Honeycomb SCR denitration catalyst with high temperature of 550 DEG C and preparation method thereof

Abstract

The invention relates to a honeycomb SCR denitration catalyst with high temperature of 550 DEG C and a preparation method thereof. The catalyst comprises the following components in parts by weight: titanium dioxide, nano ZrO2, cordierite, metal silicon, ammonium metatungstate, rare earth elements, wood pulp cotton, an organic lubricant, hydroxypropyl methyl cellulose and glass fibers. According to the invention, a cooling or heating process adopted to adapt to the catalyst in the industry is avoided, the process flow is reduced, and the operation cost is greatly reduced. The honeycomb SCR denitration catalyst is particularly suitable for high-temperature tail gas denitration devices such as gas turbines and diesel engines, can be suitable for flue gas at 450-550 DEG C and has good chemical activity and stability, and the denitration performance under the high-temperature condition is greatly superior to that of a traditional SCR denitration catalyst. The honeycomb SCR denitration catalyst with high temperature of 550 DEG C also has the advantages of long service life and the like. The catalyst can be used for removing NOX in high-temperature tail gas denitration devices in sintered pellets, chemical and petrochemical industries and the like, and is wide in application range and significant in environmental protection significance.

Description

technical field [0001] The invention relates to a honeycomb SCR denitration catalyst with a high temperature of 550°C and a preparation method thereof. The invention has good heat exchange performance, denitration activity and a wide temperature window. Background technique [0002] Atmospheric nitrogen oxides (NO X ) is a common air pollutant, which can not only cause acid rain, photochemical smog, surface water eutrophication and other problems that damage the ecological environment, but also endanger human health. Therefore, it is currently the focus of atmospheric environmental protection. [0003] NO X As one of the main pollutants emitted by gas turbines, the combustion of gas turbines produces a large amount of NO during the start-up and stop phases. X , the content in the flue gas is as high as 2000mg / Nm3 or more, and the existence of NO2 causes the plume to be reddish brown or yellow, causing environmental pollution incidents. At present, there are two main metho...

AI Technical Summary

Problems solved by technology

[0004] At present, the use of domestic commercial denitrification catalysts with high temperature above 450°C is blank, and the traditional V 2 o 5 / MoO 3 (WO 3 ) / TiO 2 The catalyst uses vanadium base as the main active component. The relevant patents have a narrow activity temperature window (300-410°C) for tail gas denitrification treatment technology, poor high-temperature activity, poor thermal stability, and the catalyst is easy to sinter under high temperature conditions. chemically inactive

With modified ZSM-5 molecular sieve as the main catalyst, CeO 2 -ZrO 2 The solid solution is a co-catalyst. Although the prepared catalyst has high-temperature activity, the high-temperature structural stability of the ZSM-5 molecular sieve catalyst is poor. The amount of water vapor in the flue gas may cause the dealumination of the molecular sieve, resulting in the collapse of the molecular sieve.

Denitrification catalysts prepared with transition metal ions such as iron, manganese, and copper as active components have the disadvantages of serious sulfur poisoning and complicated preparation processes.

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