Honeycombed SCR (selective catalytic reduction) denitrification catalyst for low-temperature flue gas denitrification and preparation method thereof

Abstract

The invention discloses a honeycombed SCR (selective catalytic reduction) denitrification catalyst for low-temperature flue gas denitrification and a preparation method of the honeycombed SCR denitrification catalyst. According to the method, mixed powder of nano-anatase titanium tungsten powder and titanium silicon powder is used as a carrier of the catalyst; active components include metal compounds containing manganese, cerium, iron and zirconium; additives include an acid solution, an alkali solution, a structural promoter and a binder; and the honeycombed SCR denitrification catalyst, based on 100 parts of carrier, is prepared by the following raw materials by mass: 100 parts of carrier, 3-10 parts of manganese-containing precursor based on manganese, 1-6 parts of cerium-containing precursor based on cerium, 1-6 parts of iron-containing precursor based on iron, 0.5-8 parts of zirconium-containing precursor based on zirconium, 0.8-3 parts of acid solution, 5-15 parts of alkali solution, 11-29 parts of structural promoter, 1-6 parts of binder, and 13-26 parts of water. According to the catalyst prepared by the preparation method provided by the invention, the low-temperature (at 80-120 DEG C) activity of the SCR denitrification catalyst is effectively improved, and the strength and the molding rate of the monolithic honeycombed SCR denitrification catalyst are greatly improved.

Description

technical field [0001] The invention relates to the technical field of nitrogen oxide treatment, in particular to a honeycomb SCR denitration catalyst with high catalytic activity at low temperature and a preparation method thereof. Background technique [0002] Nitrogen oxides (NOx) are key pollutants to achieve multi-environmental objectives and comprehensively improve the quality of the atmospheric environment. They can cause acid deposition, trigger photochemical smog, accelerate the greenhouse effect, and seriously endanger human health. At present, my country's total NOx emissions have exceeded 18 million tons. If effective control measures are not taken, it is expected that my country's NOx emissions will increase rapidly in the next ten years, and will reach more than 30 million tons by 2020, which will undoubtedly become the world's No. A major NOx emitter. [0003] Among the numerous flue gas denitrification methods, selective catalytic reduction (SCR) technology i...

AI Technical Summary

Problems solved by technology

However, since the active material is loaded by impregnation, the active material is easy to fall off

The patent with application number 200510031743.6 uses TiO 2 It is a carrier, and the active components are oxides of Mn and variable valence metal iron or copper or vanadium or cerium or chromium, and the activity is close to 100% at 120 ° C, but the catalyst prepared by this method is granular and has great potential in industrial applications. big limitations

Patent application number 201010559955.2 to load TiO 2 -SiO 2 The coated cordierite honeycomb ceramic is used as the carrier, and the active components are oxides of Mn, Fe, Ce, Zr, W and other elements. 54.4%

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