue gas denitrification, and in particular relates to a low-temperature denitrification catalyst and a preparation method thereof. The low-temperature denitration catalyst is based on one or more of transition metal cerium, vanadium, and copper oxyhalides as active components, and one or more of tungsten, molybdenum, and iron metal oxides are used as auxiliary components. The catalyst is prepared by using one or more of titanium dioxide, diatomaceous earth and alumina as a carrier, through polarization, mixing, extrusion, drying and firing. The catalyst of the invention has the advantages of low-temperature denitrification activity (150-250° C.), resistance to sulfur dioxide and water poisoning, high stability, and high mechanical strength of the catalyst, and is suitable for the treatment of atmospheric pollutants in non-electric industries.

The invention discloses a copper-doped phosphomolybdic acid low-temperature denitrification catalyst and a preparation method thereof, belonging to the technical field of air pollution control. A copper-doped phosphomolybdic acid low-temperature denitrification catalyst of the present invention, the catalyst adopts anatase TiO 2 As a carrier, the active component is composed of phosphomolybdic acid, copper nitrate, polyethylene glycol (PEG) and cetyltrimethylammonium bromide (CTAB); the preparation process of the catalyst is: phosphomolybdic acid, nitric acid Put copper, surfactant CTAB and PEG into the crucible to dissolve, dry, dry, and calcinate to obtain the active component, and then mix the active component with TiO 2 Put them together into a crucible filled with distilled water, stir, dry, dry, and calcinate to obtain a copper-doped phosphomolybdic acid low-temperature denitrification catalyst. Using the copper-doped phosphomolybdic acid low-temperature denitrification catalyst of the present invention can enhance the catalyst’s resistance to SO on the basis of ensuring the low-temperature denitrification efficiency 2 and water vapor capacity.

The invention belongs to the technical field of chemical industry, and is a preparation method of a low-temperature anti-sulfur denitrification catalyst. 2 The denitrification problem of flue gas, the catalyst of the present invention is doped iron modified TiO 2 Supported iron-manganese composite oxide catalyst, doped with iron and TiO 2 The molar ratio is 0.01:1~0.5:1, mixed by sol-gel method, and roasted in a reducing atmosphere to obtain a carrier, and the impregnation method is used to load 10% (mass ratio to the carrier, the same below) of Fe and 10 % Mn, the prepared denitration catalyst has a large specific surface area, high thermal stability, high denitration efficiency and good sulfur resistance, and is suitable for the catalyst containing a certain amount of SO 2 The field of nitrogen oxide removal in flue gas. The evaluation of simulated flue gas in the laboratory shows that when the air velocity is 30,000h ‑1 , NO 1000ppm and SO 2 Under the condition of 100ppm, in the range of 160~250℃, the removal rate of NO can reach more than 75%, and there is no SO 2 When it exists, the removal rate of NO at 160-250°C can reach more than 92%.

The invention discloses a low-temperature denitration catalyst with strong anti-sulfur water-resistant properties and a preparation method thereof. Anatase type TiO2 is used as a carrier of the catalyst and is used for loading an active component, oxygen vanadium phosphate; the mole ratio of V to P in the active component, oxygen vanadium phosphate, is (1-6):1; the weight of the active component, oxygen vanadium phosphate, in the catalyst is 5%-15% of the total weight of the catalyst. According to the invention, the method comprises the following steps: with V2O5 as an active precursor, isobutyl alcohol as a reducing agent and benzyl alcohol as a solvent, performing reflux reaction at 150 DEG C, then adding phosphoric acid at proper ratio, and heating and refluxing; leaching, drying and calcinating the reaction mixture, thereby acquiring the active component, oxygen vanadium phosphate; lastly, adding the prepared active component, oxygen vanadium phosphate, and anatase type TiO2 with the specific surface area not below 250m<2> / g as the carrier into distilled water at proper ratio, stirring and mixing, and performing water bath drying and calcining, thereby acquiring the catalyst. The catalyst disclosed by the invention has higher low-temperature denitration activity and strong property for resisting against SO2 and water vapor toxifying.

The invention belongs to the field of environmental protection technology and denitration catalysis, and in particular relates to a flat plate type wide temperature anti-sulfur SCR denitration catalyst and a preparation method thereof. The carrier of the catalyst of the present invention is a hollow sphere of titanium-cerium composite oxide, the active component of the catalyst is vanadium pentoxide, and the catalyst assistants are ferric oxide, molybdenum trioxide and barium sulfate; a two-step roll forming process is adopted : First, the catalyst promoter is loaded on the surface of the titanium-cerium composite oxide hollow sphere by the equal volume impregnation method, and then the catalyst active component vanadium pentoxide is loaded on the surface of the carrier, and the catalyst is formed into a flat plate by a roll forming process. A flat-plate SCR denitration catalyst with wide temperature resistance to sulfur poisoning was obtained. The catalyst of the invention has good catalytic activity and anti-sulfur poisoning performance in the range of 150-450 DEG C, and can solve the problem that the catalyst has low activity in low-temperature flue gas, sulfur poisoning and SO in medium-temperature flue gas. 2 The problem of high oxidation rate is suitable for wide temperature sulfur-containing flue gas denitrification.

The present invention relates to the technical fields of chemical engineering and environmental protection, and provides a denitration catalyst, which includes a carrier and manganese oxide loaded on the carrier, and the carrier includes zirconia and graphene oxide; wherein, the molar ratio of manganese oxide to zirconia is 3.5-4.5:1, the ratio of the total mass of manganese oxide and zirconia to the mass of graphene oxide is 1000:2-7. Provided is a method for preparing a denitration catalyst, comprising: drying a manganese source, a zirconium source and graphene oxide after hydrothermal reaction, and roasting after drying. The above-mentioned denitration catalyst and the denitration catalyst prepared by the above-mentioned method are suitable for a wide working temperature, and exhibit high activity under low temperature conditions. The present invention also provides a denitration method. The denitration catalyst mentioned above or the denitration catalyst prepared by the preparation method is used in the denitration process. The method is suitable for a wide range of denitration temperatures and can exhibit high activity even at low temperatures.