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Effects of Cu/Al Mass Ratio and Hydrothermal Aging Temperature on Catalytic Performance of Cu/SAPO-18 for the NH 3 -SCR of NO in Simulated Diesel Exhaust
Catalysis Surveys from Asia ( IF 3 ) Pub Date : 2019-07-20 , DOI: 10.1007/s10563-019-09283-3
Qi Gao , Qing Ye , Shuai Han , Shuiyuan Cheng , Tianfang Kang , Hongxing Dai

The Cu/SAPO-18 samples with different Cu/Al mass ratios were prepared, their catalytic activities for the NH3-SCR of NO in simulated diesel exhaust were evaluated, and effects of Cu/Al mass ratio and hydrothermal aging temperature on catalytic performance of Cu/SAPO-18 was examined. Physicochemical properties of the samples were characterized by means of various techniques. It is found that the activity of the sample changed with a rise in Cu/Al mass ratio, with the highest overall activity being achieved over the sample with a Cu/Al mass ratio of 0.045. The H2-TPR results indicate that the Cu/Al mass ratio could affect the distribution of Cu species, and the Cu/SAPO-18-0.045 sample possessed the highest amount of the isolated Cu2+ species. BET and XRD results reveal that the Cu/Al mass ratio exerted little effect on the structure of the sample. Low-temperature hydrothermal treatment had the least influence on the sample, and the effect of high-temperature hydrothermal treatment on the sample became increasingly obvious with a rise in hydrothermal treatment temperature. It is concluded that the hydrothermal aging treatment mainly affected the sample by destroying the structure, blocking the pores, migration and transformation of the Cu species, and changing the acidic sites of the sample.



中文翻译:

Cu / Al质量比和水热时效温度对Cu / SAPO-18对模拟柴油机排气中NH 3 -SCR NO催化性能的影响

制备了不同Cu / Al质量比的Cu / SAPO-18样品,评价了其对模拟柴油机尾气中NH 3 -SCR NO的催化活性,并研究了Cu / Al质量比和水热时效温度对催化性能的影响。检查了Cu / SAPO-18的量。通过各种技术对样品的理化性质进行表征。发现样品的活性随Cu / Al质量比的增加而变化,与Cu / Al质量比为0.045的样品相比,获得了最高的总活性。H 2 -TPR结果表明Cu / Al质量比可能影响Cu的分布,Cu / SAPO-18-0.045样品中Cu 2+的分离量最大。物种。BET和XRD结果表明,Cu / Al质量比对样品的结构影响很小。低温水热处理对样品的影响最小,并且随着水热处理温度的升高,高温水热处理对样品的影响变得越来越明显。结论是,水热时效处理主要通过破坏结构,阻塞孔,Cu物种的迁移和转变以及改变样品的酸性部位来影响样品。

更新日期:2020-04-20
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