Adsorption of carbon dioxide and a hydrogen-carbon dioxide mixture

Methane can be converted into hydrogen, but removal of byproduct carbon dioxide is expensive. Methane production from coalbed reservoirs can be increased by injecting carbon dioxide, storing the carbon dioxide. To examine the potential of using the hydrogen-carbon dioxide as an injectant in coalbed methane reservoir to enhance methane production and store carbon dioxide without loss of hydrogen details on the sorption properties of such a system must be known. The Gibbs sorption of a hydrogen-carbon dioxide (80-20 mole %) mixture and pure carbon dioxide is measured on a water equilibrated medium rank coal at ~322 K to 150 bar. To ensure the reliability of the data duplicate experiments are performed in separate setups. The sensitivity of volumetric sorption measurements for systematic uncertainties is demonstrated.