Steam Reforming of Ethanol Over Cobalt Catalyst Modified with Small Amount of Iron

Abstract

Steam reforming of ethanol was examined over Co/SrTiO 3 with addition of another metal-Pt, Pd, Rh, Cr, Cu, or Fe-for promotion of the catalytic activity. Ethanol conversion and H 2 yield were improved greatly by adding Fe or Rh at 823 K. Although Rh addition promoted CH 4 formation, Fe addition enhanced steam reforming of ethanol selectively. A suitable amount of Fe loading was in the window of 0.33-1.3 mol%. A comparative study of the reaction over a catalyst supported on SiO 2 was conducted, but no additional effect of Fe was observed on the Co/SiO 2 catalyst. High activity of Fe/Co/SrTiO 3 catalyst came from interaction among Fe, Co, and SrTiO 3 .

Steam reforming of ethanol over K promoted Co catalyst

“…(2)-(4) [12,15,18,21,23,25,26]. In addition, the methanation of CO is not a dominant reaction for methane formation over Cobased catalysts [25], which suggests that methane was formed as a by-product via the decomposition of acetaldehyde, as shown in Eq. (5).…”

“…is strongly desired. For suppressing coke and methane formation in ethanol steam reforming over Co-based catalyst, two solutions have been proposed: one is an addition of a second element [12,18,21,22,25,26,29]; another is changing catalytic support [22][23][24]30,31]. The Llorca group reported that Co/ZnO promoted with Fe, Mn, or Cr showed high activity for ethanol steam reforming, in which Co and these metals produced alloys [12,18,21].…”

Steam reforming of ethanol over Co3O4–Fe2O3 mixed oxides

“…Co-based catalysts have been actively researched for the process as less methane and more hydrogen is generated compared with Ni-based catalysts. However, the deactivation of Co-based catalysts as a result of sintering and/or carbon deposition over the catalyst surface has hindered the wider use of these catalysts for steam reforming reactions [4]. Consequently, most of the studies investigating cobalt catalysts for ethanol steam reforming have been in the area of improving their activity and, importantly, stability while concomitantly reducing the formation of undesired by-products, in particular coke.…”

Co-Fe-Si Aerogel Catalytic Honeycombs for Low Temperature Ethanol Steam Reforming

“…On the other hand, it has been demonstrated that alloying cobalt with more electronegative elements such as Ni or Cu results in worse catalytic performance in terms of hydrogen yield, whereas alloying cobalt with the less electronegative elements Fe [22,43,44] and Mn [35,37] promotes the redox pair Co 0 ↔Co 2+ , both in terms of a lower cobalt reduction temperature as well as a fast re-oxidation, which in turn results in a better catalytic stability. An important advantage of conducting the ESR at low temperature is that the WGS equilibrium favors the formation of hydrogen and CO 2 at the expense of CO and water (Equation 3), thus maximizing the production of H 2 and avoiding the requirement of additional WGS units at the reactor outlet.…”