实验结果表明,10%-Cu/SAPO-34催化剂在300 ℃温度下具有100%的 NH3去除率,且其氮气选择性大于90%.与此同时,通过XRD,BET,UV-vis,H2-TPR和XPS等表征分析结果表明,高度分散的CuO是Cu/SAPO-34催化剂的主要活性组分.对10%-Cu/SAPO-34催化剂进行水热处理后,催化剂低温活性明显提高,催化剂的N2选择性在325℃急剧...
(4)将上述催化剂的前驱体置于马弗炉中,于450℃及空气气氛下,焙烧3h,即得到用于柴油车尾气的低温nh3-sco催化剂。 实施例2制备得到的nh3-sco催化剂中,质量比co:beta=0.04,质量比cu:beta=0.1,催化剂粒径为40～60目(300～450μm),该催化剂的xrd图如图3所示,其sco活性测试结果见图1和图2,其中,活性测试条件:5...
制备Ag2Cu1/H-ZSM-5合金粉末催化剂,并将其应用于富氧条件下的低温NH3-SCO反应,以考察H-ZSM-5分子筛对Ag-Cu合金纳米颗粒催化活性的促进作用.结果表明,Ag2Cu1/H-ZSM-5催化剂表现出较佳的低温氨氧化性能,其T50和T90的数值分别为221,247℃.X射线衍射(XRD),N2物理吸附和扫描电子显微镜(SEM)的结果表明,Ag2Cu1...
投料比,改变反应温度,使用Ag—Cu双催化剂可以获得如图b的图象。①A点是否达到平衡?填“是”或“否”),理由是②计算500℃时,容器内的压强增加了③为同时提高NH3的平衡转化率和转化速率,可以采取以下措施(填标号)。A.采用高温、高压的反应条件B.加大 p(NH3):p(O2)C.及时将水分离出去D.减 15p(NH_3)=p(...
采用浸渍法制备了一系列不同铜含量的Cu/SAPO-34催化剂,考察了该系列催化剂上NH3选择性催化氧化反应性能(NH3-SCO).实验结果表明,10%-Cu/SAPO-34催化剂在300℃温度下具有100%的NH3去除率,且其氮气选择性大于90%.与此同时,通过XRD,BET,UV-vis,H2-TPR和XPS等表征分析结果表明,高度分散的CuO是Cu/SAPO-34催化剂...
The Cu/SSZ-13 catalyst can provide multiple active sites for the ammonia selective catalytic oxidation (NH3-SCO), the influence of which can be tuned by varying the Si/Al ratio. The latter parameter was found to influence the surface acidic property and the Cu species distribution, which are...
Selective catalytic oxidation (SCO)ammonia (NHNoble metalMolecular sieveCu–based catalystsReaction mechanismVarious NH3–SCO catalysts highly promising to reduce NH3 emission are summarized and classified considering of N2–selectivity (SN2) at T100% (starting temperature for complete NH3 conversion) in ...
A multiple-active-site Cu/SSZ-13 for NH3-SCO: Influence of Si/Al ratio on the catalytic performancedoi:10.1016/j.catcom.2019.105751Jingjing GuoWeinan YangYani ZhangLina GanChi FanJianjun ChenYue PengJunhua LiElsevier
The results indicated that the co-modification of Cu and Er imposed little influence on NH3 conversion efficiency, but significantly boosted N2 selectivity. Compared with other Cu-Er–modified V/PT catalysts, CEV/PT-4 catalyst exhibited outstanding NH3-SCO performance, which attained completely 100%...
NANOPARTICLESTypically, to meet emission regulations, the selective catalytic reduction of NOX with NH3 (NH3-SCR) technology cause NH3 emissions owing to high NH3/NOX ratios to meet emission regulations. In this study, V-Cu/BN-Ti was used to remove residual NOX and NH3. Ca...