Effects of Manganese substituted Lithium or Magnesium of SrMnO3 perovskite on Light off Temperature of CO and Hydrocarbon Oxidation

سال انتشار: 1388
محل انتشار: ششمین کنگره بین المللی مهندسی شیمی
کد COI اختصاصی: ICHEC06_075
زبان مقاله: انگلیسی
تعداد مشاهده: 1580

نویسندگان

School of Chemistry, Damghan University of Basic Sciences (DUBS), Damghan, I. R. Iran.

Catalysis and Nanostructured Materials Laboratory, School of Chemical Engineering, University of Tehran, Tehran, I. R. Iran.

Yadollah Mortazavi

Catalysis and Nanostructured Materials Laboratory, School of Chemical Engineering, University of Tehran, Tehran, I. R. Iran.

چکیده

Catalysts with the formula of SrAxMn(1-x)O(3-δ), where x is 0.0, 0.1, 0.2, 0.3, and A is Li or Mg were studied for CO and C2H6 oxidation in a synthetic exhaust gas of gasoline engines. A 6.0%CO and 0.2%C2H6 in Ar mixed with stoichiometric amount of air was used as the synthetic exhaust gas, emitted by internal combustion engines. Ethane was selected as a model for unberned hydrocarbons in the exhaust gas. The catalysts were prepared by combustion–like method and calcined at 850 and 1000oC for 5 h, respectively. SrMn(1-x)O(3-δ) perovskite structure is observed in XRD patterns of studied catalysts. Manganese oxide peaks of the reductions are observed in range of 305–750oC. The peak at> 750oC is observed in SrAxMn(1-x)O(3-δ) catalysts, which is absent in pure manganese oxide, is related to strontium oxide. XRD and TPR analysis are evidence for the formation of a nonstoicheometric SrMn< 1O3–δ perovskite. The rest of manganese oxide is observed to disperse on perovskite structure, affecting its properties.

کلیدواژه ها

Mixed oxides, Nonstoicheometric Perovskite, SrMnO3, Mn3O4, CO, Hydrocarbon, exhaust gas, catalyticconverter, Oxidation

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