468774 Bifunctional Porous Materials for Combined CO2 Capture and Catalytic Conversion

Tuesday, November 15, 2016: 5:28 PM
Golden Gate 8 (Hilton San Francisco Union Square)
Angus Crake, Imperial College London, London, United Kingdom and Camille Petit, Department of Chemical Engineering, Imperial College London, London, United Kingdom

The rapidly-increasing concentration of Greenhouse Gases (GHGs) in the atmosphere has become a critical issue prompting the scientific and engineering community to find ways to efficiently mitigate emissions of GHGs, such as CO2. Electricity generation using fossil fuels is one of the major contributors of CO2 emissions and therefore, various end-of-the pipe technologies are currently proposed as carbon management media. A less energy intensive alternative than amine-based solvents are solid adsorbents which are capable of CO2 capture at low temperatures as part of the Carbon Capture Utilisation and Storage process (CCUS). Another interesting development in CCUS research is the use of captured CO2 as a chemical feedstock. Although this pathway will not eliminate the need for long term CO2 storage, carbon utilisation could diversify the range of possibilities

Metal-organic frameworks (MOFs) represent a class of adsorbents with chemical and structural tunability, large porosity as well as high thermal and chemical stability. Owing to these features, MOFs are promising materials for CO2 capture. In addition, recent research efforts point to the potential use of MOFs as photocatalysts, especially in the context of CO2 reduction into useful products (e.g. CO and CH4). Considering these two aspects, we are investigating the application of MOFs as bifunctional absorbent-photocatalyst materials for the combined capture and conversion of CO2. This approach could potentially enable process intensification and improvement of the overall Carbon Capture Utilisation and Storage process sustainability. A series of MOFs were synthesised and fully characterised by a range of analytical and spectroscopic techniques (i.e. XRD, FT-IR, thermogravimetric analysis, N2 sorption). These MOFs were tested as CO2 adsorbents as well as heterogeneous CO2 reduction photocatalysts in the gas phase using a purpose-built reactor. In the latter case, H2 and H2O as sacrificial agents under mild reaction conditions (ambient temperature and pressure). Products were analysed using a GC-MS and the MOFs were characterised after testing to identify any change in structure and/or chemistry. The results were used to identify mechanisms of reactions.

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