Low-temperature SCR catalyst prepared by extrusion molding, and preparation method thereof

Abstract

The invention relates to a low-temperature SCR catalyst prepared by extrusion molding, and a preparation method thereof. The invention belongs to the field of atmosphere pollution controlling. According to the invention, an extrusion molding method is adopted for preparing the catalyst, and the technology is skillfully designed. The activity, sulfur dioxide resistance and water intoxication resistance of the prepared catalyst satisfy application requirements. The activity, the sulfur dioxide resistance and the water intoxication resistance of the catalyst are maintained, and a certain mechanical strength is ensured in the catalyst particles.

Description

technical field [0001] The invention belongs to the field of air pollution control, and mainly relates to the treatment technology of low-temperature flue gas nitrogen oxides of coal-fired boilers, in particular to an extruded low-temperature SCR catalyst and a preparation method thereof. Background technique [0002] With the continuous growth of energy consumption, stationary sources, mainly coal-fired boilers, emit more and more nitrogen oxides into the atmosphere. Nitrogen oxides (NOx) are the main pollutants that cause air pollution problems such as acid rain, photochemical smog, and increased near-surface ozone concentration. Therefore, NOx emission reduction technology has always been the focus of attention of various countries. With the promulgation of the "Emission Standard of Air Pollutants for Thermal Power Plants GB13223-2011", controlling NOx emissions from coal-fired power plants has become the focus of power environmental protection during the "Twelfth Five-Ye...

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Problems solved by technology

The catalyst used is mainly V 2 o 5 / TiO 2 series, it has very high catalytic activity, but it mainly has the following disadvantages in domestic applications: First, the reaction temperature is relatively high, and the general operating temperature is about 350 ° C. In order to meet the temperature requirements, the catalytic bed is generally arranged in the dust collector before, but on the one hand this arrangement will cause the SO of the catalyst 2 and alkali metal poisoning, as well as dust blockage, on the other hand requires a large space behind the furnace; second, the vanadium in the active component is poisonous, which is harmful to the ecological environment and human health; third, the cost of engineering technology and catalysts is very high

However, the technology of low-temperature SCR catalysts is relatively immature in the research and development at home and abroad.

In particular, most of the existing catalyst preparation methods are in the form of powders, which must be processed before they can be used in industrial applications. Some studies have proposed the use of cordierite, attapulgite, etc. to load active components. The adhesion on the carrier needs to be strengthened, and the carrier itself will still have an impact on the catalyst activity and the ability to resist sulfur dioxide and water vapor

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