Anti-water and anti-sulfur denitration catalyst, preparation method and application thereof

Abstract

The invention relates to an anti-water and anti-sulfur denitration catalyst, a preparation method and application thereof. The catalyst includes titanium dioxide and an additive, both of which are used as the main components, wherein the additive is a combination of any four or more of zirconium oxide, copper oxide, molybdenum oxide, cerium oxide, iron oxide, nickel oxide, cobalt oxide, and tungsten oxide; the surface of the catalyst is coated with a silica coating; the catalyst can be used in the selective catalytic reduction (NH3-SCR) and purification processes of the nitrogen oxides in the flue gas of a stationary source and mobile source. The catalyst adopts non-toxic and harmless raw materials, and has the advantages of being simple and convenient in preparation method, high in catalytic activity, wide in active window, resistant to SO2 poisoning and vapor poisoning for a long time, and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a water-resistant and sulfur-resistant denitration catalyst, a preparation method and an application thereof. Background technique [0002] With the development of my country's economy, the energy consumption, especially the consumption of fossil energy, has increased significantly. Correspondingly, the degree of air pollution is also increasing day by day, and the energy structure dominated by coal is the main factor affecting the quality of my country's air environment. At present, more than 95% of thermal power plants in my country are mainly coal-fired, and it is difficult to change in the short term. Sulfur dioxide, carbon dioxide, nitrogen oxides and dust emitted during coal combustion account for 87%, 71%, 67% and 60% of my country's emissions, respectively. my country's energy consumption accounts for 8% to 9% of the world's total, but NO x The...

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Problems solved by technology

[0004] CN103071506A discloses an iron-cerium-titanium composite oxide catalyst, using excess urea as a precipitating agent, in the absence of SO 2 In the presence of water, the space velocity is 50000h -1 At 300-400 ° C, the denitrification efficiency can reach more than 85%, and the selectivity is 100%. However, this prior art has not investigated its water resistance and anti-sulfur performance, and has not investigated the catalyst in the presence of water and sulfur at the same time. Excellent water and sulfur resistance stability

However, the space velocity of the catalyst is low and the test time is short, which cannot truly reflect the stability of the catalyst under the simultaneous presence of sulfur and water.

CN101785994A discloses a nanocrystalline cerium-titanium composite oxide catalyst for the selective reduction of nitrogen oxides by ammonia, the catalyst is passed through 100ppmSO 2 , airspeed is 150000h -1 At 350°C, its activity can reach 98%, but the flue gas test condition of the catalyst does not pass water, and the long-term sulfur resistance performance of the catalyst has not been tested.

However, the non-vanadium denitration catalysts disclosed in the above prior art also have anti-SO 2 and H 2 O the problem of poor stability

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