the importance of the precursor to prepare high temperature water -gas shift reaction catalysts

Fe-Cr-Cu catalysts were prepared and studied in regard to their performance in the high-temperature water-gas shift reaction (HTS), which is the key step of hydrogen and ammonia industrial plants. In this work, the effect of the precursor on the activity of magnetite-based catalysts prepared by precipitating a composition containing divalent and trivalent iron compounds and a modifier trivalent chromium with a base, was studied in terms of CO conversion. The production of catalysts in their active form avoids the step of activation prior to use, in industrial processes. Sulfates and chlorides were the selected precursors. A commercial Fe–Cr based WGS catalyst was used for comparison. Catalysts were characterized using BET surface area measurements, temperature-programmed reduction (TPR) and X-ray fluorescence (XRF). According to the obtained results, the materials prepared with sulfate showed lower specific surface areas but they were more active than those obtained from chloride and the commercial one and there were three reduction peaks for all the samples in TPR results

کلیدواژه ها:

High-temperature water-gas shift reaction ، Fe-Cr-Cu catalysts ، magnetite-based catalysts ، co-precipitation ، CO conversion