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A common feature of H2-assisted HC-SCR over Ag/Al2O3

机译:H2辅助HC-SCR在AG/AL2O3上的共同特征

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摘要

CH4, C2H2, C2H4, C3H6, and C3H8 were selected as reductants for selective catalytic reduction (SCR) of NO_x over Ag/Al2O3. Activity measurement showed that NO_x reduction by hydrocarbons containing two-or three-carbon atoms was clearly promoted by H2 over Ag/Al2O3 at low temperatures, while such enhancement did not occur in the case of CH4-SCR. Gas chromatography and gas chromatography coupled to a mass spectrometer analysis showed that the partial oxidation of hydrocarbons with more than one carbon atom was triggered at low temperatures by H2 addition over Ag/Al2O3. On the surface of Ag/Al2O3, in situ diffuse reflectance infrared Fourier transform spectra indicated that this enhancement mainly originated from the formation of reactive enolic species, which is a common feature of H2-assisted HC-SCR.
机译:选择CH4,C2H2,C2H4,C3H6和C3H8作为AG/AL2O3 NO_X的选择性催化还原(SCR)的还原剂。 活性测量表明,在低温下,H2在Ag/Al2O3上清楚地促进了含有两碳原子的碳氢化合物的NO_X降低,而在CH4-SCR的情况下则没有发生这种增强。 气相色谱和气相色谱与质谱仪分析结合,表明,在低温下,H2添加AG/AL2O3在低温下触发了具有多个碳原子的烃的部分氧化。 在Ag/Al2O3的表面上,原位弥漫性反射红外傅立叶变换光谱表明,这种增强主要起源于反应性enolical物种的形成,这是H2辅助HC-SCR的共同特征。

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