OICC Press Iranian Journal of Catalysis 2345-4865 6 5 2024 02 03 Catalytic oxidation of airborne toluene by using copper oxide supported on a modified natural diatomite EN Seyed Reza Azimi Pirsaraei Department of Occupational Health Engineering, Faculty of Medical Sciences, Tarbiat Modares University, P.O. Box: 14115-111, Tehran, Iran. Hasan Asilian Mahabadi Department of Occupational Health Engineering, Faculty of Medical Sciences, Tarbiat Modares University, P.O. Box: 14115-111, Tehran, Iran. Ahmad Jonidi Jafari Research Center for Environmental Health Technology, Iran University of Medical Sciences, P.O Box: 14665-354, Tehran, Iran. Journal Article 2024 02 03 The catalytic oxidation of toluene over copper oxide supported on natural diatomite was investigated. The catalyst was prepared by the wet impregnation method and characterized by using the Brunauer Emmett Teller (BET), field emission Scanning Electron Microscopy (FESEM), X-ray diffraction (XRD), X-ray fluorescence (XRF) and Temperature-programmed reduction (TPR) analysis. The highest catalytic performance for airborne toluene oxidation was obtained at 14 wt% Cu loading. The toluene conversion at 270°C and 380°C, were 50% and 90%, respectively. According to the results of GC/MS and formation the CO2 in effluent gas, no intermediates such as CO or other hydrocarbons were detected and the selectivity towards CO2 was almost 100%.