Posted on 23 June 20176 July 2017 by felpin93 – Biodiesel production from palm oil using sulfonated graphene catalyst Nongbe, M. C.; Ekou, T.; Ekou, L.; Benjamain, Y. K. ; Le Grognec, E. ; Felpin, F.-X. Renew. Energy 2017, 106, 135-141, DOI