5results about How to "Improve denitrification activity" patented technology

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 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 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.