Selective catalytic NO_x reduction on Antimony promoted V_2O_5-Sb/TiO_2 catalyst

摘要

Quantum chemical calculation was carried out to choose a promoter which can reduce the poisoning of V_2O_5/TiO_2 catalysts by SO_2. Several atoms were chosen as candidates and new catalysts were synthesized by impregnation method. The NO_x conversion rate was measured at temperatures between 100 and 400°C and poisoning effect was investigated. The most promising candidate promoter, Se, was excluded because of its high vapor pressure. On the other hand, Sb shows best promoting properties. Sb promoted catalyst reaches the maximum NO_x conversion rate at 250°C. It also shows considerably enhanced resistance to poisoning of V_2O_5/TiO_2 catalysts by SO_2.