Zirconium-doped cerium-manganese oxide catalyst as well as preparation and application

Abstract

The invention discloses a zirconium-doped cerium-manganese oxide catalyst as well as preparation and application. The catalyst is a xZr-Ce-Mn ternary complex oxide obtained by a co-precipitation method, wherein x represents the percentage of zirconium in the total mole number of cerium-manganese, and is greater than or equal to 2.5 and less than or equal to 10. A preparation method comprises the following specific steps: dissolving a certain amount of manganese salt, cerium salt and zirconium salt into 200 ml of deionized water, dripping an ammonium carbonate aqueous solution with stirring at room temperature, continuously stirring for 1 to 3 hours, then filtering to obtain solids, transferring the solids into an oven for drying at 60 to 80 DEG C for 12 hours, and then roasting the solids in a muffle at 400 to 600 DEG C for 3 to 5 hours to obtain the zirconium-doped cerium-manganese oxide catalyst, wherein the mole ratio of cerium to manganese is 1 to 1. The catalyst is used for catalytic oxidation of nitric oxide, and the highest conversion ratio can reach 99 percent or above at 150 DEG C. Furthermore, the industrialized production of the zirconium-doped cerium-manganese oxide catalyst is easy to realize as the raw materials for preparing the catalyst are easily obtained, the process is simple and the cost is relatively low.

Description

technical field [0001] The invention relates to a zirconium-doped cerium-manganese oxide catalyst and its preparation, which is suitable for selective catalytic reduction of environmental pollutant nitric oxide and has application prospects in the field of environmental purification. Background technique [0002] Coal is one of the main energy sources in the world today. With social progress and economic development, the development and utilization of coal has seriously polluted the natural environment. More than 90% of NOx in air pollutants comes from the combustion of fuels such as coal, oil, and natural gas. Among them, 70% comes from the combustion of coal. For China, coal has always been the main primary energy source, and its dominant position in my country's primary energy composition will not change in a long period of time in the future. The power industry is also a large coal-burning household in my country. With the steady and rapid development of the economy, the ...

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Problems solved by technology

[0003] SCR technology is currently the best denitrification technology that can be used for stationary source NOx treatment. The denitrification rate can reach more than 90%. However, the commercial vanadium-based catalyst has a high operating temperature. In order to avoid repeated heating of the flue gas, the SCR reactor needs to be arranged. Before dust removal and desulfurization equipment, many problems have arisen, such as dust erosion, sulfur dioxide poisoning, alkali metal poisoning, etc., which seriously affect the service life of the catalyst, and the V in the vanadium-based catalyst 2 o 5 is a toxic substance

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