Honeycomb catalyst for denitration of glass furnace fume and preparation method thereof

Abstract

The invention discloses a honeycomb catalyst for SCR (Selective Catalytic Reduction) denitration of glass furnace fume, which comprises a carrier and active components. The honeycomb catalyst is characterized in that the carrier is a honeycomb titanium-silicon carrier which contains 30-50 wt% of TiO2-SiO2 powder, 10-20 wt% of TiO2 and 20-50 wt% of high-viscosity attapulgite; the active components comprise amorphous MnOx, V2O5 and WO3, wherein the amorphous MnOx accounts for 5-25.0% of the total weight of the catalyst, V2O5 accounts for 0.5-5.0% of the total weight of the catalyst, and WO3 accounts for 0.1-8.0% of the total weight of the catalyst. By adopting the high-viscosity attapulgite, the catalyst has high plasticity, strong binding power and strong water absorption; by selecting the TiO2-SiO2 powder, not only the apparent structures, such as the specific surface, the pore volume and the like, of the carrier can be improved, but also the conversion rate of SO2 to SO3 is inhibited. The selective reducing catalyst can be widely applied to selective reduction of nitrogen oxide in glass furnace fume.

Description

technical field [0001] The invention relates to a catalyst, in particular to a honeycomb catalyst used in selective catalytic reduction (SCR) denitrification of glass kiln flue gas and a preparation method thereof. Background technique [0002] According to statistics: In 2000, the national SO 2 Emissions are about 19.9 million tons, NO x The emission is about 11.7 million tons, and the area of ​​acid rain affects 40% of the country and nearly 4 million square kilometers. This has brought huge economic losses to the national economy, and also severely damaged the environment on which human beings rely for survival [because: ① nitrogen oxides seriously damage the atmospheric ozone layer, ② the affinity between nitrogen nitrides and red blood cells is 1000 times higher than that of carbon monoxide, ③ acid rain directly harms The growth of plants and crops, ④ nitrogen oxides will also affect the quality of groundwater.... With the expansion of comprehensive utilization of so...

AI Technical Summary

Problems solved by technology

②In recent years, domestic enterprises have introduced foreign technology, but the scale is small, and the production raw materials still need to be imported

③ The catalyst is expensive, about 50,000 yuan per cubic meter, accounting for about 40% of the entire denitrification project cost

④ The service life of the catalyst is short, and it needs to be replaced in about three years, and the cost of replacing the catalyst every year is also high

⑤ The production capacity of several foreign SCR catalyst production plants is only 100,000 cubic meters per year, which is far from meeting the needs of our country

... In summary, it is not difficult to see that the problems existing in the production and use of catalysts are one of the bottlenecks restricting flue gas denitrification projects

In the previous reducing catalysts, amorphous MnO was also used x , but this amorphous MnO x , it is afraid of water and sulfur, and its activity is poor at low temperature, and these reductive catalysts choose metatitanic acid as raw material, and carry V 2 o 5 After that, it is easy to make the SO in the flue gas 2 converted to SO 3 , which is an undesired result for any catalyst