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Bismuth-doped ceria, Ce0.90Bi0.10O2: a selective and stable catalyst for clean hydrogen combustion

Beckers, Jurriaan, Lee, Adam Fraser and Rothenberg, Gadi 2009. Bismuth-doped ceria, Ce0.90Bi0.10O2: a selective and stable catalyst for clean hydrogen combustion. Advanced Synthesis & Catalysis 351 (10) , pp. 1557-1566. 10.1002/adsc.200900089

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Abstract

Bismuth-doped cerias are successfully applied as solid “oxygen reservoirs” in the oxidative dehydrogenation of propane. The lattice oxygen of the ceria is used to selectively combust hydrogen from the dehydrogenation mixture at 550 °C. This process has three key advantages: it shifts the dehydrogenation equilibrium to the desired products side, generates heat, aiding the endothermic dehydrogenation, and simplifies product separation (water vs. hydrogen). Furthermore, the process is safer, since it uses the catalyst’s lattice oxygen instead of gaseous oxygen. We show here that bismuth-doped cerias are highly active and stable towards hydrogen combustion, and explore four different approaches for optimising their application in the oxidative dehydrogenation of propane: first, the addition of extra hydrogen which lowers hydrocarbon conversion by suppressing both combustion and coking; second, the addition of tin which completely inhibits coking; third, the addition of platinum which increases selectivity, but at the expense of lower activity. The best results are obtained through tuning the reaction temperature. At 400 °C, high activity and selectivity were obtained for the bismuth-doped ceria Ce0.90Bi0.10O2. Here, 90% of the hydrogen feed is converted at 98% selectivity. This optimal reaction temperature can be rationalised from the hydrogen and propene temperature-programmed reduction (TPR) profiles: 400 °C lies above the reduction maximum of hydrogen, yet below that of propene. That is, this temperature is sufficiently high to facilitate rapid hydrogen combustion, but low enough to prevent hydrocarbon conversion.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: bismuth; ceria (CeO2); doping; oxidative dehydrogenation (ODH); selective oxidation; temperature-programmed reduction (TPR)
Publisher: Wiley
ISSN: 1615-4150
Last Modified: 19 Mar 2016 22:40
URI: http://orca.cf.ac.uk/id/eprint/23698

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