Honeycomb integrated selective catalytic reduction (SCR) catalyst for nitric acid and nitrate tail gas denitration

Abstract

The invention discloses a honeycomb integrated selective catalytic reduction (SCR) catalyst for nitric acid and nitrate tail gas denitration. The SCR catalyst consists of a carrier in which meshed honeycomb holes are formed, an alumina active layer coated on the surfaces of the honeycomb holes, and active components impregnated on the alumina active layer, wherein the carrier consists of cordierite powder and auxiliary materials; the content of alumina in an activated oxide layer is not more than 20 weight percent; the active components comprise the following components of: 1 to 10 weight percent of V2O5, 1 to 10 weight percent of MoO3, 1 to 10 weight percent of WO3, 1 to 5 weight percent of MnO2, 1 to 5 weight percent of Cr2O3, 1 to 5 weight percent of CuO, 1 to 5 weight percent of Fe2O3 and the balance of aids. The SCR catalyst is prepared by the following steps of: preparing the carrier; coating the carrier by using alumina slurry; and impregnating the carrier in the active components, drying and firing to obtain the catalyst. The SCR catalyst is suitable to remove NOx at different concentrations from tail gas, suitable for the process of removing the NOx from the tail gas at different temperatures, has a wide temperature range of between 160 and 420 DEG C, and is high in denitration efficiency, wide in application range and long in service life and easy to prepare, and secondary pollution can be avoided.

Description

technical field [0001] The invention relates to a catalyst, in particular to a honeycomb monolithic SCR catalyst used for denitrification of nitric acid and nitrate tail gas and a preparation method thereof. Background technique [0002] With the development of my country's industry, the problem of nitrogen oxide pollution is very prominent, and the total amount of nitrogen oxide emissions remains high, which has become an important source of a series of environmental problems such as atmospheric acid deposition, ozone, and haze in our country. NOx not only damages the environment, but also directly endangers human health. Nitric acid and nitrate factories are one of the main emission sources of industrial nitrogen oxides. my country's nitric acid industry is developing rapidly, with large output and many manufacturers. The production capacity of a single set is relatively small and the production level is not high. At present, there are still many manufacturers of nitric ac...

AI Technical Summary

Problems solved by technology

The SCR process meets the requirements of economy, environmental protection, energy saving and emission reduction. The SCR method has become a relatively mature mainstream technology for denitrification at home and abroad. Will become a new growth point of environmental protection economy

[0004] The tail gas treatment technology in the nitric acid industry is relatively mature. Various methods such as absorption method, adsorption method and reduction method can meet the emission reduction requirements, but the SCR method is the most economical and effective One of the treatment methods, there are mature application examples in China such as Lutianhua and Heihua Group fertilizer factories, etc., but the SCR catalyst has a narrow use temperature, low activity, and is easy to deactivate