1. Catalysis Research Group School of Chemistry and Physics University of KwaZulu-Natal Durban 4000 South Africa
2. Lehrstuhl für Chemische Reaktionstechnik (CRT) Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Egerlandstr. 3 91058 Erlangen Germany
3. Research Centre for Synthesis and Catalysis Department of Chemistry University of Johannesburg P.O. Box 524 Auckland Park 2006 South Africa
4. Forschungszentrum Jülich GmbH Helmholtz-Institut Erlangen-Nürnberg for Renewable Energy (IEK-11) Egerlandstr. 3 91058 Erlangen Germany