The effect of the absence of Ni, Co, and Ni–Co catalyst pretreatment on catalytic activity for hydrogen production via oxidative steam reforming of ethanol

The reducibility of highly stable Ni-containing species in catalysts derived from hydrotalcite-type precursors

“…The most common approach involved the replacement of Ni 2+ by Mg 2+ , obtaining Ni/Mg/Al-CO 3 precursors, as suggested by some of us. 10,24 Noble metals, 25 Fe, 20,26 or Co 27 were also introduced into brucite-type layers to obtain bimetallic particles. Moreover, La, Ce, Pr, and Ca can be added to the formulation.…”

Improved stability of Ni/Al2O3 catalysts by effect of promoters (La2O3, CeO2) for ethanol steam-reforming reaction

“…Nevertheless, the use of Al 2 O 3 as support promotes catalysts deactivation by deposition of carbon from ethylene intermediate produced via dehydration reactions of ethanol on acid sites of the support. Taking into account the deactivation process, due to carbon deposition on the catalysts surface during the SRE reaction, oxidative steam reforming (OSR) is an effective route for producing hydrogen from ethanol because it can attenuate coke deposition [20][21][22][23]. The major drawback of OSR is decrease the yield of H 2 due to its oxidation.…”

Hydrogen‐rich syngas production from chemical looping steam reforming of bio‐oil model compound: Effect of bimetal on LaNi 0.8 M 0.2 O 3 (M = Fe, Co, Cu, and Mn)

“…The LNCo lattice plane distance was decreased when the Co 3+ replaces Ni 3+ , resulting in peak shifting . The peak position shifts to the right when smaller ions were doped into the lattice . Similarly, the Fe 3+ , Mn 3+ , and Cu 3+ (radius 0.0550, 0.0580, and 0.0540 nm, respectively) peaks also transfer to higher for analysis.…”

“…43 The peak position shifts to the right when smaller ions were doped into the lattice. 44 Similarly, the Fe 3+ , Mn 3+ , and Cu 3+ (radius 0.0550, 0.0580, and 0.0540 nm, respectively) peaks also transfer to higher for analysis. The LN, LNFe, LNCo, LNMn, and LNCu were reduced at steam/carbon mole ratio 2:1, GHSV = 34 736 g of feed/ (g catalyst h), and 2.5 hours.…”