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| 1 | Preparation and desulfurization activity of nano-CeO_2/γ-Al_2O_3 catalysts显示文摘γ-Al_2 O_3-supported CeO_2 catalysts were prepared by microemulsion and impregnation methods and characterized by X-ray diffraction(XRD) and scanning electron microscope(SEM) techniques. At the same time,the desulfurization activity of catalysts was investigated.The results show that nanoscale active substances and a high desulfurization effect are achieved by microemulsion,exhibiting a significant dominance compared with traditional impregnation method. The optimal preparation condition is temperature of 30 ℃ and ratio of [H_2 O]/[surface active agent] of 7 with slow demulsification. The activated catalysts still keep high and stable desulfurization activity during a wide temperature range of 450-600 ℃.Among a series of prepared catalysts, the desulfurization rate of 6 CeO_2/γ-Al_2 O_3 is the highest, reaching up to 80 %when temperature is higher than 550 ℃. The catalytic reduction mechanism of SO_2 over nano-CeO_2/γ-Al_2 O_3 follows redox mechanism. | Qi Yang Hui Hu Shan-Shan Wang | 2018 | Rare Metals2018，37，7： | 4 |
| 2 | 焙烧温度对碳纳米管钴基费托合成催化剂性能的影响显示文摘通过浸渍法制备了不同焙烧温度的碳纳米管钴基费托合成催化剂[CAT(X),X=250、300、350、400、450、500],利用热重分析、氮气物理吸附-脱附、X射线衍射、氢气程序升温还原、扫描电镜、透射电镜和X射线光电子能谱等考察了焙烧温度对催化剂热稳定性、结构、物相、还原度及费托合成反应性能的影响。结果表明:载体碳纳米管在500℃以下可以稳定存在;焙烧温度在250-500℃时,催化剂的比表面积在79.78-85.23 m^2/g,孔容在0.60-0.68 m^3/g,孔径在28.9-33.4 nm。其中,经350℃焙烧的催化剂CAT(350)比表面积为79.78 m^2/g,孔容为0.67 m^3/g,孔径为33.4 nm;在350℃焙烧后,催化剂表面钴主要有Co3O4和Co O两种存在形式,晶粒细小,尺寸分布窄。程序升温还原测试和费托合成反应性能评价结果显示,350℃焙烧的催化剂CAT(350)还原温度最低,一氧化碳转化率最高,为12.5%。 | 李鹤 宋焕巧 罗明生 | 2018 | 精细化工2018，35，5： | 3 |
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