Ethanol steam reforming and water gas shift over Co/ZnO catalytic honeycombs doped with Fe, Ni, Cu, Cr and Na

Ethanol steam reforming over rhodium and cobalt-based catalysts: Effect of the support

“…This suggests that the main route of methane production must be from the reactions of acetaldehyde [16]. A previous study [16] has shown that the basic sites catalyze ethanol dehydrogenation to produce acetaldehyde. Additionally, during ethanol steam reforming, acetaldehyde can react by decarbonylation (Eq.…”

“…It was noted by several authors [13e17] that the addition of promoters is very effective in improving the performance of catalysts for ethanol steam reforming. Promoters with alkaline properties, such as lithium, sodium, potassium, magnesium, lanthanum and cerium have been added to the catalysts with the primary purpose of inhibiting the deposition of coke during the reforming process, especially on nickel, copper and cobalt-based catalysts [15,16]. However it was observed, in some cases, that other properties were also improved, such as the decrease of reduction temperature and the increase of metallic dispersion.…”

Kinetic Modelling at the Basis of Process Simulation for Heterogeneous Catalytic Process Design

“…Since the data on the operative performance of the two different reactors are found elsewhere (see references addressed in the cited work), the interest of this simulation lies mainly in the fact that the electrical process required a simpler configuration, since the heat-exchange network and the preheating were not needed. 33 28…”

“…In fact, since equilibrium conditions depend on the temperature (most of the test reactors works with negligible pressure drops), when the full conversion of the precursor is achieved then the possible byproducts reveal that a certain path is kinetically forbidden (or enhanced), and if the ratios of H2O, CO, CO2, H2 and CH4 differ from the thermodynamically expected ones then even equilibrating reactions are kinetically delayed. Therefore, the study of reforming mixtures as a function of the reaction temperature can show if a material is always active towards any reaction path until the ultimate equilibrium or, on the other side, if the activation barriers between each reaction are appreciably different (for this kind of analysis, see for example the above cited papers and [32][33][34]). …”

Advances in Ethanol Reforming for the Production of Hydrogen

“…46 Although, Cu can be inactive in the SRE because it promotes dehydrogenation of ethanol to acetaldehyde, studies have shown that Cu is more reducible than Ni and Co. 45 The latter has been studied in catalysts doped with Fe, Ni, Cu, Cr, and Na. Casanova et al 47 found that with incorporation of Cu in a Co/ZnO catalyst, ethanol dehydrogenation increases; however, it inhibits the capacity for subsequent dehydrogenation. High quantities of Co favor the reaction because of its ability to participate in redox mechanisms.…”