CO ₂ hydrogenation over differently morphological CeO ₂ ‐supported Cu‐Ni catalysts

Abstract

Summary Differently morphological CeO2‐supported Cu‐Ni catalysts utilized for carbon dioxide hydrogenation to methanol were prepared by the method of impregnation. The 100‐ to 300‐nm CeO2 nanorod‐supported catalyst dominantly exposed low‐energy (100) and (110) facets, and the Cu‐Ni supported on 10‐ to 20‐nm CeO2 nanospheres and on irregular CeO2 nanoparticles were both enclosed by (111) facets owning high energy. Besides, all CeO2‐supported Cu‐Ni catalysts possess oxygen vacancies, which can active and absorb CO2 and is further beneficial for the reaction. Most oxygen vacancies were generated from the Ce4+ reduction to Ce3+ with the ceria lattice cell expansion, and small amount of oxygen vacancies resulted from the Ce4+ replacement by Cu or/and Ni atom. Because of the exposed (100) and (110) facets and numerous oxygen vacancies, well‐defined CeO2 nanorod‐supported Cu‐Ni alloy showed more superior catalytic performance than on CeO2 nanospheres and nanoparticles.

Recent Advances on the Rational Design of Non-Precious Metal Oxide Catalysts Exemplified by CuOx/CeO2 Binary System: Implications of Size, Shape and Electronic Effects on Intrinsic Reactivity and Metal-Support Interactions

“…The controlled synthesis of multicomponent systems could also be an effective approach for highly active and selective hydrogenation catalysts (e.g., [302][303][304][305]308]). For instance, the ternary composite consisting of Cu, ZnO, CeO x , supported on SBA-15 exhibited high catalytic activity for methanol synthesis (Table 5), due to the peculiar synergistic effects between the different counterparts [302].…”

“…In this perspective, bimetallic composites (Cu-Ni) incorporated into ceria nanoparticles of specific morphology (e.g., nanotubes, nanorods) could lead to highly active composites for the CO 2 hydrogenation to methanol ( Table 5). The enhanced catalytic performance of Cu-Ni/CeO 2 nanoshaped catalysts was mainly interpreted on the basis of the synergistic interaction between Cu and Ni as well as of that between the ceria carrier and Cu-Ni alloy [304,305]. Similarly, the bimetallic Cu-Fe/CeO 2 catalyst has shown enhanced stability in the high-temperature RWGS due mainly to the fact that iron oxide clusters (FeO x ) highly dispersed over ceria act as textural promoters [308].…”

NiSFeS/N, S co‐doped carbon hybrid: Synergistic effect between NiS and FeS facilitating electrochemical oxygen evolution reaction

“…In NiS/NSC, there are peaks of Ni 2+ 2p 3/2 (852.6 eV) and 2p 1/2 (870.0 eV) in NiS, and peaks of Ni 3+ 2p 3/2 (855.1 eV) and 2p 1/2 (873.5 eV), which can be due to NiS being oxidized when exposed to air. The peaks at ~860.9 and ~879.1 eV are satellite peaks 24 . In Ni60Fe40S/NSC, there are also Ni 2+ , Ni 3+ , and satellite peaks.…”

Engineering well-defined rare earth oxide-based nanostructures for catalyzing C1 chemical reactions

“…The selective hydrogenation of CO 2 to methanol has attracted increasing attention in recent years because methanol is an important basic chemical in many chemical industries. [99][100][101][102] Chen et al 103 , selectivity = 68%) (Fig. 17b).…”