| EGD | European Green Deal |
| EU | European Union |
| PtG | Power-to-Gas |
| lCO2 | Liquid CO2 |
| scCO2 | Supercritical CO2 |
| RWGS | Reverse Water–Gas Shift |
| AG | Aerogel |
| XG | Xerogel |
| ICP-OES | Inductively Coupled Plasma–Optical Emission Spectroscopy |
| BET | Brunauer, Emmet, and Teller Theory |
| BJH | Barrett–Joyner–Halenda |
| TEM | Transmission Electron Microscopy |
| HAADF | High-Angle Annular Dark Field |
| EDX | Energy-Dispersive X-Ray Spectroscopy |
| XRD | X-Ray Diffraction |
| XPS | X-Ray Photoelectron Spectroscopy |
| UV-vis DRS | UV–Visible Diffuse Reflectance Spectroscopy |
| H2-TPR | H2 Temperature-Programmed Reduction |
| TCD | Thermal Conductivity Detector |
| FID | Flame Ionization Detector |
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