Why is ethanol more exothermic than glycerol?

a href="http://www.iei.liu.se/envtech/forskning/forskningsprojekt/synergies-biofuels/synergies-inventory-research/biodiesel-synergies-inventory/inventory-of-biodiesel-synergies/1.178564/SteamReformingGlycerolforHydrogenProduction.pdf" rel="nofollow"http://www.iei.liu.se/envtech/forskning/…/a will help.