15results about How to "Improve denitrification activity" patented technology

The invention relates to the technical field of flue gas denitration catalysts, in particular to a high-temperature denitration catalyst and a preparation method thereof.The preparation method comprises the following steps that a titanium source, an aluminum source and an alcohol polymer are added into absolute ethyl alcohol, heating and stirring are conducted, and a mixed solution is obtained; the preparation method comprises the following steps: dropwise adding a mixed solution of absolute ethyl alcohol and distilled water into the mixed solution, hydrolyzing to obtain initial gel, and drying and roasting the initial gel to obtain a nanosheet TiO2-Al2O3 oxide; the preparation method comprises the following steps: dipping a nano flaky TiO2-Al2O3 oxide into a vanadium source and a molybdenum source, and then carrying out drying and roasting treatment, so as to obtain the V2O5-MoO3 / TiO2-Al2O3 high-temperature denitration catalyst. The high-temperature denitration catalyst prepared by the invention has excellent denitration activity and sulfur resistance under the condition of high-temperature and high-sulfur flue gas, and effectively solves the problems of poor denitration activity and sulfur resistance of the existing denitration catalyst under the condition of high temperature.

The invention discloses a gas turbine SCR denitration catalyst and a preparation method and application thereof. The denitration catalyst comprises: a carrier component TiO2, an active component V2O5, and auxiliary agents MoO3 and Cr2O3; wherein the mass percentage of the active component V2O5 is 1-18%wt% of the mass of TiO2; the mass percentage of the auxiliary agent MoO3 is 1-10%wt% of the mass of TiO2; and the mass percentage of the auxiliary agent Cr2O3 is 1-10%wt% of the mass of TiO2. In the invention, the introduction of Cr2O3 is beneficial to activating oxygen molecules and improving the migration ability of oxygen, thereby promoting the SCR denitration activity of the catalyst; Cr2O3 has a synergistic effect with V2O5 and MoO3, the specific surface area of ​​the catalyst is increased, the Lewis acid sites are increased, and the high dispersion of the active component V2O5 on the catalyst surface is promoted.

The dust removal and denitration composite filter bag integrally comprises a plurality of functional filter bag sections and a plurality of connecting parts, the functional filter bag sections are linearly arranged from top to bottom, each connecting part is arranged between each two adjacent functional filter bag sections, and each functional filter bag comprises a metal film catalysis filter bag and a metal film filter bag; the first section of the dust removal and denitration composite filter bag is the metal film catalysis filter bag, and the rest are the metal film filter bags; the connecting part is of a flange structure, and a coating type SCR honeycomb catalyst is embedded in the flange structure. According to the special structural design of the dust removal and denitration composite filter bag, the dust removal and denitration composite filter bag has good dust removal precision and denitration activity in a wide temperature range, the risk of catalyst deactivation and bag pasting can be reduced while the stable denitration efficiency is improved, and the production and manufacturing cost can be remarkably reduced.

The invention discloses a denitration catalyst with high sulfur resistance and water resistance and a preparation method thereof, the catalyst comprises a modified carrier and active components loaded on the modified carrier, the modified carrier comprises fly ash, titanium dioxide and iron powder, and the active components comprise vanadium oxide and tungsten oxide. The iron-modified fly ash partially replaces titanium dioxide to serve as a carrier of the catalyst, vanadium and tungsten active components are loaded, the obtained denitration catalyst shows excellent sulfur resistance and water resistance, meanwhile, the catalyst further has a wide active temperature window and high nitrogen selectivity, the preparation process is simple, operation is easy, cost is low, and the catalyst is suitable for industrial production. The method has high environmental value and economic value.

The invention discloses a fiber ceramic-based catalytic filter element for denitration of industrial flue gas and a preparation method of the fiber ceramic-based catalytic filter element, and belongs to the technical field of catalytic filter elements. According to the preparation method, firstly, a chelating agent is introduced in the preparation process of TiO2 sol to improve the dispersity and particle size uniformity of TiO2 nanoparticles, the chelating agent can effectively adjust the hydrolysis rate of butyl titanate by means of the strong coordination acting force of the chelating agent and titanium ions, and high-dispersity and small-particle-size TiO2 sol is constructed; then, the fiber ceramic base material is immersed in the TiO2 sol, a firm TiO2 coating is formed after calcination, the firm TiO2 coating serves as a carrier with a high specific surface area, and the binding force between the firm TiO2 coating and the base material is enhanced; the preparation method comprises the following steps: firstly, preparing a TiO2 coating, then dipping a solution containing vanadium and tungsten precursors onto the composite carrier, and calcining to form a main active component V2O5 and a cocatalyst WO3 which are highly dispersed on the surface of the TiO2 coating to form selective catalytic reduction active sites, thereby finally obtaining the fiber ceramic-based catalytic filter element which is good in blocking resistance, water-resistant, sulfur-resistant and high-temperature-resistant and can be used for industrial flue gas denitration.

