Synergistic poisoning of KCl and PbCl2 on commercial V2O5-MoO3/TiO2 catalysts for MSW incineration flue gas denitrification

Alkali and heavy metal chlorides cause the deactivation of selective catalytic reduction (SCR) catalysts during municipal solid waste incineration. In this study, the synergistic poisoning of KCl and PbCl2 on commercial V2O5-MoO3/TiO2 SCR catalysts was investigated. Compared with KCl, PbCl2 could combine with Mo components and protect V sites from poisoning. Besides, the chemical bonds between PbCl2 and V sites were weaker. Hence, the single poisoning of PbCl2 was weak to the denitrification of SCR catalyst. Whereas, under the co-poisoning of KCl and PbCl2, V-O-Cl structures were formed, which suppressed NH3 activation, thereby causing the deactivation of SCR catalyst.

Automated summary

This study found that single poisoning of PbCl2 is weak for SCR catalyst deactivation, while co-poisoning of KCl and PbCl2 suppresses NH3 activation and enhances SCR catalyst deactivation.