MIL-100(Fe) Derived Catalysts for CO2 to Hydrocarbons Conversion
5 Pages Posted: 15 Apr 2019 Last revised: 15 May 2019
Date Written: October 21, 2018
A MIL-100(Fe) type metal organic framework (MOF) was thermally decomposed, both neat and as laden with silica precursors, with the intent to prepare catalysts with well dispersed Fe, for CO2 conversion to hydrocarbons via reformation with H2. High surface area catalysts were derived with up to ~49 wt % Fe content, the Fe content being inversely proportional to their silica content. MOF pyrolysis led to products containing Fe in metallic form. Subsequent calcination of the silica laden pyrolysis products provided the Fe as Fe2O3. All the MIL-100(Fe) derivation products effected some conversion of CO2. Their catalytic activity was found to improve with temperature and pressure, and was inversely proportional to their silica loading. The direct pyrolysis product, with the highest activity, effected ~60 % H2 consumption at 400 °C and 40 bar. Notably, the reaction conditions reduced the Fe2O3 of calcined silica laden products to Fe3O4.
Keywords: CO2 for energy (storage), GHGT-14, CO2, conversion, utilisation, MIL-100(Fe), Fisher-Tropsch, hydrocarbon synthesis, hydrogenation, hydrogen reformation, H2, Fe3O4
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