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首页> 外文期刊>Catalysis science & technology >Catalytic combustion of diesel soot over Fe and Ag-doped manganese oxides: role of heteroatoms in the catalytic performances
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Catalytic combustion of diesel soot over Fe and Ag-doped manganese oxides: role of heteroatoms in the catalytic performances

机译：催化燃烧的柴油在铁和烟尘Ag-doped锰氧化物:杂原子的作用催化性能

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摘要

Fe-Doped manganese oxide catalysts were prepared by the citrate method and their catalytic activities in soot combustion were examined in air under tight contact mode. Among the catalysts tested, 12 mol% of Fe-doped alpha-Mn2O3 exhibited the highest activity, giving a soot combustion temperature (T-50) of 328 degrees C, which is comparable to that previously reported for rare-earth-based catalysts, while pure alpha-Mn2O3 gave a T-50 value of 339 degrees C. Comprehensive analyses by means of X-ray diffraction (XRD), specific surface area measurement, oxygen release rate measurement, X-ray photoelectron spectroscopy (XPS) and X-ray absorption fine structure (XAFS) measurements revealed that the improved activity was due to i) an increased specific surface area and ii) an improved oxygen release rate involving reactive surface-adsorbed oxygen species. In situ XAFS measurements suggested that the interaction between Mn and Fe facilitated the activation of the Mn-O-Fe bond and increased the proportion of reactive oxygen species, thereby improving the redox properties of the catalysts. Furthermore, simultaneous doping of Ag and Fe into Mn2O3 was examined to further enhance the catalytic activity, which gave a drastically improved catalytic activity with T-50 = 290 degrees C. Based on temperature programmed reduction (TPR) and in situ XAFS measurements, the direct oxidation mechanism of soot by the activated lattice oxygen species via the redox of Ag-0/Ag2O species was proposed.
机译：Fe-Doped锰氧化物催化剂准备柠檬酸的方法及其催化在燃烧烟尘进行活动空气严密的联系方式。测试,12摩尔% Fe-doped alpha-Mn2O3展出最高的活动,燃烧烟尘328摄氏度的温度(t - 50)与之前报道的动力源催化剂,而纯粹alpha-Mn2O3了t - 50 339摄氏度的价值。综合分析通过x射线衍射(XRD)、比表面积测量、氧气释放率测量,x射线光电子能谱(XPS)和x射线吸收精细结构(XAFS)测量透露,改进后的活动是由于我)增加比表面积和ii)改进涉及反应的氧气释放率surface-adsorbed氧物种。测量表明,互动锰和铁的活化之间Mn-O-Fe债券和增加的比例活性氧,从而改善催化剂的氧化还原性能。同时掺杂Ag)和铁成Mn2O3检查,进一步提高催化活动,大大改善了催化活性与t - 50 = 290摄氏度。基于程序升温还原(TPR)和原位XAFS测量,直接烟尘的氧化机制激活通过氧化还原Ag-0 / Ag2O晶格氧物种提出了物种。

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