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以堇青石蜂窝陶瓷为载体,以过渡金属Mn(NO3)2和稀土金属Ce(NO3)2·6H2O盐为原料,采用柠檬酸浸渍法制备负载型MnCeOx混合氧化物催化剂,考察Mn与Ce的摩尔比、焙烧温度与时间以及柠檬酸用量对催化燃烧苯性能的影响,应用正交实验设计方案优化最佳制备工艺参数,并采用X射线衍射仪(XRD)、H2-TPR和扫描电镜(SEM)对催化剂进行表征与分析。实验结果表明n(Mn)∶n(Ce)=19∶21,焙烧时间为7h,n(Mn+)∶n(柠檬酸)=6∶1的催化剂表现出最佳的催化活性,在300℃及体积空速为20000h-1条件下,催化燃烧浓度为1.5×10-3的苯,催化转化率可达99.1%。 相似文献
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The promotional effect of the interaction between titania and ceria on the catalytic performance for selective reduction of NO was studied.The catalysts,CeO 2,TiO 2,CeO 2 /TiO 2 and Ti x Ce 1-x O 2,were synthesized and tested in NH 3-Selective catalytic reduction(SCR) of NO,and the samples were characterized by the Brunaller,Emmett and Teller(BET absorbed gas N 2),X-ray diffraction(XRD),high resolution transmission electron microscopy(HR-TEM),and temperature programmed desorption(TPD NH 3) techniques.The improvement mechanism of the interaction between the titania and ceria had been explored and discussed from two aspects of micro-structure and surface acidity.The interaction between the titania and ceria greatly improved the catalytic activity but had little effect on the active temperature.It was first reported that the acid amount determined the catalytic activity and the acid strength determined the active temperature for NH 3-SCR of NO. 相似文献
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微生物燃料电池产电的影响因素 总被引:10,自引:1,他引:10
以输出功率和内阻为评价指标,考察了直接微生物燃料电池在间歇运行过程中pH值、底物浓度、电极间距和添加电解质对产电性能的影响. 结果表明,pH值对输出功率影响较大,最佳值为7.5;输出功率随底物浓度的增大而增大.减小电极间距能有效降低电池内阻,提高输出功率,当电极间距为2 cm时,最大功率密度为700 mW/m2,内阻为80 W,库仑效率为7.7%. 磷酸盐缓冲溶液作为电解质对功率提高的效果优于NaCl,其添加量为100 mmol/L时,最大功率密度达922 mW/m2,内阻为70 W,库仑效率为11.5%. 相似文献
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用有机先驱体浸渍法制备了CeO2和Er2O3等稀土掺杂的Al2TiO5–TiO2–SiO2多相泡沫陶瓷。研究了CeO2和Er2O3等稀土掺杂对Al2TiO5–TiO2–SiO2多相泡沫陶瓷力学性能的影响。结果表明:CeO2和Er2O3掺杂可以显著增强Al2TiO5–TiO2–SiO2多相泡沫陶瓷的抗弯强度,在1250℃,以质量分数为0.5?O2 0.5%Er2O3掺杂,陶瓷样品的抗弯强度最佳,达到177.4MPa;在50~1000℃,热膨胀系数为5.2×10–6/℃,显气孔率超过76%。 相似文献