Citation: | ZHANG Xian-Long, Tun-Xue-Beng, Huang-Zhang-Gen, Liu-Zhen-Yu. Effect of potassium compounds on the catalytic activity of V2O5/AC for SCR of NO by NH3 at low temperatures: NH3 adsorption and oxidation[J]. Journal of Fuel Chemistry and Technology, 2009, 37(04): 496-500. |
K2O and K2SO4 are loaded on the catalyst V2O5(1%)/AC (V1/AC) by the method of wet immersing followed by drying. The effect of potassium compounds on the catalytic performance of V1/AC for the low temperature SCR of NO by NH3 was investigated. It was found that both K2O and K2SO4 as ultrafine particles loaded in V1/AC can cause the catalyst deactivation. The adsorption of NH3 on the catalyst, especially the portion of weakly adsorbed NH3, is inhibited remarkably by the loading of potassium compounds. The inhibition by K2SO4 is moderate, as compared with that by K2O; this is also in accordance with the extent of their effects on the catalytic activity. K2O brings on little change in the surface oxidizability of V1/AC, the catalyst deactivation by K2O is a result of the inhibition of NH3 adsorption. Comparatively, the loading of K2SO4 may enhance the possibility for the adsorbed NH3 being oxidized to NO by O2.