The Design of Sulfated Ce/HZSM-5 for Catalytic Decomposition of CF(4)

CF(4) has a global warming potential of 6500 and possesses a lifetime of 50,000 years. In this study, we modified the HZSM-5 catalyst with Ce and sulfuric acid treatment. The S/Ce/HZSM-5 catalyst achieves 41% of CF(4) conversion at 500 °C, which is four times higher than that over Ce/HZSM-5, while the HZSM-5 exhibits no catalytic activity. The effects of modification were studied by using NH(3)-TPD, FT-IR of pyridine adsorption, and XPS methods. The results indicated that the modification, especially the sulfuric acid treatment, strongly increased the Lewis acidic sites, strong acidic sites, and moderate acidic sites on catalysts, which are the main active centers for CF(4) decomposition. The mechanism of acidic sites increases by modification and CF(4) decomposition is clarified. The results of this work will help the development of more effective catalysts for CF(4) decomposition.