KOH-promoted Pt/Al2O3 catalysts for water gas shift and methanol steam reforming: An operando DRIFTS-MS study

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Details zur Publikation

Autor(en): Kaftan A, Kusche M, Laurin M, Wasserscheid P, Libuda J
Zeitschrift: Applied Catalysis B-Environmental
Verlag: Elsevier
Jahr der Veröffentlichung: 2017
Band: 201
Seitenbereich: 169-181
ISSN: 0926-3373


Abstract


The performance of KOH-modified Pt/AlO catalysts has been investigated under the conditions of the water-gas shift (WGS) reaction and methanol steam reforming (MSR) with diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS) coupled with online quadrupole mass spectrometry (QMS). We demonstrate that both the activity and the selectivity are enhanced in comparison to the uncoated catalyst by applying a thin coating of KOH. By means of IR spectroscopy, we were able to follow the formation of surface species on two different types of catalysts. During reaction, primarily formates are observed on the uncoated catalyst while a film of hydroxides and carbonates is observed on the KOH-coated sample. Additionally, the vibrational bands of CO adsorbed on Pt suggest a strong modification of the electronic structure of the Pt particles by K-coadsorption, leading to a weakening C[sbnd]O bond and a strengthening of the Pt[sbnd]C bond. As a result, we observe an increased selectivity to CO on the KOH modified system.



FAU-Autoren / FAU-Herausgeber

Kaftan, Andre
Lehrstuhl für Physikalische Chemie II
Kusche, Matthias
Lehrstuhl für Chemische Reaktionstechnik
Laurin, Mathias Dr.
Lehrstuhl für Physikalische Chemie II
Libuda, Jörg Prof. Dr.
Professur für Physikalische Chemie
Wasserscheid, Peter Prof. Dr.
Lehrstuhl für Chemische Reaktionstechnik


Zusätzliche Organisationseinheit(en)
Exzellenz-Cluster Engineering of Advanced Materials


Zitierweisen

APA:
Kaftan, A., Kusche, M., Laurin, M., Wasserscheid, P., & Libuda, J. (2017). KOH-promoted Pt/Al2O3 catalysts for water gas shift and methanol steam reforming: An operando DRIFTS-MS study. Applied Catalysis B-Environmental, 201, 169-181. https://dx.doi.org/10.1016/j.apcatb.2016.08.016

MLA:
Kaftan, Andre, et al. "KOH-promoted Pt/Al2O3 catalysts for water gas shift and methanol steam reforming: An operando DRIFTS-MS study." Applied Catalysis B-Environmental 201 (2017): 169-181.

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Zuletzt aktualisiert 2018-11-11 um 13:50