1. Department of Chemistry College of ScienceKing Khalid University Abha 61413 Saudi Arabia
2. Department of Chemical EngineeringUniversiti Teknologi PETRONAS Bandar Seri Iskandar 32610 Perak Malaysia
3. Shale Gas Research Group (SGRG)Institute of Hydrocarbon Recovery (IHR)Universiti Teknologi PETRONAS Bandar Seri Iskandar 32610 Perak Malaysia
4. Department of Chemical EngineeringCOMSATS University Islamabad Lahore Campus, Defense Road Punjab 54000 Pakistan