1. Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India
2. Nano Catalysis Area, LSPD, CSIR─Indian Institute of Petroleum, Dehradun 248005, Uttarakhand, India
3. Department of Mathematics, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India