Related by context. Frequent words. (Click for all words.) 66 HFC #a 61 urea injection 60 particulate filters 59 fluorocarbons 58 R#a 56 particulate filter 55 refrigerant 55 diesel particulate filter 55 fluorinated gases 55 Nitrogen oxides 54 halogenated 54 DPFs 54 refrigerants 53 unburned hydrocarbons 53 diesel particulate filter DPF 53 metal hydride 53 diesel particulate filters 53 oxidizing agent 53 nano coating 53 exhaust aftertreatment 53 exothermic 53 conventional internal combustion 53 oxidizers 53 evaporative emissions 53 polyamides 53 hybrid powertrains 53 biomass combustion 53 combustion 53 stoichiometric 53 gas recirculation 52 electrically driven 52 dehumidifying 52 chemically inert 52 nitrous oxides 52 fluorinated 52 compression ignition 52 evaporative 52 acoustic insulation 52 exhaust gases 52 nitrogen oxide NOx emissions 52 hydraulic fluids 52 sulfur dioxides 52 de ionized 51 reduce NOx emissions 51 chemical reactivity 51 halon 51 oxidising 51 hydride 51 superheat 51 emmissions 51 combustor 51 enthalpy 51 oxidiser 51 Reverse osmosis 51 exhaust emission 51 unvented 51 emits #g/km [002] 51 ammonia borane 51 photocatalytic 51 HCFC 51 Nafion 51 BlueTec 51 supercritical 51 nitrogenous 51 atmospheric pollutants 51 8 CYL 51 metal hydrides 51 dehumidify 51 aftertreatment 51 Diesel exhaust 51 ethylene oxide 50 scramjets 50 ionisation 50 reactants 50 halide 50 BlueEFFICIENCY 50 #.degree [002] 50 toxic solvents 50 polyurethane foams 50 adipic acid 50 gas recirculation EGR 50 hydrides 50 condensing boilers 50 selective catalytic reduction 50 ASTM D# [002] 50 Volatile organic compounds 50 Refrigerant 50 ionic liquid 50 pollutants emitted 50 Selective Catalytic Reduction SCR 50 oxidise 50 aqueous phase 50 adsorbents 50 humidify 50 gaseous emissions 50 Fischer Tropsch process 50 electrolyzer 50 SF6 49 spark ignition 49 ionised 49 ceria