Preparation and characterization of nano- and non-nanoscale CO3O4 spinels obtained from different methods and study of their performance in combustion of aromatics from polluted air-A comparison with Pt/γ-Al_2O_3 performance

摘要

This article reports the development of oxidative precipitation (OP) method for synthesis of CO_3O_4 as an environmental catalyst and comparison of its performance with that of obtained from conventional sol gel combustion (SG) method and industrial Pt/γ-Al_2O_3 in remediation of toluene from air. Catalytic studies were carried out in a fixed bed reactor at 1OO-35O℃ under atmospheric pressure. CO_3O_4 (OP) showed the highest activity in combustion of toluene. The half conversion temperature of toluene (T_(50)%) was 160,258, and 229℃ on CO_3O_4 (OP), CO_3O_4 (SG) and Pt/γ-Al_2O_3, respectively. The higher activity of CO_3O_4 (OP) was ascribed to nanostructure and reducibility of catalytic sites at lower temperatures, approved by TPR results. The study confirmed that preparation method has a large influence on the chemical-physical properties and activity of the catalyst. The study indicated that oxidative precipitation method could be a promising method to synthesize environmental catalysts considering the simplicity and needless to calcine catalyst at higher temperatures.