| ACGIH | American Conference of Governmental Industrial Hygienists |
| AEPD | 2-amino-2-ethyl-1,3-propandiol |
| AMP | 2-amino-2-methyle-1-propanol |
| AMPD | 2-amino-2-methyl-1,3-propandiol |
| Ar | Argon |
| ASHRAE | American Society of Heating, Refrigeration and Air Conditioning Engineers |
| ASU | air separation unit |
| ATR | autothermal reforming |
| AZEP | advanced zero emission power plant |
| BGL | British Gas Lurgi |
| BoA | Braunkohlekraftwerk mit optimierter Anlagentechnik (lignite-fired or Brown coal-fired power station with optimised plant engineering) |
| BOD | biological oxygen demand |
| CA | carbonic anhydrase |
| CAR | ceramic autothermal recovery |
| CC | combined cycle |
| CCS | carbon dioxide (CO2) capture and storage |
| CF | correction factor (considers real gas effects) |
| CFB | circulating fluidised bed |
| CFBC | circulating fluidised bed combustion |
| CH4 | methane |
| CHP | combined heat and power |
| CLC | chemical looping combustion |
| CLM | contained liquid membrane |
| CO | carbon monoxide |
| CO2 | carbon dioxide |
| COS | carbonyl sulfide |
| CPO | catalytic partial oxidation |
| DCC | direct contact cooler |
| DEA | diethanolamine |
| DEG | diethylene glycol |
| DGA | diglycolamine |
| DIPA | diisopropylamine |
| DRA | drag reducing agent |
| ECBM | enhanced coal bed methane |
| ECO | economiser |
| EDTA | ethylenediaminetetraacetic acid |
| EG | ethylene glycol |
| EGR | enhanced gas recovery |
| EMC | electrochemically modulated complexation |
| ENCAP | ENhanced CAPture project |
| EOR | enhanced oil recovery |
| ESA | electric swing adsorption |
| ESP | ElectroStatic Precipitator |
| EU | European Union |
| EVA | evaporator |
| EXH | exhaust (gas) |
| FBHE | fluidised bed heat exchanger |
| FGD | flue gas desulfurisation |
| GDP | gross domestic product |
| GE | General Electric Company |
| GHG | GreenHouse Gas |
| GWP | global warming potential |
| H2 | hydrogen |
| H2O | water |
| H2S | hydrogen sulfide |
| HCN | hydrogen cyanide |
| HEED | hydroxyethylethylenediamine |
| HEEU | hydroxyethylethyleneurea |
| Hg | mercury |
| HHV | higher heating value |
| HP | high pressure |
| HR | heat rate |
| HRSG | heat recovery steam generator |
| HSE | health, safety, and environment |
| HPT | high-pressure turbine |
| HT | high temperature |
| HTC | hydrotalcite |
| HTS | high-temperature water-gas shift |
| HTW | high-temperature Winkler |
| HV | heating value (?) |
| ICE | Internal combustion engines |
| IEA | International Energy Agency |
| IEA GHG | International Energy Agency Greenhouse Gas R&D Programme |
| IGCC | integrated gasification combined cycle |
| IL | ionic liquid |
| IPCC | Intergovernmental Panel on Climate Change |
| IP | intermediate pressure |
| IPT | intermediate pressure turbine |
| IRCC | integrated reforming combined cycle |
| ISO | International Organization for Standardization |
| ITM | ion transport membrane |
| IUPAC | International Union of Pure and Applied Chemistry |
| LHV | lower heating value |
| LIDAR | light detection and ranging |
| LNG | liquefied natural gas |
| LP | low pressure |
| LPT | low-pressure turbine |
| LT | low temperature |
| LTS | low-temperature water-gas shift |
| MCM | mixed conductive membrane |
| MDEA | methyl diethanolamine |
| MEA | monoethanolamine |
| MHI | Mitsubishi heavy industries |
| MIX | mixer |
| MOFs | metal–organic frameworks |
| MMV | measurement, monitoring, and verification |
| MP | medium pressure |
| MWGS | membrane water-gas shift |
| N/A | not available |
| N2 | nitrogen |
| N2O | nitrous oxide |
| NB | nota bene (Latin for pay attention, take notice) |
| NETL | National Energy Technology Laboratory |
| NG | natural gas |
| NGCC | natural gas combined cycle |
| NH3 | ammonia |
| NIOSH | US National Institute of Occupational Safety and Health |
| NIMBY | not in my backyard |
| NO | nitric oxide |
| NOx | term for mono-nitrogen oxides – NO and NO2 |
| NTNU | Norwegian University of Science and Technology |
| NTP | normal temperature (298.15 K or 25 °C) and pressure (1 atm) |
| O2 | oxygen |
| OSHA | US Occupational Safety and Health Administration |
| OSPAR | name of both, a commission and convention for the protection of the marine environment of the north east Atlantic |
| PCC | pulverised coal combustion |
| PE | polyethylene |
| PEI | polyethyleneimine |
| PFBC | pressurised fluidised bed combustion |
| pH | measure of the acidity or basicity of a solution |
| PI | polyimide |
| PLONOR | pose little or no risk to the environment (a list of substances/preparations used and discharged offshore, which are considered to pose little or no risk to the environment; it is prepared and released by OPAR) |
| POX | partial oxidation |
| PP | polypropylene |
| PRE | pre-reformer |
| PS | polysulfone |
| PSA | pressure swing adsorption |
| PTFE | polytetrafluoroethylene |
| PVDF | polyvinylidene fluoride |
| PTFE | polytetrafluoroethylene, also known by the DuPont brand name Teflon |
| RTI | Research Triangle Institute |
| RTIL | room temperature ionic liquids |
| SACS | saline aquifer CO2 storage programme, monitoring the sleipner CO2 injection project |
| SCOC | semi-closed oxy-combustion |
| SCR | selective catalytic reactor (for the removal of NO and NO2) |
| SE | sorption-enhanced |
| SERP | sorption-enhanced reaction process |
| SEWGS | sorption-enhanced water-gas shift |
| SF | supplementary firing |
| SFGD | seawater flue gas desulfurisation |
| SMR | steam methane reforming |
| SNCR | selective non-catalytic reduction |
| SO2 | sulfur dioxide |
| SOFC | solid oxide fuel cell |
| SPECC | specific energy penalty |
| SR | steam reforming |
| ST | steam turbine |
| STP | standard conditions for gases; standard temperature (273.15 K or 0 °C) and pressure (105 Pa) as defined by IUPAC (McNaught 1997) |
| SUP | super-heater |
| TEA | triethanolamine |
| TEG | triethylene glycol |
| THAM | tri(hydroxymethyl) aminomethane |
| THF | tetrahydrofuran |
| ThOD | theoretical oxygen demand |
| TIT | turbine inlet temperature |
| TSA | temperature swing adsorption |
| TSIL | task-specific ionic liquid |
| US | United States (refers to USA) |
| USA | United States of America |
| VPSA | vacuum pressure swing adsorption |
| VSA | vacuum swing adsorption |
| WGS | water-gas shift |
| YSZ | yttria-stabilised zirconia |
