Mn - Ce/tio < Sub > 2 < / Sub > Catalyst At Low Temperature Selective Catalytic Reduction Of No Mechanism Research

At present, low temperature selective catalytic reduction technology has attracted more and more interests for its energy conservation and potential application. But the active of the catalyst was not enough in the low temperature range, sulfur dioxide resistance of catalyst was poor, the catalytic reaction and sulfur dioxide poisoning mechanism was uncertain, which are the main obstacle of industrial application. In order to solve these problems, this research systematically investigated the performance of the Mn-Ce/TiO2prepared by co-precipitation method.The catalysts of Mn-Ce/TiO2were prepared by co-precipitation, during which the components and support of the catalyst were precipitated in the mixture solution at the same time. Through the experiment systematically study the performance of the catalyst of Mn-Ce/TiO2, which effects of the Mn/Ce ratio, precursor, reaction temperature, space velocity and nitric oxide and ammonia density, NSR proportion on the catalytic active of catalyst. Also, the comprehensive properties of the catalyst were detected in this paper.Through to the catalyst reaction dynamics analysis, the catalyst reaction of various components of the reaction series and the reaction rate constant are confirmed. And also the apparent activation energy was calculated by the Arrhenius equation. The apparent activation is40kJ/mol. Through steady state kinetic experiment of the NO, NH3, O2, the various components in the role of the catalytic reaction and the rate of diffusion in the surface of the catalyst are confirmed. With the help of character technology of NH3-TPD and TG analysis methods, the catalyst reaction process, found the catalytic reaction mechanism of the Mn-Ce/TiO2is found. The catalyst of Mn-Ce/TiO2follows the E-R and L-H mechanisms.The sulfur dioxide poisoning of the catalyst was investigated. The characters of the catalyst before and after the reaction were detected by BET, SEM, XRD, XPS, NH3-TPD, H2-TPR, TG analysis. And research the effects of density of sulfur dioxide on the catalyst. Then the mechanism of the sulfur dioxide poisoning was concluded. The major factors include:the vitriol salt deposits, active component is sulfide, Lewis acid site disappear.