1. College of Chemical and Pharmaceutical Engineering Hebei University of Science and Technology Shijiazhuang 050018 P. R. China
2. Department of Chemical Engineering University of Johannesburg Johannesburg 2028 South Africa
3. Key Laboratory for Green Chemical Technology of Ministry of Education Tianjin University Tianjin 300072 P. R. China
4. Sinopec Research Institute of Petroleum Processing Beijing 100728 P. R. China
5. Institute for the Development of Energy for African Sustainability (IDEAS) University of South Africa (UNISA) Florida 1710 South Africa
6. African Energy Leadership Centre WITS Business School and Molecular Science Institute School of Chemistry University of Witwatersrand Johannesburg 2050 South Africa