催化作用
沸石
选择性催化还原
化学
无机化学
ZSM-5型
铵
吸附
反应中间体
光谱学
物理化学
有机化学
量子力学
物理
作者
Peirong Chen,Magdalena Jabłońska,Philipp Weide,Tobias Caumanns,Thomas E. Weirich,Martin Mühler,Ralf Moos,Regina Palkovits,Ulrich Simon
标识
DOI:10.1021/acscatal.6b02496
摘要
With the help of a technique combining in situ electrical impedance spectroscopy and DRIFT spectroscopy, we observed directly the formation of ammonium ion (NH4+) intermediates resulting from the interaction of NO and NH3 on Fe-ZSM-5 catalysts for selective catalytic reduction by NH3 (NH3–SCR). The formed NH4+ intermediates, indicating the activation of NO in the presence of adsorbed NH3, were found to be strongly related to the NH3–SCR activity of Fe-ZSM-5 catalysts at low temperatures. These findings, which are not easily achievable by conventional methods, provide new and important perspectives to understand mechanistically the NH3–SCR reaction over Fe-zeolite catalysts.
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