Preparation method of high-mechanical-strength SCR denitration catalyst

Abstract

The invention provides a preparation method of a high-mechanical-strength SCR denitration catalyst. WO3 / TiO2-Al2O3 powder is adopted so that the whole framework of Al2O3 is kept, and the catalyst also has the good catalytic performance of TiO2, so that the mechanical strength is also improved under the condition that the good catalytic efficiency is guaranteed. On the other hand, a semidry-method pressing and molding process is adopted; in a pressing process, a relatively large gap is filled along the movement and deformation of the powder, and oxidized films on the surfaces of particles are crushed so that the contact area between the particles is enlarged and the attraction force is generated between atoms; the mechanical matching effect between the particles is enhanced so that a blank with certain density and strength is formed, and the mechanical strength and the production efficiency of the catalyst are greatly improved. An experiment result shows that the SCR denitration catalyst prepared by the preparation method has relatively high catalytic efficiency and mechanical strength and long service life.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a preparation method of a high mechanical strength SCR denitration catalyst. Background technique [0002] At present, my country's total nitrogen oxide emissions have reached 18 million tons. If no effective measures are taken, China's nitrogen oxide emissions will continue to increase in the next fifteen years, and may reach more than 30 million tons by 2020. my country is a large coal-fired country, and coal-fired power plants are the primary source of nitrogen oxide emissions, accounting for about 40% of the total, and have become the first batch of control objects in the country. The method of using selective catalytic reduction (SCR) technology to remove nitrogen oxides in flue gas is the mainstream of denitrification technology in the world today, and the catalyst is the technical core of the SCR denitrification system, and the cost of the catalyst usually accounts for t...

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Problems solved by technology

V 2 o 5 / TiO 2 The SCR-based catalyst has the advantages of high denitrification efficiency, strong selectivity, moderate reaction temperature, strong anti-poisoning ability, stable and reliable operation, etc., but it uses nano-sized TiO 2 As a catalyst carrier, it is expensive under the condition of high performance. At the same time, it adopts coating or extrusion processing technology, which makes the mechanical properties of the catalyst not stable enough, and has the disadvantages of large amount of catalyst, high cost and short service life.

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