Combustion and CO2 purification

Combustion and CO2 purification

On-line (stepped) combustion
Off-line (sealed) combustion
Na-borosilicate glass tubes by Pyrex® and glass valves by Kontes® with Viton® seals
Final pressure of the system is 3 × 10–5 mbar
200 – 1000°C temperature range

On-Line Combustion and CO2 Purification Line

Samples can be combusted in the presence of solid oxidizing reagents or oxygen gas. The system uses Na-borosilicate glass tubes by Pyrex® and glass valves by Kontes® with Viton® seals. The final pressure of the system is 3 × 10–5 mbar ensured by dry scroll vacuum pump and turbomolecular pump. The combustion vessel is heated by a temperature regulated furnace which allows a stepped combustion of samples in the 200 – 1000°C temperature range. The carbon dioxide is cryogenically separated from water, passed over a cleaning furnace (Cu/Ag) to reduce contaminants, and trapped in a known volume. The CO2 gas pressure measured by a high precision MKS Baratron pressure gauge, is indicating the combustion yield.

Off-Line Combustion and CO2 Purification Line

Samples are placed in a glass tube together with the oxidizing reagents. The tube is evacuated and sealed, then placed to the muffle furnace and combusted in a low temperature. The CO2 formed is cryogenically purified and converted into solid graphite.

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