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首页> 外文期刊>Catalysis science & technology >Oxydehydrogenation of C2-C4 hydrocarbons over Fe-ZSM-5 zeolites with N2O as an oxidant
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Oxydehydrogenation of C2-C4 hydrocarbons over Fe-ZSM-5 zeolites with N2O as an oxidant

机译:用N2O作为氧化剂的Fe-ZSM-5沸石在Fe-ZSM-5沸石上的氧化氢化

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摘要

Fe-ZSM-5 zeolites with a Si/AI ratio equal to 25 and 50, comprising 0.4 wt% of Fe and calcined at different temperatures, were used for oxidative dehydrogenation (ODH) of C2-C4 hydrocarbons. The calcination temperature (873 or 1173 K) slightly influenced hydrocarbon conversion, while it distinctly affected the selectivity towards respective olefins. It stems from the modification of acidic centers present in Fe-ZSM-5 samples. Calcination at 1173 K resulted in the decrease of total acidity, especially of strong Bronsted sites. UV-vis spectra evidenced the presence of very different iron(III) species, while the existence of Fe(II) ions was inferred from IR spectra of the adsorbed NO molecule. IR bands located at about 1840 and 1750 cm~(-1) indicate the presence of isolated iron(II) species, particularly in Fe-ZSM-5(1173) samples.
机译:Si/Ai比等于25和50的Fe-ZSM-5沸石,占Fe的0.4 wt%并在不同温度下钙化,用于C2-C4烃的氧化脱氢(ODH)。 钙化温度(873或1173 K)略微影响碳氢化合物的转化率,而它明显影响了对各自烯烃的选择性。 它源于Fe-ZSM-5样品中存在的酸性中心的修饰。 1173 K处的钙化导致总酸度降低,尤其是强bronsted位点。 UV-VIS光谱证明存在非常不同的铁(III)物种,而Fe(II)离子的存在是从吸附的无分子的IR光谱中推断出来的。 IR带约为1840和1750 cm〜(-1)表明存在分离的铁(II)物种,特别是在Fe-ZSM-5(1173)样品中。

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