Related by context. Frequent words. (Click for all words.) 56 alcohols 55 feedstocks 54 fossil fuels 53 butanol 52 liquid fuels 51 biofuels 50 Fossil fuels 50 fossil fuel 50 internal combustion engines 50 biobutanol 49 biofuel 49 cellulosic 49 isobutanol 49 bio fuels 48 cellulosic biomass 48 fuels 48 Cellulosic ethanol 48 feedstock 48 yeasts 47 methanol 47 cellulose 47 corn ethanol 46 alternative fuels 46 Fischer Tropsch 46 Methanol 46 agricultural residues 46 pyrolysis 46 syngas 46 reactants 46 cellulosic biofuels 46 esters 45 ionic liquids 45 organic acids 45 biomass fuels 45 bio ethanol 45 glycerol 45 crop residues 44 bioethanol 44 ethanol 44 hydrogen 44 renewable fuels 44 cellulosic ethanol 44 malted barley 44 oilseed crops 44 byproducts 43 solvents 43 PEM fuel 43 BioOil 43 bioavailable 43 hydrocarbons 43 biomass 43 oxidant 43 vegetable oils 42 organic solvents 42 lignin 42 formic acid 42 combustion 42 acetaldehyde 42 environmentally benign 42 starches 42 ketones 42 cleaner fuels 42 polyols 41 carbons 41 fermentation 41 polyol 41 biodiesel 41 internal combustion 41 fermented 41 remove impurities 41 soluble 41 hydrogenation 41 carbonated 41 potable 41 aromatics 41 biopolymers 41 sugarcane ethanol 41 supercritical 41 refrigerants 41 combustion engines 41 renewable 40 synthetic fuels 40 hexane 40 corn stover 40 ultracapacitors 40 flue gases 40 sugars 40 potassium hydroxide 40 gaseous 40 ethyl alcohol 40 hydrocarbon 40 gasification 40 bagasse 40 switchgrass 40 petroleum 40 fructose 40 distillation 40 catalysis 40 ASTM D# [002] 39 emulsifiers 39 stouts