Abstract
The selective catalytic reduction of NO by NH 3 over monolayer V 2O 5TiO 2 catalyst has been investigated by transient response technique and IR spectroscopy. Ammonia adsorption-desorption processes on the catalyst surface proceed with participation of both Brønsted and Lewis acid sites. Sharp ammonia desorption caused by vanadia oxidation was observed in the reaction of O 2 and NO + O 2 flows with ammonia treated catalyst. This phenomenon results in the increase of the reaction rate. The reasonable mechanism of oxygen effect on the reaction rate is proposed.
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