2016
DOI: 10.1021/acscatal.6b02496
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Formation and Effect of NH4+ Intermediates in NH3–SCR over Fe-ZSM-5 Zeolite Catalysts

Abstract: With the help of a technique combining in situ electrical impedance spectroscopy and DRIFT spectroscopy, we observed directly the formation of ammonium ion (NH 4 + ) intermediates resulting from the interaction of NO and NH 3 on Fe-ZSM-5 catalysts for selective catalytic reduction by NH 3 (NH 3 −SCR). The formed NH 4 + intermediates, indicating the activation of NO in the presence of adsorbed NH 3 , were found to be strongly related to the NH 3 −SCR activity of Fe-ZSM-5 catalysts at low temperatures. These fin… Show more

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Cited by 75 publications
(70 citation statements)
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References 36 publications
(91 reference statements)
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“…Fe-based zeolite have been extensively studied in the NH 3 -SCR reaction over the past decades. [6][7][8][9] However, the low-temperatures catalytic activity of Fe-based catalysts is still to be improved. 10,11 Moreover, the hydrothermal stability of this kind of catalysts needs to be improved.…”
Section: Introductionmentioning
confidence: 99%
“…Fe-based zeolite have been extensively studied in the NH 3 -SCR reaction over the past decades. [6][7][8][9] However, the low-temperatures catalytic activity of Fe-based catalysts is still to be improved. 10,11 Moreover, the hydrothermal stability of this kind of catalysts needs to be improved.…”
Section: Introductionmentioning
confidence: 99%
“…Nevertheless, more elementary processes associated with the NH 3 storage and conversion, in particular, the proton transport, are not fully understood. It is known that proton transport, which can take place either from the bridging hydroxyl groups (Brønsted acid sites) to reactant molecules or between the reaction intermediates, plays an important role in a series of catalytic reactions such as methylation [14], cracking and methanol-to-olefin [15,16], as well as abatement of NO x emissions [3,4,17]. Comprehensive experimental and theoretical investigations had been performed over zeolites with different framework types (FAU, BEA, MFI, FER, CHA, etc.…”
Section: Introductionmentioning
confidence: 99%
“…In the last years, we applied electrical impedance spectroscopy (IS) to study the proton transport in various zeolites (such as H-ZSM-5, Fe-ZSM-5, Cu-ZSM-5, Cu-SSZ-13, Cu-SAPO-34, etc.) as NH 3 -SCR catalysts under in situ or operando conditions [17,[25][26][27][28][29][30][31]. In NH 3 -SCR over zeolite catalysts, the adsorption of NH 3 molecules on Brønsted acid sites leads to the formation of ammonium ions (NH 4 + ), which interact further with NH 3 molecules forming NH 4 + ·(NH 3 ) n complexes at low temperatures [2].…”
Section: Introductionmentioning
confidence: 99%
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