The utility model provides a denitration catalyst paste preparation system, which comprises a water tank (1), a saline solution tank (2) and a mixing tank (6), the water tank (1) and the saline solution tank (2) are respectively connected with the mixing tank (6), a high shear stirrer (5) is arranged on the mixing tank (6), a titanium dioxide storage tank is connected onto the mixing tank (6), a discharge port of the mixing tank (6) is connected with an evaporation tank (7), a discharge port of the evaporation tank (7) is connected with a mixing tank (8), and the mixing tank (8) is connected with an air inlet of the evaporation tank (7). The mixing tank (8) is connected with a binder storage tank, and an exhaust port of the evaporating tank (7) is connected with the water tank (1). The device is simple in process, can realize full mixing of active components, auxiliaries and carriers through high-shear reinforced mixing, ensures high denitration activity and stability of the catalyst, and is suitable for preparing denitration catalyst paste with different structures and types.

The invention relates to the technical field of air pollution control, and discloses an SCR denitration catalyst end hardening liquid and a hardening method thereof. The hardening liquid for the end part of the SCR denitration catalyst contains an active component, a binder, a dispersion stabilizer, a hardening agent and water, and on the basis of the total weight of the hardening liquid for the end part of the SCR denitration catalyst, the content of the active component is 0.2-8 wt%, the content of the binder is 1-15 wt%, the content of the dispersion stabilizer is 2-35 wt%, and the content of the hardening agent is 3-40 wt%. The content of water is 2 to 93.8 weight percent; wherein the active component is a combination of ammonium metavanadate and ammonium heptamolybdate and / or vanadyl sulfate, and the weight of the ammonium metavanadate accounts for 35-80% of the total weight of the active component; the hardening agent is at least two of aluminum sulfate, aluminum dihydrogen phosphate, zinc oxide, sodium borate and sodium silicate. According to the technical scheme, the structural strength and wear resistance of the end part of the catalyst can be greatly improved, and the overall service life of the catalyst is effectively prolonged.

The present application relates to a kind of modified biochar and its preparation method and application, first step, using bamboo to prepare biochar;Second step, preparation modified biochar;Third step, take anaerobic ammonia oxidation flocculation sludge in reactor, and add modified biochar in reactor.Using the method of the present application, the addition of modified biochar promotes the rapid granulation of anaerobic ammonia oxidation flocculation sludge can improve the denitrification activity and stability of anaerobic ammonia oxidation system at the same time, quickly realize the granulation of anaerobic ammonia oxidation flocculation sludge, and improve the relative abundance of anaerobic ammonia oxidation bacteria, has good theoretical guiding significance and practical application value for the cultivation of anaerobic ammonia oxidation granular sludge.

The present invention belongs to the field of catalysts, and specifically relates to a LEV zeolite catalyst, a preparation method and an application thereof. The preparation method adopts the following steps: (1) synthesizing an organic structure directing agent N,N-dimethylmorpholinium cation; (2) preparing LEV zeolite using N,N-dimethylmorpholinium cation as a directing agent; (3) subjecting the LEV zeolite to a two-step ion exchange to obtain a LEV zeolite catalyst. The preparation method provided by the present invention prepares LEV zeolite molecular sieves by using a new type of inexpensive organic structure directing agent, has a wide range of synthetic gels, reduces preparation costs, and has important significance in the field of actual chemical production.

The invention discloses a low-temperature sulfur-resistant ammonia-escape-resistant SCR flue gas denitration catalyst and a preparation method thereof. The catalyst comprises a carrier plant ash, and manganese oxide and cerium oxide loaded on the carrier, the plant ash contains carbonate, silicate and alkali metal oxide; the preparation method comprises the following steps: (1) combusting and refining the forestry waste to obtain plant ash powder; and (2) adding water into manganese salt and cerium salt to prepare a mixed solution, adding the plant ash powder obtained in the step (1) into the mixed solution, and uniformly mixing, drying and calcining to obtain the composite material. According to the catalyst, components such as carbonate, silicate and alkali metal in the plant ash are fully utilized, generation of residues is greatly reduced, the utilization rate of the plant ash is greatly increased, and the catalyst is high in denitration activity, wide in active temperature window, capable of keeping high denitration activity at the temperature of 100-300 DEG C, good in low-temperature sulfur resistance, high in ammonia conversion rate and low in cost. And the generation of escaping ammonia is effectively reduced.

