These authors contributed equally to the work.
Promotional Effect of Ni on a CrOx Catalyst Supported on Silica in the Oxidative Dehydrogenation of Propane with CO2
Article first published online: 24 OCT 2012
Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Volume 4, Issue 12, pages 1952–1959, December 2012
How to Cite
Yun, D., Baek, J., Choi, Y., Kim, W., Lee, H. J. and Yi, J. (2012), Promotional Effect of Ni on a CrOx Catalyst Supported on Silica in the Oxidative Dehydrogenation of Propane with CO2. ChemCatChem, 4: 1952–1959. doi: 10.1002/cctc.201200397
- Issue published online: 28 NOV 2012
- Article first published online: 24 OCT 2012
- Manuscript Received: 20 JUN 2012
- GS Caltex Corporation
- WCU (World Class University)
- Ministry of Education, Science and Technology. Grant Number: R31-10013
- supported catalysts;
As CrOx catalysts supported on the SBA-15 support (Cr/Si) are highly active, they represent potentially promising catalysts for the oxidative dehydrogenation of propane with CO2 (ODHP). However, reduction of the active sites (Cr3+) during the reaction is known to lead to severe deactivation. The findings reported herein indicate that after the addition of 0.5 wt % Ni to 10 wt % Cr/Si (0.5 Ni-Cr/Si), the catalytic activity was stable and the selectivity was high. Reduced CrOx was easily regenerated by the addition of Ni, as evidenced by a three-step H2-temperature programmed reduction analysis. In addition, ex situ XPS results revealed that Cr3+ was maintained only in the Ni-promoted catalyst whereas Cr3+ was easily reduced to Cr2+ in the non-promoted catalyst during the reaction. The role of the Ni added to the catalyst elucidates that Ni induces the dissociation of CO2 to CO and activated O (O*ads). Then, the generated O*ads regenerates the reduced CrOx. Consequently, the Ni-promoted Cr/Si catalyst enhances the catalytic stability of propylene in the ODHP reaction.