Open AccessSimultaneous removal of SO2 and NO from flue gas using CeO2 promoted CuO/γ-Al2O3 catalysts
Author(s) -
Qilong Zhang,
Yong Dong,
Lin Cui
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/508/1/012139
Subject(s) - catalysis , flue gas desulfurization , flue gas , chemistry , adsorption , selectivity , inorganic chemistry , lewis acids and bases , sulfate , space velocity , chemical engineering , nuclear chemistry , organic chemistry , engineering
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 SO 2 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 CuSO 4 and Ce 2 (SO 4 ) 2 formed on the surface of Cu8Ce3S have a lower denitration activity below 350°C than CuO and CeO 2 . However, Changes in catalyst pore structure after desulfurization could not affect the amount of NH 3 adsorbed significantly. The formation of SO 4 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 NH 3 to ensure that Cu8Ce3S has a faster reaction rate than that of Cu8Ce3 above 350°C. The catalytic selectivity of Cu8Ce3S for NH 3 is better than that of Cu8Ce3 at 350-500°C, which is the fundamental reason for the improvement of denitration efficiency at high temperatures.