Abstract
Selective catalytic reduction (SCR) of nitrogen oxides (NO<sub><italic>x</italic></sub>) under oxygen-rich conditions is a research hotspot in the field of environmental catalysis, of which the core problem is to develop environmental-friendly, highly effective and stable SCR catalyst systems. At present, the NH<sub>3</sub>-SCR technique using urea/NH<sub>3</sub> as reducing agent has already been widely applied for stationary flue gas denitrogenation and diesel engine exhaust purification. The HC-SCR technique using hydrogen carbons (HC) as reducing agent is also promising for practical application. For urea/NH<sub>3</sub>-SCR system, in this paper, the research progress of iron titanate catalyst, cerium-based oxide catalysts and small-pore zeolite catalysts is comprehensively summarized, including the catalyst structure, the SCR reaction mechanism, the improvement of low temperature activity and also the poisoning resistance performance. For HC-SCR system, herein, the SCR of NO<sub><italic>x</italic></sub> by higher HCs/diesel, and the achievements in the mechanism study of HC-SCR are summarized systematically, which can provide new guideline for the development and application of diesel-SCR technique.
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