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Abstract
Simulated compounds were prepared by loading K2SO4 onto V2O5/AC catalysts. Study the effect of K2SO4 on V1/AC catalysts in the presence of low concentration SO2. Transient response techniques, TPD was carried out. The results indicated that the DeNO activity of V1/AC catalysts was decreased seriously in the early period of operation, but the deactivation was gradually diminished with SO2 adsorption and then, it was completely eliminated. For the sulphated catalysts (saturated catalysts by sulphate), their SCR activity were free from existence of gaseous SO2. the loss of activity about 10% caused by K2SO4 was found on them. The deactivation of K2SO4 deposited catalysts was due to the decrease of adsorbed and activated NH3, or some acid sites.
Highlights
Selective catalytic reduction of NOx (SCR) is one of the most widely used technologies for reducing NOx from stationary sources
The absence of O2 enhances the deactivation of catalyst by K2SO4
V2O5/activated carbon (AC) catalyst, but the deactivation caused by K2SO4 can be counteracted by SO2 adsorption
Summary
Selective catalytic reduction of NOx (SCR) is one of the most widely used technologies for reducing NOx from stationary sources. There are some submicron particles (though very little) which contain alkali and alkali earth metals in coal fired flue gas especially in some coal-biomass co-fired flue gases even after the electrostatic precipitator and desulphuriser [7,8,9] Those metals, mainly potassium, volatize from coal during combustion and condense to form. When the V2O5/AC catalyst is used for SCR downstream of desulfurizer, there is some low concentration of SO2 in flue gas. In this case, the possible deactivation of V2O5/AC by deposition of potassium compounds is an important factor to be considered for the performance of this catalyst.
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