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Issue 8, 2011
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The significance of the order of impregnation on the activity of vanadia promoted palladium-alumina catalysts for propane total oxidation

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Abstract

The increased activity of alumina-supported palladium catalysts promoted with vanadium oxide has been investigated. Three different vanadium promoted Pd/Al2O3 catalysts with the same composition but synthesized employing sequential and co-impregnation were tested for the total oxidation of propane. The order of impregnation was critical to produce high activity catalysts. Vanadium and palladium co-impregnation on the Al2O3 support led to the most active catalyst, whereas the step-wise impregnated catalysts show a catalytic performance similar to or slightly better than unpromoted palladium catalysts. The high activity of the co-impregnated catalysts is related to the particle size and oxidation state of the palladium particles; and to the redox properties of vanadium species. The most active catalyst presents relatively large palladium particles in combination with increased reducibility of vanadium species and a relatively high amount of V4+ within the bulk of the catalyst and on the surface. STEM shows that, compared to catalysts containing only Pd or V, co-addition of the Pd and V species drastically altered the particle size distribution and morphology of the PdOx particles, and simultaneously caused the monolayer dispersion of the VOx species to become much patchier in nature. It also showed that the microstructure of the catalysts was similar for the different orders of impregnation, but some differences between the morphology of PdOx particles were observed.

Graphical abstract: The significance of the order of impregnation on the activity of vanadia promoted palladium-alumina catalysts for propane total oxidation

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Publication details

The article was received on 28 Oct 2010, accepted on 10 Aug 2011 and first published on 24 Aug 2011


Article type: Paper
DOI: 10.1039/C0CY00032A
Catal. Sci. Technol., 2011,1, 1367-1375

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    The significance of the order of impregnation on the activity of vanadia promoted palladium-alumina catalysts for propane total oxidation

    T. Garcia, W. Weng, B. Solsona, E. Carter, A. F. Carley, C. J. Kiely and S. H. Taylor, Catal. Sci. Technol., 2011, 1, 1367
    DOI: 10.1039/C0CY00032A

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