Metal carrier loaded copper-based SCR catalyst and preparation method thereof

Abstract

The invention belongs to the technical field of SCR denitration, and particularly relates to a metal carrier loaded copper-based SCR catalyst and a preparation method thereof. The metal carrier loaded copper-based SCR catalyst comprises a carrier and a coating; the carrier is a metal carrier; the coating is a copper-containing molecular sieve; the copper-containing molecular sieve further contains rare earth elements; and the content of the rare earth elements accounts for 0.1%-5% of the weight of the molecular sieve. The preparation process of the catalyst specifically comprises the steps of metal carrier pretreatment, molecular sieve slurry preparation, slurry applying and catalyst roasting. The Cu-SCR catalyst prepared through the method is uniform in coating distribution, the coating amount of the coating is high and can reach 160 g / L, the bonding firmness of the coating and the carrier is high, the coating falling rate is smaller than 1%, the production technological process is simple, large-scale continuous production is facilitated, and a bench test shows that the highest conversion rate of NOx at the temperature of 200-500 DEG C can reach 98.5%.

Description

technical field [0001] The invention belongs to the technical field of SCR denitrification, and in particular relates to a copper-based SCR (Cu-SCR) catalyst loaded on a metal carrier and a preparation method thereof. Background technique [0002] The combustion of fossil fuels produces large amounts of nitrogen oxides (NOx), of which about 95% are NO and 5% are NO 2 , will not only cause great harm to human health, but also have a serious impact and damage to the environment, such as photochemical smog, acid rain, and the hole in the ozone layer are all related to NOx. Therefore, the control and governance of NOx is imminent. [0003] At present, selective catalytic reduction (SCR) is a widely used technical route for NOx treatment. After years of development, SCR technology is widely used in the fields of diesel engines and industrial exhaust gas with a high proportion of NOx emissions. In recent years, with people's increasing emphasis on ecological and environmental pr...

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Problems solved by technology

[0007] The above preparation method has the following problems: (1) the combination of the molecular sieve coating and the metal carrier is low, and the coating shedding rate is high; (2) the pretreatment method of the metal carrier is complicated, the energy consumption is high, and the preparation of the molecular sieve slurry is complicated and has many components. , which increases the cost and reduces the proportion of molecular sieves in the coating, which affects the denitrification performance of the catalyst; (3) the coating is unevenly distributed, the coating amount is too small or the number of coatings is too many, which affects production efficiency and increases costs;

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