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Monolithic Catalysts with Low Noble-Metal Content for Exhaust Purification of Small Gasoline Engines
A series of low noble-metal coment monolithic catalysts for exhaust purification of small gasoline engines was investigated, and it was found that the Pt/Rh-OSM/Al2O3 (where OSM was oxygen storage material) catalyst with Ce0.5Zr0.5-MnOx(3%MnOx) OSM held low light-off temperature for CO, HC, and NO; quite wide three-way window, and outstanding thermal stability. The catalyst could efficiently comrol exhaust emission of small gasoline engines. 相似文献
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文章以钛酸四丁酯为原料,采用超声波分散450℃焙烧物得到了纳米TiO2光催化剂,以苯为模拟气体,在静态反应装置中考察了该催化剂对气相苯的光催化降解性能。结果表明,采用超声波制备的TiO2光催化剂能显著提高对苯的光催化降解性能,超声波制备的TiO2上苯转化率是搅拌制备的TiO2的1.7倍。BET结果显示超声波制备的光催化剂比表面比搅拌制备的光催化剂高;XRD表征结果表明TiO2呈锐钛型;紫外-可见漫反射结果显示超声波制备的TiO2在可见区吸收增强。 相似文献
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Nickel catalysts supported on CeO2-ZrO2-CeO2,ZrO2-Al2O3 and Al2O3 were prepared and characterized by means of X-ray diffraction(XRD),BET areas,H2 temperature-programmed reduction(H2-TPR),and X-ray photoelectron spectroscopy(XPS).Through the test of catalytic partial oxidation of methane(CPOM),Ni/CeO2-ZrO2-Al2O3 displayed the highest activity,which resulted from its largest BET area and best NiO dispersion.Furthermore,Ni/CeO2-ZrO2-Al2O3 maintained a long-time stability in CPOM,which was attributed to its best coking resistance among all the prepared catalysts. 相似文献
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挡渣出钢法是提高钢水质量的一项有效措施,针对二炼钢转炉生产的实际情况,研制成功挡渣球车,用在出钢后期加入挡渣球。实用结果表明:该车设计合理,运行可靠,有利于改善钢水质量。 相似文献
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以载玻片为载体,用溶胶-凝胶法制备了含银量为1.0%的Ag—TiO2复合膜,并且考察了复合膜光催化脱色甲基橙溶液的催化性能。结果表明:复合膜焙烧温度为450℃时催化活性最好,TiO2呈锐钛型,Ag—TiO2复合膜光催化性能是TiO2膜的2.25倍;低pH值时复合膜催化活性较好,当甲基橙浓度≤10mg/L时,光催化脱色反应为准一级反应,而且可以用Langmuir—Hinshelwood方程描述。复合膜使用15小时催化活性没有降低。 相似文献
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C 和 Si 是电工硅钢中两个最重要的成分。研究了 C 和 Si 对热轧电工硅钢带材某些性能的复合影响。C 影响铁素体基体中碳化物的数量和分布。在热轧前,随着([Si]%—11.45[C]%)数值的增加,加热产生的奥氏体最大体积百分率将变得较低。从延性角度看,C 和 Si 都是脆性元素。当 Si 含量高于3.12%时,为了不使延性大大降低,C 的含量不得高于0.030%。 相似文献
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The research investigated the effect of doping two metals separately or together into Ce0.5Zr0.5O2 on the catalytic activity of MnOx/Ce0.5-xZr0.5-xM0.2xOy/Al2O3 (M=Y, Mn, Y and Mn) for catalytic combustion of benzene. The prepared catalysts were characterized by X-ray diffraction (XRD), surface area analysis, oxygen storage capacity (OSC), and H2-temperature programmed reduction (H2-TPR). Catalytic test was performed on a conventional fixed bed flow reactor. The characterization results revealed that Y and Mn ions entered into the ceria-zirconia mixed oxides framework, which improved the textural properties and greatly promoted the MnOx dispersion on the support surface. The complete conversion temperature of benzene on MnOx/Ce0.4Zr0.4Y0.1Mn0.1Oy/Al2O3 was 563 K, and the selectivity of carbon dioxides was 99%. This catalyst could be applied in a wide range of GHSV and wide concentration condition, showing great potential for application. 相似文献
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为了更方便地对保护元件和保护性装置的性能进行仿真测试,本文建立了一种新的振荡模型,包括纯振荡模型和振荡中故障模型,能够较好地模拟纯振荡和振荡中故障时电气量的变化情况。这一模型可用以检查各种微机线路保护,有广泛的实用性。 相似文献