Cellular SCR (selective catalytic reduction) denitration composite oxide catalyst and preparation method thereof

Abstract

The invention relates to a cellular SCR (selective catalytic reduction) denitration composite oxide catalyst and a preparation method thereof. In the method, the composite oxide of tin, cerium and tungsten is taken as the active component of the catalyst, and the composite oxide of titanium and zirconium is taken as a carrier, a honeycomb ceramic is taken as a supporter, and the mass of the honeycomb ceramic supporter is taken as the basis, wherein the mass capacity of the composite oxide of titanium and zirconium is 3-20wt%, the mass capacity of the composite oxide of tin, cerium and tungsten is 5-18wt. The method comprises the following steps: dipping the pre-treated honeycomb ceramics into a titanium-zirconium sol or thickener, drying and roasting; and dipping the obtained product into the composite solution or thickener of the tin, cerium and tungsten, drying and roasting to prepare a Sn-Ce-W-Ox composite oxide active component coating. In the invention, the denitration effect of the catalyst at low and middle temperature is improved, the crushing resistance and heat stability of the catalyst can be enhanced, the cost of the catalyst is lowered, and the preparation process is simple; and the active component of the catalyst is low in toxicity and is environment-friendly, and is suitable for denitration of a flue at low and middle temperature in harsh temperature-changing environment.

Description

technical field [0001] The invention relates to a high-efficiency, non-toxic and cheap low-medium temperature honeycomb SCR denitrification composite oxide catalyst and a preparation method thereof, belonging to the fields of air pollution control technology and environmental protection catalytic materials. Background technique [0002] Nitrogen oxides (NO x ) pollution is becoming more and more severe, and flue gas denitrification has become a key issue to be solved urgently in the country's "Twelfth Five-Year Plan". my country's annual NO x The emission is as high as 22 million tons, surpassing the United States to become the world's largest emitter, and the annual loss caused by acid rain pollution exceeds 300 billion yuan. On January 27, 2010, the Ministry of Environmental Protection officially promulgated the "Technical Policy on Nitrogen Oxide Prevention and Control in Thermal Power Plants", requiring that large-scale power plants in Beijing, Tianjin, Hebei, the Yang...

AI Technical Summary

Problems solved by technology

The disadvantage is that the catalysts of patents 2 and 3 are expensive, mainly because the cocatalyst WO 3 and MoO 3 The amount of addition is large, and the raw material itself is expensive and toxic

Both patents (CN1401416) and (CN1457920) use cordierite honeycomb ceramics as the support body, and the catalytic system is CuO / γ-Al 2 o 3 , the disadvantage is that the catalyst is easy to pulverize and has poor wear resistance

(CN101804344) The patent uses carbon nanotubes as the carrier, manganese oxides as the catalytic active component, and the active temperature range is 150-250°C. The disadvantage is that the catalyst has poor wear resistance and low-temperature poisoning resistance.

(CN101296748) patent is based on honeycomb zeolite as the carrier, iron, cerium, tin, gallium as the catalytic active components, the disadvantage is that the low temperature poisoning resistance of the catalyst is relatively poor

(CN1792455) The patent uses honeycomb activated carbon as the carrier, one or more metal oxides of iron, manganese, and vanadium as the catalytic active component, and the active temperature range is 120-250 °C. The disadvantage is the crushing strength of the catalyst Poor anti-poisoning performance at low and low temperatures, and the vanadium raw material is poisonous

(CN101554581) The patent uses alumina and zirconia as carriers, silver and palladium noble metals as catalytic active components, and the active temperature range is 230-280 ° C. The disadvantage is that the catalyst is expensive and has poor low-temperature anti-poisoning performance

(CN101254464) The patent uses titanium-zirconium composite oxide as the carrier, manganese oxide as the catalytic active component, and oxides of vanadium, chromium, iron, copper, nickel, and cerium as promoters, and the active temperature range is 100 ~300, the disadvantage is that the low-temperature poisoning resistance of the catalyst is poor, and the vanadium raw material is poisonous

Images