Method for preparing formed selective catalytic reduction denitration catalyst by using ultrasonic mixing sedimentation method

Abstract

The invention discloses a method for preparing a formed selective catalytic reduction (SCR) denitration catalyst by using an ultrasonic mixing sedimentation method, comprising the following steps of: preparing metatitanic acid as a dipping carrier by using the processes of uniform sedimentation and direct sedimentation sequentially and being assisted by an ultrasonic strengthened reaction process by taking industry titanyl sulfate as a raw material; then mixing with an ammonium metavanadate-ammonium tungstate-oxalate solution, a flocculating agent comprising polyacrylamide and glass fibre, a structure promoter, and the like, and stirring to finish the processes of active component dipping and loading and plastic pasty master batch preparation synchronously. The prepared master batch is processed by a vacuum-extruder after finely crushed to obtain a formed catalyst green body, and finally the preparation process of the formed SCR denitration catalyst is finished through drying and sintering operations. Compared with the traditional preparation process of the SCR denitration catalyst, the method has simple and clear process and high production efficiency, and the raw materials for preparing the carrier of the catalyst have wide sources and low cost, thereby lowering the production cost to a certain extent.

Description

technical field [0001] The invention relates to a preparation method of a shaped selective catalytic reduction denitrification catalyst, which belongs to the technical field of environmental pollution prevention and clean coal combustion. Background technique [0002] Coal is the main primary energy in our country. The NOx emitted by a large number of coal-fired power plants every year has brought great damage to the environment. Nitrogen oxides (NOx) are gases caused by acid rain and photochemical smog pollution. my country's NOx pollution is becoming more and more serious. The concentration of nitrogen oxides in the air of some large cities exceeds the standard. The environmental capacity of nitrogen oxides is basically in a saturated state, and photochemical smog even appears in some places. [0003] my country implemented the new "Emission Standards of Air Pollutants for Thermal Power Plants" (GB13223-2003) on January 1, 2004, and further strictly regulated NOx emissions...

AI Technical Summary

Problems solved by technology

This method is easy to operate, but there are the following problems: during the impregnation process, such as WO 3 and other co-catalyst components can only be loaded on TiO 2 The surface of the powder, the matrix and the impregnated components cannot be tightly combined in structure, which will affect the catalytic activity and thermal stability of the catalyst.

Moreover, the final shaped catalyst has low specific surface area and porosity, and poor mechanical strength, thus affecting the quality of the catalyst.

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