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The Effect of Chlorine and Support Dissolution on Hydrogen Chemisorption on Ru/Al2O3 Catalyst

Okal J.

Polish Journal of Chemistry

2007

Vol. 81, nr 1

69-77

Hydrogen chemisorption at 20–200°C was studied volumetrically on Ru/gamma-Al2O3 catalysts (4.6 and 10.8% of Ru) prepared from ruthenium chloride. The structure of the catalysts was determined by ICP-AES, BET, TEM and XRD methods. Large amount of Cl– was retained on the catalysts after H2 reduction at 500°C. Ruthenium dispersion determined by the hydrogen chemisorption technique was found to be inaccurate due to the contamination of the ruthenium surface – during preparation of the catalysts – by chlorine from precursor and/or aluminum ions from the support. For the Ru/-Al2O3 catalystswith high chlorine content, the mean particle sizes estimated from irreversible H2 chemisorption at 100°C, were much greater than that obtained by TEM and XRD. The difference was much smaller for the catalysts subjected to washing procedure removing chlorine ions.