Abstract:

Nitrogen oxide is one of the main air pollution sources,which is harmful to human health and causes acid rain. With the upgrading of environmental protection regulations,the limit of NO_x emission concentration is becoming lower and lower.It requires the denitration process,especially the denitration catalyst,to further improve the denitration performance. Using ZSM-5 molecular sieve as carrier,copper and cerium as active components,the active components of denitration cata-lyst were prepared.The active components of denitration catalyst were attached to honeycomb ceramics with aluminum glue to obtain denitration catalyst.Compared with ZSM-5 molecular sieve,the active component of denitration catalyst increased by 4.73% of Cu（calculated by the mass fraction of CuO） and 5.40% of Ce（calculated by the mass fraction of CeO₂）,and the spe-cific surface decreased from 287.04 m²/g to 275.05 m²/g,and the pore volume and the pore size remained unchanged,and the acidity increased,and the crystal form remained basically unchanged.The optimal reaction conditions of denitrification cata-lyst were that reaction time was more than or equal to 60 min,temperature was more than or equal to 250 ℃,and airspeed was less than or equal to 10 200 h^-1.The denitration efficiency of the catalyst was about 85% under the optimum reaction conditions.The catalyst could adapt to lower reaction temperature and had higher denitration efficiency.

Key words: denitration catalyst, ZSM-5 sieve, copper, cerium