Extrusion-type molecular-sieve denitration catalyst based on copper-iron mixing and preparation method of molecular-sieve denitration catalyst

Abstract

The invention discloses an extrusion-type molecular-sieve denitration catalyst based on copper-iron mixing and a preparation method of the molecular-sieve denitration catalyst. The preparation methodcomprises the following steps: (1) uniformly mixing a molecular sieve, talc, water-washed kaolin and calcined kaolin, then adding hydroxypropyl methyl cellulose, polyoxyethylene, stearic acid and glass fibers, and carrying out uniform mixing to obtain mixed powder; and (2) adding polyethylene glycol, lactic acid, a copper source, an iron source and deionized water into the mixed powder obtained inthe step (1), carrying out mixing, and sequentially carrying out kneading, aging, pugging, extruding, drying and calcining to obtain the extrusion-type molecular-sieve denitration catalyst based on copper-iron mixing. The preparation method provided by the invention has simple process and low production cost, and the prepared extrusion-type catalyst based on copper-iron mixing has the characteristics that the low-temperature activity and the high-temperature activity of the catalyst are improved simultaneously.

Description

technical field [0001] The invention belongs to the technical field of denitration catalyst preparation, in particular to an extruded copper-iron mixed-base molecular sieve denitration catalyst for automobile exhaust treatment and a preparation method thereof. Background technique [0002] Coal and petroleum are the main energy sources in my country, and a large amount of sulfur dioxide (SO2) will be produced when burning. 2 ), nitrogen oxides (NO x ) and harmful components such as dust. Among them, nitrogen oxides (NO x ) as one of the main pollutants, its emission is not only harmful to human health, but also causes serious environmental problems such as the ozone layer hole, acid rain, greenhouse effect and photochemical smog, so the effective control of NO x The emission of air pollution is an important air pollution problem that needs to be solved urgently in my country in the near future. [0003] In recent years, Selective Catalytic Reduction (SCR) is the removal ...

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Problems solved by technology

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

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