Effect of support oxygen storage capacity on the catalytic performance of Rh nanoparticles for CO2 reforming of methane

Abstract

Highlights  High OSCs' oxide supports promote CO-enriched syngas production of Rh-catalysed DRM  Low carbon deposition was revealed, increasing in the order Rh/CZ<Rh/ACZ<Rh/γ-Al2O3  O 2back-spillover from CZ to Rh particles determines Rh state and its DRM activity  100% Rh 0 active phase on Rh/CZ and only 55% Rh/Al2O3 were found after DRM  Reduced apparent activation energy for Rh/CZ indicates a promising LT-DRM material

The Role of Alkali and Alkaline Earth Metals in the CO2 Methanation Reaction and the Combined Capture and Methanation of CO2

“…CeO 2 has a high oxygen storage capacity (OSC) that, together with its redox properties due to the Ce 4+ /Ce 3+ redox couple, promotes the stability of the active metal particles and suppresses the formation of coke. Furthermore, CeO 2 facilitates a strong interaction with the supported metal phase [54,55]. Liu et al [30] conducted a comprehensive study, where they doped the CeO 2 support of Ni/CeO 2 catalysts with various alkaline earth metals, with the aim to further enhance their low-temperature catalytic activity.…”

Recent Developments in the Modelling of Heterogeneous Catalysts for CO2 Conversion to Chemicals

“…CO 2 methanation can reach 99 % CH 4 selectivity through the use of appropriate catalysts, avoiding the subsequent product separation and overcoming the difficulty of dispersed product distribution. [19] The most studied noble and nonnoble metalbased catalysts for CO 2 methanation are Ni, [100][101][102] Ru, [103][104][105] Rh, [106,107] Pd, [108,109] Co, [110,111] Fe, [112,113] Cu, [114,115] Pt, [116] Ag [39] and Au [39] catalysts from which the most important role to methanation process has Ru, Fe, Ni, and Co. [39,117] According to the various studies the activity performance and selectivity of different metal-based catalysts decreases in the following order: [118] Ni and Ru are reported to have maximum activity and stability. [119] Ni based catalysts are very effective due to the presence of easily transferable electrons in the frontier d orbitals and therefore are the most efficient and active catalytic system together with alumina as a support that may be applied on industrial scale.…”

Combining Exsolution and Infiltration for Redox, Low Temperature CH4 Conversion to Syngas

“…Using the microstructures that produce the more selective, stable and coke free materials (cP-Ni and pP-Ni), we decided to use a complementary strategy in order to functionalise the surface of these exo/endo-particle systems, aiming at low temperature methane conversion. We did so by infiltrating very small amounts of noble metals because of their ability to increase the effective oxygen capacity and exchange of supports, and herein, we chose Rh as it is readily reducible and highly effective for methane conversion [24][25][26][27][28][29]. After the perovskites had been reduced, 0.1 wt.% of Rh was infiltrated, and as such, they were already decorated with exsolved particles both on the surface and in the bulk.…”