Abstract
MnOx enhances the catalytic activity of Co during Fischer–Tropsch synthesis, increases selectivity toward C5+ products, and decreases methane formation. These desired traits are thought to result f...
Highlights
Fischer−Tropsch synthesis (FTS) is an alternative way to produce petroleum products for transporting fuel from nonpetroleum feedstock
Co is one of the best catalysts used in commercial FTS because of its superior activity, high selectivity toward diesel and wax, and low water−gas shift activity, despite its more expensive price compared to highly catalytic Fe.[4,5]
To determine the effect of Mn on CO adsorption on the common FTS catalyst Co, different amounts of Mn were deposited on Co foil
Summary
Fischer−Tropsch synthesis (FTS) is an alternative way to produce petroleum products for transporting fuel from nonpetroleum feedstock. We used ambient pressure X-ray photoelectron spectroscopy (APXPS) in the mbar pressure range to understand CO and H2 adsorption and co-adsorption trends on polycrystalline Co foil and effects of water (a byproduct of FTS) and typical impurities.[8] Despite still being four orders of magnitude lower than the desired pressure range used in industrial processes, such studies can help to understand the fundamental processes occurring on the catalyst surface during FTS. How MnOx promotes the activity is usually associated with the increase in CO adsorption energy on the surface.[13,15−17] To assess this claim, we here use a surface science approach by means of APXPS measurements of CO adsorption on MnOx-modified Co foil in the 10−6 to 1 mbar pressure range. We found that MnOx layers on Co promote the adsorption of both CO and OH, but OH more significantly
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