Edinburgh, United Kingdom


Microwave Swing MSAS (UK3.3)


The microwave swing system can be used for CO2 capture using solid adsorbents and liquid solvents, and can measure the power consumption for CO2 capture.

The microwave swing gas separation system can be used for CO2 capture using both solid adsorbents and liquid solvents, and can measure the power consumption for CO2 capture.The microwave separation system is illustrated in Fig. 1.

The system consists of a WR340 rectangular waveguide (86.36 mm 43.18 mm) connected to a 2450 MHz magnetron (GAE Inc., GA4001, maximum power 1.2 kW, peak voltage 4.5 kV) controlled by an Alter SM445 switching power supply. The waveguide incorporates a three-port circulator (GAE Inc., GA1105) with a cross dummy load, a dual-directional coupler (GAE Inc., GA310x, coupling factor 60 dB, directivity 23 dB) with GA3301 coupler power interfaces, a three-stub tuner (GAE Inc., GA1005), universal waveguide applicator (GAE Inc., GA600x), and a sliding short circuit (Sairem). The microwaves are generated by the magnetron with an adjustable input power setting and are then directed through the circulator and down the longitudinal axis of the waveguide.

 The WR340 waveguide propagates the microwave electric field in the dominant TE10 mode (guide wavelength = 17.35 cm), meaning that the electric field is uniform and transverse to the direction of propagation. After passing through the dual-directional coupler and three-stub tuner, the input wave travels through the waveguide applicator and interacts with the loaded sample. The wave then undergoes reflection at normal incidence from the short circuit and is directed back through the sample region along the reverse direction of the input wave, where finally the power is dumped into the dummy (water) load. A superposition of the forward and reflected waves creates a standing wave within the sample interaction region. The three-stub tuner and sliding short circuit are manually adjusted before each set of experiments to minimize impedance mismatch of the sample load and shift the peak of the electric field intensity to the sample. This ensures maximum power transfer efficiency during the microwave heating. The dual-directional coupler monitors the forward and reverse power flow across the waveguide.

State of the Art, uniqueness & specific advantages

The microwave swing system can be used for CO2 capture using solid adsorbents and liquid solvents, and can measure the power consumption for CO2 capture.

Operating by

The University of Edinburgh

The University of Edinburgh
United Kingdom
CAPTURE technologies:
Solvents, Sorbents, Measurement of power consumption for CO2 capture
Research Fields:
Fluid dynamics, Chemistry/Geochemistry, Material science, Modelling, Physical processes, Engineering, Thermodynamics
Facility's fact sheet

Location & Contacts

Edinburgh, United Kingdom
Professor Xianfeng Fan
RICC Contacts - Secondary contact
Simon Gregory

Facility Availability

Unit of access (UA)
Availability per year (in UA)
7 days
Duration of a typical access (average) and number of external users expected for that access
3 days per experiment
Average number of external users expected for typical access

Quality Control / Quality Assurance (QA)

Activities / tests / data are
State of Quality: n/a

Operational or other constraints

Specific risks:
Legal issues

CCUS Projects

Other CCUS Projects
A compact CO2 capture process to combat industrial emissions
Teaming up to Advance the Development of Energy-Smart Compact Carbon-Scrubbing Technologies

Selected Publications

International Journal of Greenhouse Gas Control 79, 165-172 (2018)
Microwave regeneration of monoethanolamine aqueous solutions used for CO2 capture
F Bougie, X Fan
Applied Energy, 192, 126–133 (2017)
Microwave Swing Regeneration of Aqueous Monoethanolamine for Post-Combustion CO2 Capture
S.J. McGurk, C.F. Martín, S. Brandani, M.B. Sweatman, X. Fan
Applied Energy, 183, 1705–1721 (2016)
Wet impregnation of a commercial low cost silica using DETA for a fast post-combustion CO2 capture process
C.F. Martín, M.B. Sweatman, S. Brandani, X. Fan