Abstract
The purpose of this study is to investigate the poisoning effects of Phosphorus (P) and Zinc (Z) over commercial NH 3 -SCR V 2 O 5 -MoO 3 /TiO 2 with realistic concentrations, used in coal-fired power plant. The catalyst is poisoned by two different methods, incipient wetness impregnation, and solid diffusion method and then characterized by NH 3 -Temperature Programmed Desorption (NH3-TPD) and H 2 -Temperature Programmed Reduction (H 2 -TPR). The results show that P and Zn had poisoning effects over V 2 O 5 -MoO 3 /TiO 2 when poisoned by Incipient Wetness Impregnation method, but there are negligible poisoning effects when poisoned by solid diffusion. On the other hand, P has comparatively more poisoning effects as compared to Zn in both poisoning methods. NH 3 -TPD and H 2 -TPR tests indicate that the ammonia desorption curves for P and Zn poisoned catalysts using incipient wetness impregnation method are shifted towards lower ammonia desorption, while the vanadium V active component is reduced from V5+ to V4+ which has been observed to causes the deactivation of the catalyst.
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