柴油机选择性催化还原捕集技术(SDPF)的研究现状与发展趋势

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Abstract The limits of NO_x and PM of diesel engines are further reduced with the more stringent emission regulations. At present, the fundamental method of external purification to remove NO_x is selective catalytic reduction (SCR) technology, which usually has good NO_x conversion efficiency above 200℃. However, in the cold start phase of diesel engines, the exhaust gas temperature of SCR inlet can not reach 200℃, so it is difficult to control NO_x emission. Although the duration of the cold start is short, the NO_x emission in this phase accounts for a high proportion. Under strict emission regulations, the control of NO_x emission in the cold start phase has been paid more and more attention. Selective catalytic reduction filter (SDPF) technology can remove NO_x and PM simultaneously by coating SCR catalyst in the substrate of wall-flow diesel particulate filter (DPF). Compared with the SCR technology, SDPF is closer to the engine exhaust valve, and the temperature of catalytic reduction reaction of NO_x is effectively improved. Therefore, SDPF has become the key technology to enhance the low-temperature NO_x conversion efficiency. In this paper, the structure and principle, substrate and catalysts, performance and its influencing factors, and the technical route with SDPF were reviewed. In terms of the structure and principle of SDPF, the basic structure and chemical reaction principle of SDPF were introduced, and the main challenges faced by the technology were pointed out; in terms of SDPF substrate and catalyst, the common materials of the substrate, SCR catalyst coating, the design of substrate structure parameters and membrane technology to improve the performance of substrate were described, as well as the research progress of vanadium based and zeolite based SCR catalysts; in terms of SDPF performance and its influencing factors, the performance of soot oxidation, NOx reduction, urea mixing performance and durability of SDPF were analyzed, and the competitive reaction between soot oxidation and NO_x reduction needs to be optimized; in the aspect of the technical route of SDPF, the optimization of aftertreatment system with SDPF was introduced, and the double urea injection technology, low-temperature NO_x adsorption and thermal management technology coupling with SDPF can further broaden the temperature window of the aftertreatment system, which is the development trend of aftertreatment technology to meet the future ultra-low emission regulations.

Key words： diesel engines emission nitrogen oxides aftertreatment selective catalytic reduction filter technology

Received: 22 April 2021

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	TAN Pi-qiang
	DUAN Li-shuang
	LOU Di-ming
	HU Zhi-yuan

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TAN Pi-qiang,DUAN Li-shuang,LOU Di-ming等. Research status and development trend of selective catalytic reduction filter (SDPF) technology of diesel engines[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(12): 5495-5511.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I12/5495

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