Extruded iron-based molecular sieve denitration catalyst for vehicle and preparation method thereof

Abstract

The invention provides an extruded iron-based molecular sieve denitration catalyst for a vehicle. The catalyst is synthesized from the following components: a molecular sieve, talcum powder, washed kaolin, calcined kaolin, hydroxypropyl methylcellulose, polyethylene glycol, lactic acid, stearic acid, glass fibers and an iron source. In terms of the amount of iron oxide, the addition amounts of thetalcum powder, washed kaolin, calcined kaolin, hydroxypropyl methylcellulose, polyethylene glycol, lactic acid, stearic acid, glass fibers and iron source respectively account for 7%-15%, 2%-6%, 6%-13%, 1%-5%, 4%-6%, 2%-5%, 2%-5%, 1%-5% and 1%-4% the weight of the molecular sieve. The denitration catalyst provided by the invention has significant advantages. Compared with a process for coating acordierite carrier with iron-based molecular sieve catalyst slurry, the extruded molecular sieve catalyst is simple to prepare, good in high-temperature activity, capable of overcoming the problems ofeasy hole blockage, a large falling rate and the like, beneficial for saving raw materials and reduced in production cost.

Description

technical field [0001] The invention relates to a catalyst, in particular to an extruded iron-based molecular sieve denitrification catalyst used for automobile tail gas treatment and a preparation method thereof. Background technique [0002] There are many types of pollutants emitted by automobile exhaust. Nitrogen oxides (NO x ) As one of the main pollutants, nitrogen oxides entering the atmosphere will bring great harm to humans and the environment, and human beings inhale nitrogen oxides will cause diseases such as emphysema and bronchitis. The emission of nitrogen oxides will also lead to serious environmental problems such as the hole in the ozone layer, acid rain, greenhouse effect and photochemical smog. If the NOx can be effectively controlled and eliminated x , can effectively prevent nitrogen oxide pollution. [0003] Selective catalytic reduction (Selective Catalytic Reduction, SCR) is the removal of NO x The most effective way to remove harmful gases. Cata...

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Problems solved by technology

However, the coated molecular sieve catalyst prepared by this method has problems such as low loading of active components, easy plugging, harsh preparation conditions, uneven coverage of molecular sieves on the surface of cordierite, insufficient bonding of molecular sieves and carriers, etc.