Flue gas denitration catalyst applied at a low temperature and preparation method thereof

Abstract

The invention relates to a catalyst and a preparation method thereof, in particular to a flue gas denitration catalyst applied at a low temperature and a preparation method thereof. TiO2 doped with one or multiple of Al2O3, SiO2 or ZrO2 is taken as a carrier, glass fiber is taken as a skeleton, and vanadium compounded with one or multiple of tungsten, molybdenum, cerium, manganese, niobium or phosphorus is taken as an active component. The flue gas denitration catalyst comprises the carrier, active precursor aqueous solution, glass fiber, stearic acid, lactic acid, wood pulp, monoethanolamine, polyoxyethylene, methylcellulose, ammonia water and water. The catalyst has good low-temperature denitration activity; and within the temperature of 150-300 DEG C, denitration efficiency of the catalyst is up to 85% or above. The catalyst has high sulfur-poisoning resistance and water-poisoning resistance capacity, and long-term use of the catalyst at a low temperature is guaranteed. Further, the catalyst can be applied to fields such as glass production, coking, cement, industrial kilns, waste incineration and chemical engineering widely. The invention further provides a preparation method of the catalyst, which is reasonable in processing.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a flue gas denitrification catalyst used under low temperature conditions and a preparation method thereof. Background technique [0002] With the increasingly stringent environmental protection requirements, in addition to coal-fired power stations, waste gas discharged from glass, coking, cement, industrial kilns, waste incineration and chemical plants also needs to be denitrified. Among many denitrification methods, selective catalytic reduction (SCR) technology is widely used due to its high denitrification efficiency and good selectivity. This technology is mainly based on the use of NH 3 As a reducing agent, the NOx in the flue gas (mainly NO and NO 2 ) is reduced to N 2 , while generating H 2 O. The core component is the denitration catalyst. The key to the success of this technology is the activity, selectivity and life of the denitration catalyst under ...

AI Technical Summary

Problems solved by technology

Compared with coal-fired power stations, the temperature of flue gas emitted by glass, coking, cement, industrial kilns, waste incineration and chemical plants is lower (often the flue gas emitted by waste heat boilers), and the temperature range is concentrated at 150~ Between 300°C (Note: The activity of the denitrification catalyst decreases with the decrease of temperature), SO 2 and H 2 The concentration of O is high, and the operation fluctuates greatly (the fluctuating operation will lead to large fluctuations in the temperature of the flue gas). It is difficult for the widely used denitrification catalysts to adapt to this kind of working conditions. , a catalyst with strong resistance to sulfur and water poisoning is necessary