o-TPP/ TiO2有O2条件下催化CO还原NOx研究

he reduction of NO by CO in the presence of oxygen in gas mixture and the dependence from reacting condition have been investigated on Co-TPP supported on nanometer titania catalysts. The results shown that this catalyst yielded 85% NO conversion at 100℃ when the volume fraction of feeding gas is NO 500 mg•m-3, CO 5000 mg•m-3, O2 4%, space velocity 10000 h-1. In addition, only SO2 has little effect on NO reduction. At the same time, the competed adsorption of H2O reduced the NO conversion slowly, but the catalyst can be recycled after H2O desorption. In the presence of both SO2 and H2O, the catalyst was poisoned slowly but can be recycled after vacuum heat treatment. Mechanism of the reduction was also investigated, NO2 is more easily to reduce than NO, both N2O and N2 were the products of NO reduction, and N2 occupied a higher proportion with increasing temperature. N2 is the dominant product of NO2 reduction. The Co-TPP /TiO2 catalyst can be used for NO reduction with CO in the absence of either SO2 or H2O.