Taking the vanadium and titanium based SCR catalysts applied in a coal-fired power plant as research objects

fresh catalyst and after 30 000hours' operation catalyst were structural characterized by several analysis

such as N2 adsorption-desorption

SEM

XRD

XRF

TGA

Fourier-transform infrared(FT-IR)spectroscopy and temperature programmed reduction(H2-TPR).Furthermore

combing with the SCR denitration simulation test

the effect of K

Na

Ca

As and other elements on activation of the catalyst was investigated to find out the reason for deactivation of the SCR denitration catalyst comprehensively.The results show that

decrease in catalyst activation was a combination action caused by multiple factors

among which the active component loss and being poisoned by alkali/alkaline earth metal and As were the major reasons.In all toxic components

As had the greatest effect on the catalyst's deactivation

then was Ca and Na.The increase of K also reduced the catalyst's activity to some extent

but with a limitation.