Insights into the redox kinetics of vanadium substituted heteropoly acids through liquid core waveguide membrane microreactor studies
Albert J, Ponce S, Drochner A, Trabold M, Etzold B (2019)
Publication Status: Published
Publication Type: Journal article, Original article
Publication year: 2019
Journal
Publisher: Elsevier B.V.
Book Volume: 369
Pages Range: 443-450
DOI: 10.1016/j.cej.2019.03.103
Abstract
A liquid core waveguide membrane microreactor is a novel concept that allows in situ spectroscopy to be carried out in an optical microreactor, while enabling a very high gas-to-liquid mass transfer. The potential of this reactor concept to derive kinetics in gas/liquid reactions is demonstrated using the heteropoly acids catalyzed oxidation of biomass to formic acid (the ‘OxFA process’). For vanadium-substituted, Keggin-type heteropoly acids, the kinetics of the reduction and reoxidation step of the catalyst cycle was deduced using in situ UV/Vis spectroscopy. Reduction was studied from 40 to 80 °C: a strong dependency of the reduction kinetics was deduced. In combination with additional cyclic voltammetry and EPR characterization, it can be assumed that two active centers promote this reaction, while the existence and proportions of both types depends on the degree of vanadium substitution. The rapid mass transfer allowed transient response experiments to be carried out for the reoxidation step, which was studied up to 150 °C. Switching from anaerobic to aerobic conditions, an even stronger dependency of the reoxidation kinetics on the degree of vanadium substitution was revealed.
Authors with CRIS profile
Jakob Albert
Lehrstuhl für Chemische Reaktionstechnik
Bastian Etzold
Professur für Katalytische Materialien
Involved external institutions
Germany (DE)How to cite
APA:
Albert, J., Ponce, S., Drochner, A., Trabold, M., & Etzold, B. (2019). Insights into the redox kinetics of vanadium substituted heteropoly acids through liquid core waveguide membrane microreactor studies. Chemical Engineering Journal, 369, 443-450. https://dx.doi.org/10.1016/j.cej.2019.03.103
MLA:
Albert, Jakob, et al. "Insights into the redox kinetics of vanadium substituted heteropoly acids through liquid core waveguide membrane microreactor studies." Chemical Engineering Journal 369 (2019): 443-450.
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