CAJ | 학술논문

利用水热合成技术将Cu-SAPO-34分子筛直接合成到蜂窝状堇青石上，研究模拟柴油机车尾气中选择性催化还原NO x的能力。采用SEM、XRD、ICP和XPS表征整体式催化剂的形貌、结构、Cu含量和价态变化。结果表明：原位制备技术制备的Cu-SAPO-34/堇青石整体催化剂中的活性金属Cu具有很高的选择性催化还原NO x的活性，Cu的最佳上载量质量分数为0.30%~0.40%。在12000 h-1的体积空速下，在400~670°C之间，可将大部分的NO x催化还原成N 2；在36000 h-1的空速下，在300~620°C之间，还能将60%的NO x转化成N 2。水热老化后的催化剂较好的保持催化活性，表明催化剂具有较好的水热稳定性。
이용수열합성기술장Cu-SAPO-34분자사직접합성도봉와상근청석상，연구모의시유궤차미기중선택성최화환원NO x적능력。채용SEM、XRD、ICP화XPS표정정체식최화제적형모、결구、Cu함량화개태변화。결과표명：원위제비기술제비적Cu-SAPO-34/근청석정체최화제중적활성금속Cu구유흔고적선택성최화환원NO x적활성，Cu적최가상재량질량분수위0.30%~0.40%。재12000 h-1적체적공속하，재400~670°C지간，가장대부분적NO x최화환원성N 2；재36000 h-1적공속하，재300~620°C지간，환능장60%적NO x전화성N 2。수열노화후적최화제교호적보지최화활성，표명최화제구유교호적수열은정성。
Cu-SAPO-34/cordierite catalysts were prepared via one-step hydrothermal synthesis method and their performances to remove NO x from the diesel vehicle exhaust were evaluated. The morphology, structure, Cu content and valence state were characterized by SEM, XRD, ICP and XPS, respectively. The experimental results show the active component Cu of the catalysts via in situ synthesis could significantly improve the selective catalytic reduction (SCR) activities of NOx and the optimal Cu content is in the range of 0.30%-0.40%(mass fraction). No N 2 O is detected by gas chromatograph (GC) during the evaluation process, which implies that NOx is almost entirely converted to N2 over Cu-SAPO-34/cordierite catalyst. The conversion rate of NOx to N2 by NH3 over catalyst could almost be up to 100%in the temperature range of 300-670 °C with a space velocity of 12000 h-1 and it is still more than 60% at 300-620 °C under 36000 h-1. The catalysts also show the good hydrothermal and chemical stability at the atmosphere with H 2 O.