The morphology of rhodium supported on TiO2 and Al2O3 as studied by temperature-programmed reduction-oxidation and transmission electron microscopy

J.C. Vis, H.F.J. Blik, van 't, T. Huizinga, J. Grondelle, van, R. Prins

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Abstract

Supported Rh/Al2O3 and Rh/TiO2 catalysts with varying metal loadings were investigated by chemisorption and temperature-programmed reduction and oxidation. Hydrogen chemisorption showed that all the Rh on Al2O3 was well dispersed (H/Rh > 1 for loadings below 5 wt% and H/>Rh > 0.5 up to 20 wt%), while the dispersion on TiO2 was much lower. TPR/TPO showed that this was due to the growth of two different kinds of Rh/Rh2O3 particles on TiO2; one kind was easily reduced/oxidized, with a high dispersion, and the other kind was harder to reduce/oxidize, with a lower dispersion. TEM showed that the first kind of Rh2O3 consisted of flat, raftlike particles and the second kind of spherical particles.
Original languageEnglish
Pages (from-to)333-345
Number of pages13
JournalJournal of Catalysis
Volume95
Issue number2
DOIs
Publication statusPublished - 1985

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