催化作用
歧化
化学
无机化学
亚硝酸盐
氮氧化物
选择性催化还原
氧化物
氧化还原
布朗斯特德-洛瑞酸碱理论
氨
复合数
锰
相(物质)
材料科学
有机化学
硝酸盐
复合材料
燃烧
作者
Tahrizi Andana,Kenneth G. Rappé,Nicholas C. Nelson,Feng Gao,Yong Wang
标识
DOI:10.1016/j.apcatb.2022.121522
摘要
A composite catalyst comprised of ceria-manganese oxide and Cu-SSZ-13 components represents a potential solution for improving selective catalytic reduction (SCR) of NOx by ammonia. Here, clarity is provided to the pathway of promotion on these catalysts at low temperatures (< 200 °C), and it is shown that improved performance comes solely from interaction of the oxide phase with Brønsted acid bound NH3. We demonstrate that at low temperatures, the catalytic components interact via oxide-derived nitrites/nitrite-precursors (e.g., HONO, N2O3) reacting with Brønsted acid bound NH3 from the zeolite. Then, only at elevated temperatures is the influence of the oxide phase on Cu redox in the Cu-SSZ-13 observed. Furthermore, we show how the oxide component has the great potential to circumvent NH4NO3 inhibition on Cu-SSZ-13 in the composite catalysts at low temperatures by bypassing the formation of nitrates from NO2 disproportionation, thus providing a practical solution to improving low temperature SCR reactivity.
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