High selectivity to hydrogen on the methane decomposition over Rh/γ-Al2O3–Nd2O3 catalysts

Recent developments in methane decomposition over heterogeneous catalysts: an overview

“…The stability test is conducted over 60% Fe/Al 2 O 3 . The result showed that no deactivation is observed after 4 h [113] of reaction. The nature of the Fe oxide precursor from which the catalytic active site is generated via reduction strongly influences catalytic stability and hydrogen yields [139].…”

“…The highest activity achieved by Pd/AC catalyst in a prior study with 50 mol% of methane conversion for 4 h on stream at a reaction temperature of 850 °C is attributed to the effectively distributed metallic Pd particles on the AC support [134]. Caballero et al [113] studied the Rh catalyst supported by γ-Al 2 O 3 prepared through wet impregnation for methane decomposition with the addition of Nd 2 O 3 as a support modifier. The results revealed the methane conversion of the modified catalyst is higher than that of 1 wt% Rh/γ-Al 2 O 3 catalyst attributed to the stronger interaction between Rh and γ-Al 2 O 3 -Nd 2 O 3 catalyst support as confirmed through TPR and X-ray photoelectron spectroscopy (XPS) analyses.…”

“…Fig. 8 Representation of the behavior of methane decomposition on Rh metallic particles for a Rh/Al 2 O 3 and b Rh/Al 2 O 3 -10 wt% Nd 2 O 3 catalysts[113] …”

Correlation of Rh Particle Size with CO Chemisorption: Effect on the Catalytic Oxidation of MTBE

“…Therefore, the Rh particle size and dispersion on the support are important factors, affecting the type of CO chemisorption. Other researchers have also reported that thermal treatments at 500 • C improve Rh dispersion, favoring the gem-dicarbonyl interaction [16,17]. Additionally, Samolia et al [18] found that Rh catalysts, treated at 300 • C, have linear interactions with carbon monoxide.…”

“…The researchers suggest that the increase in catalytic performance observed is due to changes in the catalyst's ability for CO adsorption, CO insertion, H 2 dissociation, hydrogenation, etc., which are mainly controlled by the states of Rh. In addition, Caballero et al [16], synthesized Rh/γ-Al 2 O 3 -Nd 2 O 3 catalysts for the hydrogen production reaction from methane. In this study, they mentioned that the 2CO-Rh + interaction is associated with small, well-dispersed rhodium crystals on the surface of the support.…”