Laphrom, T., Janpa, P. and Rungrojchaipon, P. 2021. Catalytic Study of KMnO4-Zeolite 13X Catalyst for the Synthesis of Glycerol Carbonate from Carbonylation of Glycerol and Urea. Journal of Science Ladkrabang. 30, 1 (Apr. 2021), 69–80.