Small-aperture corrugated catalyst for fuel gas denitration, and preparation method thereof

Abstract

The invention belongs to the technical field of flue gas denitration, and relates to a small-aperture corrugated catalyst for gas denitration, and a preparation method thereof. The catalyst adopts a glass fiber mat as a skeleton base material, one or two of titanyl sulfate and silicon oxide as a carrier, one or two of ammonium heptamolybdate and cerium salt as an assistant and one or more of a manganese salt, an iron salt and a chromium salt as an active component precursor and deionized water; and the catalyst comprises, by weight, 90 parts of the carrier, 1.6-6.5 parts of an active componentprecursor, 3.8-5.1 parts of the assistant and 120-200 parts of deionized water. The catalyst adopts the titanyl sulfate and silicon oxide as the carrier, so that the catalyst is ensured to have goodthermal stability at a high temperature, and crystal form change and sintering are avoided; the manganese salt, the iron salt and the chromium salt are used as active components, so hole blockage caused by high solution viscosity can be avoided; and the ammonium heptamolybdate and the cerium salt are used as modification aids, so that the catalyst has an extremely high catalytic performance in anSCR reaction.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification, and relates to a denitrification catalyst, in particular to a small-aperture corrugated catalyst for gas denitrification and a preparation method thereof. Background technique [0002] At present, the flue gas emitted by boilers fueled by natural gas has the characteristics of high temperature, low sulfur content, and almost no dust. Compared with coal-fired boilers, gas-fired boilers have the advantages of high combustion efficiency and low pollutant emission concentration. However, gas boilers also produce a small amount of nitrogen oxides during combustion. With the increasingly stringent air pollution control policies, in addition to adopting denitrification measures such as staged combustion and fuel reburning, flue gas denitrification such as SCR must be used to achieve emission standards. [0003] Due to the mature technology at home and abroad, SCR denitrification has b...

AI Technical Summary

Problems solved by technology

Due to the small-diameter catalyst wall and the large number of pores, the traditional honeycomb catalyst is difficult to extrude, the yield is low, and the consumption of carriers, active components, and additives is large, the specific surface area of ​​the finished product is low, and the weight is heavy, which increases the load requirements of the SCR system. , increasing the cost of the entire project; in addition, the finished denitrification catalyst powder is loaded by coating or direct impregnation, and the fluidity of the mixed solution is poor. For the production of catalysts with small pore diameters, it is easy to block pores, resulting in a large pressure drop when the product is used, and affect its performance

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