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

• Autorzy: Okal J.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

Ru/gamma-Al2O3 catalyst; Ru metal dispersion; hydrogen hemisorption

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2007
• Tom: Vol. 81, nr 1
• Strony: 69--77
• Opis fizyczny: Bibliogr. 25 poz., rys.

Twórcy

autor

Okal J.

• Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław, Poland

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