1. School
of Chemistry and Physics, University of KwaZulu-Natal, Durban 4000, South Africa
2. Sasol South Africa (Pty) Ltd, Group Technology R&T, 1 Klasie Havenga Street, Sasolburg 1974, South Africa
3. Cardiff
Catalysis Institute, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, United Kingdom