Abstract
The paper explores several alternative ways for improving the performance of zinc ferrites, which are common high-throughput sorbents used in hot gas desulphurisation processes (IGCC). The catalysts have been prepared by supporting the pure oxides (zinc and iron oxides) in porous supports (sepiolite, ZrO 2 and zeolite) that provides the necessary strength. The active phase (zinc ferrite) is “in situ” synthesized as combined mixed oxides with a spinel structure, produced after calcination at high temperature. It has been found that the preparation method has a strong influence on the spatial distribution of the chemical species inside the pellet. In some cases, it is even possible to produce a profile where metallic oxides concentrate near the outer edge of the particle. According to XRD, it is found a preferential formation of enstatite phase rather than franklinite, due to substitution of interstitial ions in the framework of supports for Fe 2+ and Zn 2+. These conclusions set up strong requirements for the synthesis of specific sorbents in FGD reactions. This can be achieved by means of a combination of different preparation methodologies, which allow selecting the metallic ions and the supports in order to build the active spinels required for the FGD reaction.
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