Related by context. Frequent words. (Click for all words.) 62 combustion chamber 59 exhaust gases 59 pyrolysis 57 syngas 57 Combustion 56 gasifier 56 oxidizer 55 particulate emissions 55 gasification 55 vaporization 54 internal combustion engines 53 NOx 53 oxidation 53 gases 53 NOx emissions 53 ignition 53 vapor 52 water vapor 52 ionization 51 cavitation 51 combustion engines 51 gasses 51 flue gas 51 oxidant 51 gaseous 51 evaporator 51 combustion engine 51 methane 51 internal combustion 51 diesel particulate filter 51 fuel injector 50 turbocharging 50 pollutant emissions 50 particulates 50 turbocharger 50 compressed air 50 evaporative 50 biomass gasification 50 combusted 50 particulate filter 49 exhaust emissions 49 condenser 49 fermentation 49 recirculation 49 particulate 49 diesel engines 49 biomass 49 internal combustion engine 49 CO2 49 electrochemical 49 boilers 48 nitrogen oxides 48 adsorption 48 heat exchangers 48 heat exchanger 48 carbon dioxide CO2 48 hydrogen 48 supercritical 48 combust 48 polymerization 48 evaporators 48 microturbine 48 exhaust manifold 48 VOCs 48 organic solvents 47 intake valve 47 selective catalytic reduction 47 methanol 47 carbon dioxide 47 emission 47 diesel engine 47 ventilation 47 humidification 47 PEM fuel 47 SOFC 47 airflow 46 radioactive decay 46 catalytic 46 refrigerant 46 Ventilation 46 nitrous oxide emissions 46 amine 46 sintering 46 convection 46 ionizing 46 vapors 46 thermodynamic 46 nitrogen oxide emissions 45 hydrogenation 45 lubrication 45 biogas 45 solvents 45 viscosity 45 hydrolysis 45 furnaces 45 propellants 45 thermoelectric 45 compressor 45 GHGs 45 electrically driven 45 fuel injectors