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在正庚烷、曲拉通、正辛醇和水按一定比例组成的反相微乳体系中制备了六铝酸盐LaMAl11O19-δ(M=Ni、Cu、Co、Mn和Fe),并采用XRD对该催化剂的晶相进行分析,考察不同焙烧时间和引入不同金属离子对催化剂晶相结构和热稳定性的影响。结果表明,La作为镜面离子的六铝酸盐催化剂LaMAl11O19-δ的最佳焙烧条件是1050℃焙烧4h,Mn和Fe作为活性组分掺入的六铝酸盐具有较好的热稳定性。进一步考察催化剂LaMAl11O19-δ对二甲醚催化燃烧反应。结果表明,催化剂LaMAl11O19-δ产生了催化活性,使二甲醚起燃温度和完全燃烧转化温度均比没加催化剂时降低,起燃温度为170℃,430℃时有90%的燃烧转化率。研究还对反相微乳液的回收利用进行了初步探讨,在回收的反相微乳液中制备的催化剂依然有较好的热稳定性和催化活性。 相似文献
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在正庚烷、曲拉通、正辛醇和水按一定比例组成的反相微乳体系中制备了六铝酸盐LaMAl11
O19-δ(M=Ni、Cu、Co、Mn和Fe),并采用XRD对该催化剂的晶相进行分析,考察不同焙烧时间和引入不同金属离子对催化剂晶相结构和热稳定性的影响.结果表明,La作为镜面离子的六铝酸盐催化剂LaMAl11
O19-δ的最佳焙烧条件是1 050℃焙烧4 h,Mn和Fe作为活性组分掺入的六铝酸盐具有较好的热稳定性.进一步考察催化剂LaMAl11
O19-δ对二甲醚催化燃烧反应.结果表明,催化剂LaMAl11 O19-δ产生了催化活性,使二甲醚起燃温度和完全燃烧转化温度均比没加催化剂时降低,起燃温度为170℃,430℃时有90%的燃烧转化率.研究还对反相微乳液的回收利用进行了初步探讨,在回收的反相微乳液中制备的催化剂依然有较好的热稳定性和催化活性. 相似文献
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制备方法对BaNi0.2Mn0.8Al11O19-δ催化燃烧二甲醚的催化活性的影响 总被引:1,自引:0,他引:1
Catalytic combustion of dimethyl ether (DME) over hexaaluminate catalyst BaNi0.2Mn0.8Al11O19-δ has been investigated. The catalysts were prepared with the sol-gel method and reverse microemulsion method respectively and characterized by thermogravimetry-differential thermal analysis, X-ray diffraction and transimission electron microscope. It was found that the formation of Mn, Ni modified hexaaluminate was a relatively slow process via two solid state reactions and spinel structure was a transition phase. At the same calcined temperature and time, the catalyst prepared with the reverse microemulsion method could form the hexaaluminate phase more easily than that prepared with the sol-gel method. The catalyst BaNi0.2Mn0.8Al11O19-δ prepared with the reverse micro-emulsion method appeared a plate-like morphology, while it appeared a needle-like morphology when using the sol-gel method. The catalytic activities of catalysts BaNi0.2Mn0.8Al11O19-δ prepared with two different methods for DME combustion were tested. It showed that catalyst prepared with the reverse microemulsion method had better catalytic activity, i. e. T10% of DME had decreased by 45℃, about 90% conversion of diemthyl ether at 380℃. 相似文献
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在硅橡胶电缆接头的长期使用中,受热老化影响内部出现水树区域,影响使用性能.而目前对硅橡胶电缆接头材料的老化性能恢复中,使用修复清洗液来对材料进行外部修复清洗,但外部修复清洗对内部水树区域的修复效果有限,修复效果不佳.因此,提出在不同状态下10kV硅橡胶电缆接头材料的老化与性能恢复.针对硅橡胶接头材料在不同状态下的老化原... 相似文献