CO2 Capture from Natural Gas: Development of Adsorbents and Accompanying Processes
Work continued on zeolite, ZSM-25 as little work exists on this material and it initial works show it to be promising for CO2/CH4 separation.
CO2 CAPTURE FROM NATURAL GAS: DEVELOPMENT OF
ADSORBENTS AND ACCOMPANYING PROCESSES
Lefu Tao, David Danaci, Ranjeet Singh, Penny Xiao, Paul Webley
Work continued on zeolite, ZSM-25 as little work exists on this material and it initial works show it to be promising for CO<sub>2</sub>/CH<sub>4</sub> separation. Our work has shown that additional efforts are required on the reproducible synthesis of the material and initial adsorption work has demonstrated that there may be an application in the kinetic separation of CO<sub>2</sub> from CH<sub>4</sub> as the diffusion of CH<sub>4</sub> appears to be slower than CO<sub>2</sub>. 2016 will see the completion of the fundamental ZIF study, ideally a successfully synthesised core-shell zeolite and an outcome on the suitability of ZSM-25 for CO<sub>2</sub> /CH<sub>4</sub> separations. In 2016/2017 we successfully synthesized several ion exchange versions of this material and it is currently under study.
In 2016 we started to operate the Otway carbon capture rig. This field unit is in the Otway basin and uses high CO<sub>2</sub> concentration well gas as the feed. A two bed PSA system capable of operation to 100 bar has been designed. Initial tests with silica adsorbent
have been promising and we are now in the process of synthesizing a more advanced adsorbent for further testing.