催化作用
氧化还原
氮氧化物
化学
选择性
无机化学
选择性催化还原
硫酸
硫酸盐
还原(数学)
选择性还原
氨
多相催化
有机化学
燃烧
作者
Zhihua Lian,Wenpo Shan,Meng Wang,Hong He,Qi Feng
标识
DOI:10.1016/j.jes.2018.11.018
摘要
The effect of acidity and redox capability over sulfuric acid-modified CeO2 catalysts were studied for the selective catalytic reduction of NOx with NH3 (NH3-SCR). The deposition of sulfate significantly enhanced the catalytic performance over CeO2. NOx conversion over 4H2SO4/CeO2 at 230–440 °C was higher than 90%. The strong redox capability of CeO2 could result in unselective NH3 oxidation and decrease high temperatures catalytic activity and N2 selectivity. The deposition of sulfate increased the acidity and weakened the redox capability, and then increased the high temperature NOx conversion and N2 selectivity. An appropriate level of acidity also promoted the activity at 190–250 °C over ceria-based catalysts, and with further increase in the acidity, the SCR activity decreased slightly. Weak redox capability lowered the low-temperature catalytic activity. Excellent SCR activity requires a balance of acidity and redox capability on the catalysts.
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