Related by context. Frequent words. (Click for all words.) 66 diesel particulate filter 62 ceria 62 stoichiometric 62 particulate filter 62 metal hydride 62 Selective Catalytic Reduction SCR 61 adsorbent 61 electrochemically 60 photocatalyst 60 SF6 60 oxyfuel 60 particulate filters 59 solenoid valve 59 sorbent 59 Pyrolysis 59 microporous 59 microchannel 59 ionic liquid 59 thermally stable 59 diesel particulate filters 59 flue gases 58 Reverse osmosis 58 Supercritical 58 exothermic 58 R#a 58 nanoporous 58 fluorocarbons 58 SCR catalyst 58 nitrogen oxide NOx emissions 58 ultrapure water 58 aftertreatment 58 hydride 58 nanoparticulate 57 sorbents 57 Nafion 57 electro static 57 HEPA filtration 57 electrolyser 57 chemically inert 57 adsorbents 57 gas recirculation 57 electrochemical 57 polymerized 57 halogenated 57 aqueous solution 56 conductive polymer 56 diaphragm pumps 56 cerium oxide 56 ionisation 56 thermal oxidizer 56 inorganic compounds 56 hydroxyl radicals 56 gaseous fuels 56 gas chromatograph 56 nanocrystalline 56 electrochemical reaction 56 anionic 56 boron nitride 56 H#O# 56 Glycol 56 gas recirculation EGR 55 anions 55 hydrocracking 55 activated sludge 55 cell SOFC 55 dopant 55 polymer coating 55 Low Temperature 55 nanofiltration 55 passivation 55 micronized 55 titania 55 polymerisation 55 particulate matter PM 55 evaporative emissions 55 Refrigerant 55 pentane 55 nano particle 55 feedwater 55 nitrogen oxides NOx 54 porous silicon 54 NOx reduction 54 solenoid valves 54 thermally conductive 54 paramagnetic 54 siloxane 54 reactants 54 sorption 54 reverse osmosis RO 54 granulate 54 polyamides 54 elution 54 reactant 54 hydrogen chloride 54 centrifugal pump 54 combustion gases 54 elemental sulfur 54 ceramic substrates 54 colorimetric 54 dialysate 54 electrowinning