In‐Situ Chemical Trapping of Oxygen in the Splitting of Carbon Dioxide by Plasma

A crucial step in the plasma splitting of carbon dioxide is the separation of the conversion products, and this is not straightforward, especially for separating O 2 from CO 2 and CO. In this work the trapping of atomic oxygen by adding a hydrogen source, which enhances the chemical conversion into water, is demonstrated. The experimental and modelling results show that by adding 3% of H 2 and 2% of CH 4 most of the oxygen can be trapped at a CO 2 conversion of ±2.5%. The identified products formed by the addition of CH 4 or H 2 are mainly H 2 O and in the case of CH 4 also H 2 . Adding a hydrogen source thus leads to the removal of O 2 , leaving behind a gas mixture that can be more easily separated.