Honeycomb low-temperature denitration catalyst and preparation technology thereof

Abstract

The invention discloses a honeycomb low-temperature denitration catalyst and a preparation technology thereof. The catalyst is prepared by a simple preparation technology and is easy to mould; in addition, the prepared catalyst is high in low-temperature activity and strong in resistance to water, sulfur and alkali (earth) metal poisoning; furthermore, a waste SCR catalyst is used as a raw material, so that the cost is low, resource utilization of the waste SCR catalyst can be achieved, and recycling of the waste SCR catalyst can be achieved.

Description

technical field [0001] The invention relates to a honeycomb low-temperature denitrification catalyst and a preparation process thereof. Background technique [0002] In the field of nitrogen oxide pollution control, selective catalytic reduction (SCR, selective catalytic reduction) is the most widely used flue gas denitrification technology. SCR denitrification catalyst with NH 3 As a reducing agent, the harmful nitrogen oxides in the flue gas are reduced to harmless nitrogen by means of catalytic effect. At present, low-temperature denitration catalysts have become a hot research topic in the field of SCR catalysts. [0003] The active components of the currently researched low-temperature SCR catalysts are mainly transition metals. Mn element has a variety of valence states, and the activation energy required for transition between valence states is low, so it has excellent denitrification performance at low temperature. The low-temperature denitrification catalyst acti...

AI Technical Summary

Problems solved by technology

[0003] The active components of the currently researched low-temperature SCR catalysts are mainly transition metals. Mn element has a variety of valence states, and the activation energy required for transition between valence states is low, so it has excellent denitrification performance at low temperature. The low-temperature denitrification catalyst active component, but its water resistance and sulfur resistance are poor, and whether manganese nitrate or manganese hydroxide is used in the production process, the product produced will burst due to the low decomposition temperature (200 ° C), and the mechanical strength is poor , leading to difficulty in forming honeycomb and high production cost

[0004] Patent CN 201610056551.9 discloses a honeycomb monolithic low-temperature denitration catalyst and its preparation process. It immerses transition metal (iron, cobalt, copper, nickel, manganese, cerium) salts into titanium dioxide to form a suspension, and then mixes it with other additives. The agent is made into a slurry, coated on a honeycomb cordierite carrier, and then dried and calcined to obtain a honeycomb monolithic low-temperature denitration catalyst. However, the active components of the low-temperature denitration catalyst are easily worn out in low-temperature high-dust flue gas, and it is difficult to apply industrially. The preparation process is complicated and the cost is high

[0005] Patent CN 201611002394.X discloses a preparation process of a honeycomb Mn-based low-temperature denitrification catalyst. It calcines the carrier and active components manganese, cerium and iron salts to form a powdery material, and then extrudes to obtain a manganese-based honeycomb low-temperature denitrification catalyst. catalyst, but the low-temperature denitrification catalyst has poor sulfur resistance, and the influence of water on the catalyst has not been investigated, so it is easy to deactivate

[0006] Patent 201711195037.4 discloses a preparation process of an alkali poisoning-resistant copper-based spinel low-temperature denitrification catalyst, which forms a solution of copper salt, metal salt, metal salt, distilled water and mixed acid solution, then dries, and calcines in an oxygen-enriched atmosphere A copper-based spinel low-temperature denitrification catalyst resistant to alkali poisoning was obtained, but the low-temperature denitrification catalyst was a powder sample without molding, and the influence of water on the catalyst was not investigated, so it was difficult for industrial application

Images