1. Department of Chemistry; University of Kalyani; Kalyani Nadia 741235, W.B. India
2. Department of Chemistry; University of Calcutta; 92 APC Road Kolkata 700 009 India
3. Catalytic Conversion & Processes Division; CSIR-Indian Institute of Petroleum; Dehradun Uttarakhand 248005 India
4. European Bioenergy Research Institute; Aston University; Birmingham B4 7ET UK