Property influence and poisoning mechanism of HgCl2 on V2O5-WO3/TiO2 SCR-DeNOx catalysts

In this paper, HgCl2 was loaded by impregnation method to study its property influence and poisoning mechanism on V2O5-WO3/TiO2 SCR-DeNO(x) catalyst. For HgCl2-containing catalysts, deactivation was observed in simulated gas stream, and its catalytic activity declined with the increase of HgCl2 loadings. Bronsted acid sites (V-OH) and V=O bond were affected evidently by HgCl2, new NH3 adsorption site Cl-V-O-H was generated after HgCl2 addition. Interactions between HgCl2 and V2O5 resulted in the loss of SCR active sites, and -HgCl existed as the stable form on the bridge site. Finally, the probable schematic diagram of HgCl2 poisoning mechanism was also proposed. (C) 2016 Elsevier B.V. All rights reserved.