Structural characterization of iron species in Fe-ZSM-5 catalysts and the elucidation of their role in the mechanism of NOx reactions

Roxana Pérez Vélez

doi:10.18453/rosdok_id00001491

Roxana Pérez Vélez

Structural characterization of iron species in Fe-ZSM-5 catalysts and the elucidation of their role in the mechanism of NOx reactions

Universität Rostock, 2015

https://doi.org/10.18453/rosdok_id00001491

Abstract: The selective catalytic reduction of NOx by ammonia (NH3-SCR) has widely applied in the abatement of NOx. Fe-ZSM-5 is a potential catalyst, showing high performance in standard SCR (mainly NO) at > 400°C and in fast SCR (NO/NO2 = 1) at ≥ 250°C. The identification of the active species in Fe-ZSM-5 catalysts and reaction mechanism for SCR reactions were investigated by in situ and operando EPR, UV-Vis and FTIR spectroscopy. The spectroscopic studies demonstrate the role of NO2 to reoxidize isolated Fe(II) to the active Fe(III) at β and γ sites, and attribute them the higher activity in fast SCR.

Dissertation Freier Zugang

Titel:

Structural characterization of iron species in Fe-ZSM-5 catalysts and the elucidation of their role in the mechanism of NOx reactions

Beteiligte Personen:

Roxana Pérez Vélez[VerfasserIn]
	1065921160
Ralf Ludwig , Prof. Dr.[AkademischeR BetreuerIn]
	136437524
	Universität Rostock, Institut für Chemie
Angelika Brückner , Prof. Dr.[AkademischeR BetreuerIn]
	14344526X
	Universität Rostock, Leibniz-Institut für Katalyse

Beteiligte Körperschaften:

Universität Rostock, Mathematisch-Naturwissenschaftliche Fakultät[Grad-verleihende Institution]
	2147083-2

Zusammenfassung:

The selective catalytic reduction of NOx by ammonia (NH3-SCR) has widely applied in the abatement of NOx. Fe-ZSM-5 is a potential catalyst, showing high performance in standard SCR (mainly NO) at > 400°C and in fast SCR (NO/NO2 = 1) at ≥ 250°C. The identification of the active species in Fe-ZSM-5 catalysts and reaction mechanism for SCR reactions were investigated by in situ and operando EPR, UV-Vis and FTIR spectroscopy. The spectroscopic studies demonstrate the role of NO2 to reoxidize isolated Fe(II) to the active Fe(III) at β and γ sites, and attribute them the higher activity in fast SCR. [Englisch]

Dokumenttyp:

Dissertation

Einrichtung:

Mathematisch-Naturwissenschaftliche Fakultät

Sprache:

Englisch

Sachgruppe der DNB:

540 Chemie

Veröffentlichung /
Entstehung:

Rostock

Rostock: Universität Rostock

2015