| 摘要:针对柴油催化氧化系统（diesel oxidation catalyst，DOC）、颗粒捕集器（diesel particulate filter，DPF）、选择性催化还原（selective catalytic reduction，SCR）系统应用于轻型车时面临的催化剂布置困难和SCR催化剂温度低等问题，将SCR催化剂涂覆到DPF载体（简称SDPF），实现NOx减排和PM捕集功能，同时可显著减小后处理催化剂的体积。分别考察SDPF在200、300和400 ℃时不同碳烟加载量下的台架测试背压，测试结果表明SDPF催化剂加载碳烟在0~4.0 g/L范围内背压增长显著，在4.0~6.0 g/L范围内背压增长不明显。选取体积类似的SDPF和SCR催化剂进行新鲜态NOx转化性能对比测试，测试结果表明：SDPF催化剂仅需相同体积SCR催化剂约2/3的涂覆量即可达到相当的NOx转化能力，碳烟加载主要影响230 ℃以下的低温段NOx转化。SDPF载体积炭量达到6.0 g/L后进行快速升温，以测试催化剂的积炭再生性能。测试结果表明：SDPF积炭再生时高温区域集中在出气端中心区域，可探测最高温度低于650 ℃，较充分的碳烟再生时间应大于15 min。 |
| 关键词: 铜分子筛 颗粒捕集器 背压 NOx转化 主动再生 |
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| Experimental Investigation on a Cu-Zeolite Coated Diesel Particulate Filter |
| YUE Jun,GAO Yu′e,DONG Yazhou,JIN Weiyang,JIA Liwei |
| Wuxi Weifu Environmental Catalysts Co., Ltd., Wuxi 214018, China;Automotive Engineering Research Institute, Nanjing Automobile Group Co., Ltd., Nanjing 210006, China;FAW Jiefang Automobile Co., Ltd., Changchun 130000, China |
| Abstract:In response to the difficulties in catalyst layout and low temperature of SCR catalysts when using diesel oxidation catalyst（DOC），diesel particulate filter（DPF），and selective catalytic reduction（SCR）in light vehicles，SCR catalysts are coated on DPF carriers（SDPF）to achieve NOx reduction and PM capture functions，and it can also significantly reduce the volume of the post-treatment catalyst.The bench test backpressure of SDPF under different soot loading levels at 200，300 and 400 ℃ was investigated.The test results showed that the backpressure of SDPF catalyst loaded soot increased significantly in the range of 0~4.0 g/L，while the backpressure growth was not significant in the range of 4.0~6.0 g/L.Selecting SDPF and SCR catalysts with similar volumes for comparative testing of fresh NOx conversion performance，the test results show that SDPF catalysts only require about 2/3 of the same volume of SCR catalyst coating to achieve equivalent NOx conversion ability，and soot loading mainly affects NOx conversion in the low-temperature range below 230 ℃.After the carbon loading capacity of SDPF reaches 6.0 g/L，rapid heating was carried out to test the carbon deposition regeneration performance of the catalyst.The test results indicate that the high-temperature area during SDPF carbon regeneration is concentrated in the central area of the outlet end，and the maximum detectable temperature is below 650 ℃.A more sufficient carbon smoke regeneration time should be longer than 15 minutes.. |
| Key words: Cu-based zeolite diesel particulate filter back-pressure NOx conversion active regeneration |
