收稿日期: 2024-02-20
网络出版日期: 2024-04-08
基金资助
山东省重点研发计划项目(2022CXGC020311);云南省科技人才与平台计划项目(202305AD160018);云南省科技人才与平台计划项目(202305AF150109);云南省重大科技专项计划项目(202402AC080004)
Research on NH3-SCR performance and ammonia storage characteristics based on different Cu-CHA catalyst schemes
Received date: 2024-02-20
Online published: 2024-04-08
为研究选择性催化还原（SCR）催化剂涂层硅铝比（SAR）、负载量、载体目数及氨/氮氧化物的物质的量比（ANR）对瞬态NO x 转化率及氨存储特性的影响，采用离子交换法制备SAR为12、22的Cu-CHA涂层，结合140、160 g/L负载量，62、93个孔/cm2目数载体制备出4种涂覆式催化剂。通过NH3-TPD/H2-TPR表征材料发现，SAR为12的涂层具备更多活性Cu2+和更多酸性位点。采用固定床反应器和发动机台架分别研究SCR瞬态单点性能和工况排放。单点性能研究发现，各方案低温NO x 反应速率由高到低的顺序依次为12-160-93、12-160-62、12-140-62、22-160-62，12-160-93方案下180、200、250 ℃单点平均反应速率分别可达2.24×10-6、4.37×10-6、1.48×10-5 mol/s；低SAR、高负载量、高载体目数方案都会提升单点瞬态NO x 转化率，降低瞬态氨存储量，提升ANR可同时提升瞬态NO x 转化率和瞬态氨存储量。各方案下工况NO x 排放与低温单点性能一致，但是高负载方案增加了变化工况下NH3泄漏量，与单点NH3泄漏趋势相反。
关键词： Cu-CHA型分子筛; 选择催化还原; NO x 反应速率; 氨存储特性; 氨泄漏
赖慧龙 , 于飞 , 杨冬霞 , 马江丽 , 殷雪梅 , 常仕英 . 基于不同Cu-CHA催化剂方案的NH3-SCR性能及氨存储特性研究[J]. 无机盐工业, 2024 , 56(12) : 159 -166 . DOI: 10.19964/j.issn.1006-4990.2024-0089
To investigate the effects of coating silicon aluminum ratio（SAR），loading amount，cell density of substrate scheme，and ammonia/nitrogen oxide molar ratio（ANR） on transient NO x conversion efficiency and ammonia storage characteristics of SCR catalysts，Cu-CHA coatings with SAR=12 and 22 were prepared by ion exchange method.Four coating catalyst schemes were prepared by combining loading amounts of 140 g/L and 160 g/L，62 pores/cm2 and 93 pores/cm2 mesh size carriers.Through NH3-TPD/H2-TPR characterization of the material，it was found that the SAR=12 coating had more active Cu2+ and more acidic sites.The transient single point performance and operating condition emissions of SCR were studied using a fixed bed reactor and an engine bench，respectively.Single point performance studies showed that the low-temperature NO x reaction rates of each scheme were 12-160-93，12-160-62，12-140-62，22-160-62.Under the 12-160-93 scheme，the average single point reaction rates at 180 ℃，200 ℃，and 250 ℃ could reach 2.24 ×10-6 mol/s，4.37×10-6 mol/s and 1.48×10-5 mol/s，respectively.Low SAR，high load，and high cell density schemes could improve the transient NO x conversion rate at a single point，reduce the transient ammonia storage capacity.Improving ANR could simultaneously enhance transient NO x conversion rate and transient ammonia storage capacity.The NO x emissions under different operating conditions were consistent with the low-temperature single point performance，but the high load scheme enhanced the NH3 leakage under changing operating conditions，which was opposite to the trend of NH3 leakage at a single point performance.
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