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| 1 | 水汽-CO_2环境下Pt/CeZrO_2催化剂的CO氧化性能研究显示文摘采用浸渍法制备了Pt/Ce0.6Zr0.4O_2粉末催化剂,涂覆到蜂窝陶瓷载体表面得到整体式催化剂。考察了Pt含量及焙烧温度对催化剂在水汽-CO_2环境下催化CO氧化性能的影响,并用XRD,TEM和H2-TPR等手段对载体和催化剂进行了表征。结果表明,在空速50000 h-1的反应条件下,当焙烧温度为300℃时,3.0Pt/Ce0.6Zr0.4O_2整体式催化剂的CO氧化活性最高,反应温度200℃时,CO转化率为87%,具有较高的水汽-CO_2环境下的CO氧化活性。通过对2.0Pt/Ce0.6Zr0.4O_2催化剂在无水汽,无CO_2,无水汽-CO_2及水汽-CO_2环境下的对比实验,发现水汽和CO_2对催化剂的活性有明显的抑制作用,水汽的影响比CO_2的影响要更大一些。这说明水汽、CO_2和CO对催化剂存在竞争吸附。结合催化剂的H2-TPR表征结果,发现催化剂的还原能力越高,相对应的CO氧化活性也越高。添加适量的Pt有利于提高催化剂的还原能力,从而提高其活性,但是过量的Pt会使催化剂活性下降。 | 陈玲 金祝年 洪庆红 宋宇鹏 罗孟飞 | 2017 | 中国稀土学报2017，35，3： | 0 |
| 2 | Preparation and properties of Ce_(0.8)Ca_(0.2)O_(1.8) anode material by glycine-nitrate process显示文摘Ce0.8Ca0.2O1.8 (CDC82) anode material was prepared by glycine-nitrate process(GNP). Thermogravimetric(TG) analysis and differential scanning calorimetric(DSC) methods were adopted to characterize the reaction process of CDC82 material. X-ray diffractometry(XRD), scanning electron microcopy(SEM), direct current four probe (four-probe DC) and temperature process reduce(TPR) techniques were adopted to characterize the properties of CDC82 material. After the precursor was sintered at 750 ℃ for 4 h, CDC82 material with pure-fluorite structure and nanometer size was obtained. The total conductivity of CDC82 changes little with temperature in air at 50?850 ℃ , and the maximum value is 0.04 S/cm at 750 ℃ . The total conductivity wholly becomes larger when the atmosphere changes from air to hydrogen, which greatly increases with increasing temperature and reaches the maximum value of 1.09 S/cm at 850 ℃. Some impurities such as CeMg and La2O3 exist after the mixture of CDC82 anode and La1?xSrxGa1?yMgyO3?δ (LSGM) electrolyte material is sintered at 1 200 ℃ for 15 h. The CDC82 material as anode material has excellent catalytic property for hydrogen and methane. | 刘荣辉 马文会 王华 杨斌 戴永年 | 2007 | 中国有色金属学会会刊:英文版2007，17，4： | 0 |
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