Catalyst for concurrently removing CO, CH, NOx and PM, and preparation method thereof

Abstract

The present invention relates to a catalyst for concurrently removing CO, CH, NOx and PM, and a preparation method thereof, and belongs to the field of an atmosphere pollution treatment technology and environment protection catalysis materials. According to the catalyst, a solid solution of rare earth and a rare metal zirconium, a perovskite-type composite oxide and a small amount of a noble metal are adopted as active components, a self-made honeycomb ceramic is adopted as a carrier, the total loading amount of the solid solution of the rare earth and the rare metal zirconium, and the perovskite-type composite oxide in the active components is 5-20% of the mass of the catalyst, the loading amount of the noble metal is 0.01-1% of the mass of the catalyst, a general formula of the active components is AgqE1-qAyZr1-yBCOx, E is a noble metal, A and B are rare earth, C is a transition metal, y is more than 0 and less than 1, q is more than 0 and less than 1, E is one or two selected from noble metals such as platinum (Pt), palladium (Pd) and rhodium (Rh), A and B are two selected from rare earth such as lanthanum (La), cerium (Ce), praseodymium (Pr) and neodymium (Nd), and C is one selected from transition metals such as copper (Cu), cobalt (Co), manganese (Mn), iron (Fe) and nickel (Ni).

Description

technical field [0001] The invention relates to a method for simultaneously removing carbon monoxide (CO), hydrocarbons (CH), nitrogen oxides (NO x ), a particulate matter (PM) catalyst and a preparation method thereof, belonging to the fields of air pollution control technology and environmental protection catalytic materials. Background technique [0002] With the rapid development of the national economy and the continuous improvement of people's living standards, my country's existing car ownership has exceeded the 100 million mark, and is still increasing at a rate of 10% per year. While improving production efficiency and providing convenient life, the tail gas emitted by automobiles has become the main source of air pollution in large and medium-sized cities in my country, including a large amount of carbon monoxide (CO), hydrocarbons (CH), nitrogen oxides (NO x ), sulfide, particulate matter (PM), formaldehyde, acrolein, etc., seriously threaten the growth of animal...

AI Technical Summary

Problems solved by technology

[0005] Patent CN1628904A discloses an automobile exhaust catalyst with high catalytic activity and good thermal stability in the presence of excess oxygen. Emissions of HC and CO

[0006] Patent CN1355066A discloses a method for preparing an automobile exhaust gas purification catalyst. The catalyst uses a cordierite honeycomb body as a carrier, the inner coating is composed of active alumina loaded rare earth and transition metal composite oxide, and the outer coating is composed of noble metals. Active component, the catalyst has a low light-off temperature and long service life, but the catalyst is a three-way catalyst of Pd, Pt or Rh, which is expensive, and the removal effect on PM needs to be further explored

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