Elucidating the role of earth alkaline doping in perovskite-based methane dry reforming catalysts

Abstract

To elucidate the role of earth alkaline doping in perovskite-based dry reforming of methane (DRM) catalysts, we embarked on a comparative and exemplary study of a Ni-based Sm perovskite with...

Metal–Perovskite Interfacial Engineering to Boost Activity in Heterogeneous Catalysis

“…Sr-doped samarium nickelate structures were also studied by Nezhad et al in dry reforming of methane to reveal the role of earth-alkaline doping. It was found, that despite the often-reported beneficial role of the earth-alkaline metal in DRM catalysis, the detrimental role manifests itself in the sole formation of a SrCO 3 phase and a generally destabilized Ni/Sm 2 O 3 interface with pronounced Ni particle sintering [34]. The intermediate formation of La 2 NiO 4 during DRM has also been observed by Batiot-Dupeyrat et al at 700 • C. At higher reaction temperatures of 800 • C, La 2 NiO 4 vanished in favor of full decomposition.…”

“…Ni particles obtained from La 2 NiO 4 decomposition, in contact with La 2 O 3 , are much less prone to carbon decomposition, owing to the efficient carbon reactivity at the Ni-La 2 O 3 interface (Figure 1B) [17]. The effect of Cu-, Fe-and Ru-doping is also known to reduce the formation of coke, alongside steering the Ni crystallite size, the chemical composition of the exsolved Ni by Cu and Fe co-alloying and the reactivity of the oxy-carbonate structures [12,[18][19][20]23,25,27,29,31,34,35]. Das et al reported differences in the mechanistic pathway, switching between a La-oxy-carbonate-dominated pathway over Ni-La 2 O 3 interfaces to an oxygen-vacancy-dominated pathway over a NiFe-La 2 O 3 interface-both obtained via hydrogen reduction of La 0.9 Sr 0.1 NiO 3 and La 0.9 Sr 0.1 Ni 0.5 Fe 0.5 O 3 , respectively (Figure 1C) [18].…”

Resolving a structural issue in cerium-nickel-based oxide: a single compound or a two-phase system?

“…LnNiO 3 compounds (Ln – lanthanide cation) have already been investigated for different purposes, including electrocatalysis, 1 energy storage, 2,3 heterogeneous catalysis, 4,5 artificial intelligence, 6 gas sensing, 2 etc . Their metal-to-insulator transition has also been widely inspected.…”

Porous Silicon Oxycarbonitride Ceramics with Palladium and Pd2Si Nanoparticles for Dry Reforming of Methane

“…Many efforts have focused on looking for metal catalysts with high-catalytic performances towards this reaction and high resistance to carbon deposition, thus displaying long-term stability. Excellent catalytic performance can be reached using Ni-based catalysts, such as LaNiO 3 [38,39], La 2 NiO 4 [40,41], Sm 1.5 Sr 0.5 NiO 4 [42], Ni/MnO [43,44] catalyst with long-term stability at 800 • C are reported. However, the successful industrial application of these catalysts has been limited by the requirement of high reaction temperatures to obtain an acceptable level of conversion, causing serious catalyst deactivation problems due to carbon deposition and metal sintering at high temperatures.…”