(706a) Iron Oxide Supported on Silicalite-1 As a Multifunctional Material for Biomass Chemical Looping Gasification and Syngas Upgrading

Iron oxide supported on silicatite-1 was synthesized as a novel oxygen carrier for biomass chemical looping gasification (BCLG) with additional functionalities of its reduced form as a catalyst for catalytic decomposition of tar and an adsorbent for capturing CO₂ in syngas. The temperature-programmed-reduction/oxidation profiles showed that the iron oxide supported on silicatite-1 had lower reduction and oxidation temperatures than the iron oxide supported on conventional silica. It was found the iron oxide supported on silicatite-1 was resistant to the formation of strong metal-support interaction and irreversible silicate at a high temperature and exhibited high thermal/chemical stability in a cyclic process. The experimental results showed that the novel oxygen carrier can gasify biomass into high value compounds of H₂ and CO at a moderate temperature. After reduction at 800^oC, the iron supported on siliclaite-1 showed higher catalytic activity in tar decomposition than on a conventional silica support, due to the higher surface area and better metal dispersion. As an adsorbent for CO₂ capture, the reduced oxygen carrier with 15% Fe had a 1.01 mmol/g CO₂ adsorption capacity at 1 atmosphere pressure, which is comparable to other CO₂ adsorbents reported in literature. Therefore, the iron oxide supported on silicatite-1 is an effective looping material as an oxygen carrier for biomass gasification, a catalyst for tar decomposition and an adsorbent for CO₂ capturing.