The present invention relates to a method for preparing a high-space-velocity SCR denitration catalyst for a gas generator set, comprising the following steps: soaking a modified cordierite skeleton in a titanate compound solution, and then drying the soaked modified cordierite; impregnating the dried modified cordierite skeleton with a hydrophobic modified catalyst active powder slurry to obtain a catalyst precursor; vacuum drying the obtained catalyst precursor; and calcining the dried catalyst precursor to obtain a high-space-velocity SCR denitration catalyst. The present invention pre-treats the modified cordierite skeleton by using a titanate solution, and the hydrophobic V2O5-WO3 / TiO2 catalyst layer forms a chemical bond and action with the modified cordierite skeleton treated with titanate, thereby increasing the bonding force between the catalyst layer and the modified cordierite skeleton; at the same time, the catalyst active component hydrophobic V2O5-WO3 / TiO2 powder is highly dispersed on the modified cordierite, which greatly improves the catalyst denitration activity. The catalyst prepared by the present invention meets the requirements of high-space-velocity denitration of flue gas in gas generator sets.

The present invention belongs to the technical field of biological denitrification of sewage, and specifically relates to a strain of Pseudomonas marginalis and its application. Pseudomonas marginalis (Pseudomonas marginalis), characterized in that the strain is WS45, which was deposited in the General Microbiological Center of China Microbiological Culture Collection Administration on July 22, 2021, with a deposit number of CGMCC No.22943. Under 1-40°C conditions, the strain WS45 has heterotrophic nitrification-aerobic denitrification metabolic capabilities, and has a good removal effect on nitrate nitrogen, nitrite nitrogen and ammonium nitrogen in sewage. The strain has good adaptability to low temperatures and can be used for inorganic nitrogen pollution control in various water bodies such as medium and high concentration domestic sewage, livestock and poultry breeding wastewater or industrial organic wastewater in cold areas of my country. It has the advantages of being environmentally friendly and having a wide applicable temperature range.

The invention discloses a ZrO2 / γ-Al2O3 composite carrier and a preparation method thereof, a selective hydrodesulfurization catalyst and an application thereof. The composite carrier preparation method comprises: step 1, mixing zirconium oxychloride and water to obtain a zirconium-containing solution; step 2, adjusting the pH value of the zirconium-containing solution to alkaline, stirring, and aging; step 3, separating the aged material obtained in step 2 to obtain a solid, washing and removing Cl in the obtained solid; ‑ , obtaining a zirconium-containing hydrogel; step 4, mixing sucrose, pseudo-boehmite, the zirconium-containing hydrogel and water, heating, acid hydrolysis, to obtain a zirconium-aluminum sol; step 5, adjusting the pH value of the zirconium-aluminum sol to alkaline, aging, then washing with water to neutrality, solid-liquid separation, vacuum freeze drying, to obtain a zirconium-aluminum composite material; step 6, mixing the zirconium-aluminum composite material with an additive, molding, to obtain a ZrO2 / γ-Al2O3 composite carrier. The catalyst of the present invention has high DDS selectivity, low diesel hydrogenation reaction severity, and low hydrogen consumption.

The present application relates to the technical field of denitration catalyst, in particular to an arsenic-poisoning-resistant denitration catalyst and a preparation method thereof.The arsenic-poisoning-resistant denitration catalyst comprises a composite carrier, an active component and a catalyst promoter, the mass ratio of the active component to the composite carrier is (3-8):100, and the mass ratio of the catalyst promoter to the composite carrier is (2-10):100;the composite carrier comprises anatase TiO2, porous active calcium silicate and modified nano zinc oxide;the active component comprises vanadium oxide, neodymium oxide and yttrium oxide;and the catalyst promoter comprises molybdenum oxide, cerium oxide and nickel oxide.The arsenic-poisoning-resistant denitration catalyst can efficiently inhibit the poisoning of arsenic and alkali metals on the catalyst, can maintain excellent denitration activity in a complex flue gas environment for a long time, and can be widely applied to coal-fired power plants, biomass boilers, steel industries and the like.