Simultaneous removal of SO2 and NO from flue gas using CeO2 promoted CuO/γ-Al2O3 catalysts. Issue 1 (May 2020)

• Record Type: Journal Article
• Authors: Zhang, Qi-Long; Dong, Yong; Cui, Lin
• Is Part Of: IOP conference series. Volume 508:Issue 1(2020)
• Publication Date: 2020-05
• Subjects: Earth sciences -- Periodicals; Environmental sciences -- Congresses; Environmental sciences -- Periodicals; 550.5
• DOI: 10.1088/1755-1315/508/1/012139
• Languages: English
• ISSNs: 1755-1307

Abstract

Abstract: The simultaneous desulfurization and denitration performance of the Cu8Ce3 and Cu8Ce3S catalysts were studied in a fixed-bed reactor. The test results show that the presence of SO2 has a poisoning effect on the denitration performance of Cu8Ce3 when the flue gas temperature is below 350°C, but this kind of toxic effect is reversible. The root cause is that the sulfate species such as CuSO4 and Ce2 (SO4 )2 formed on the surface of Cu8Ce3S have a lower denitration activity below 350°C than CuO and CeO2 . However, Changes in catalyst pore structure after desulfurization could not affect the amount of NH3 adsorbed significantly. The formation of SO4 2- on the Cu8Ce3S catalyst surface increased the number of Lewis acid sites on the catalyst surface, which improved the catalyst's strength ability to react with NH3 to ensure that Cu8Ce3S has a faster reaction rate than that of Cu8Ce3 above 350°C. The catalytic selectivity of Cu8Ce3S for NH3 is better than that of Cu8Ce3 at 350-500°C, which is the fundamental reason for the improvement of denitration efficiency at high temperatures.