(509d) Study Of Potassium Dititanate Catalyst For Treating Soot From Diesel Engine Exhausts

The particulate matters emitted from diesel engine can penetrate into the lung and cause severe bronchial trouble, so they can classified as carcinogen. The most promising technique of PM reduction is diesel particulate filter trap (DPF), for which system the development of effective and economical catalyst is a critical issue. In this paper, we suggest the catalytic properties of potassium dititanate for the soot oxidation. Until now, it is known that potassium dititanate are one of the most interesting compounds for the specific photochemical property. So its applications only to photoluminescence and photovoltaic activities for H2 evolution are emphasized. However, we found that K2Ti2O5 structure exhibits high activity of carbon oxidation. Here we investigated the soot oxidation activity of K2Ti2O5 at low temperature (<350°C), including the effects of soot-catalyst contact type, water promotion and SO2 poisoning. Unlike other catalysts that exhibit a strong sulfur poisoning effect, K2Ti2O5 keeps a remarkable activity even in the presence of SO2. In addition, we also examined the activities of different metals (Co, Ce, Fe etc) doped K2Ti2O5 catalysts and ion exchanged K2Ti2O5 catalyst and NO oxidation in this system was also considered. Finally the structure of K2Ti2O5 was characterized by XRD and FE-TEM. Considering its high activity, high thermal stability and low price (precious metal free); K2Ti2O5 is a potential catalyst for commercial application in DPF system.