CO₂ Hydrogenation over Oxide‐Supported PtCo Catalysts: The Role of the Oxide Support in Determining the Product Selectivity

Abstract

By simply changing the oxide support, the selectivity of a metal-oxide catalysts can be tuned. For the CO2 hydrogenation over PtCo bimetallic catalysts supported on different reducible oxides (CeO2 , ZrO2 , and TiO2 ), replacing a TiO2 support by CeO2 or ZrO2 selectively strengthens the binding of C,O-bound and O-bound species at the PtCo-oxide interface, leading to a different product selectivity. These results reveal mechanistic insights into how the catalytic performance of metal-oxide catalysts can be fine-tuned.

Operando Spectroscopic Evidence of the Induced Effect of Residual Species in the Reaction Intermediates during CO2 Hydrogenation over Ruthenium Nanoparticles

“…In this case, the IR spectra exhibit the evolution of three new bands at 1384, 1610 and 2805 cm −1 which correspond to the δ(CH), ν(CO) and ν(CH) vibration modes, respectively, tentatively ascribed to the formation of hydroxymethylene (*HOCO) and formyl (*H x CO) species as reaction intermediates . These species are formed directly on the metal surface or in the metal‐support interfacial region and the C−O bond scission leads to the formation of CH x species that are subsequently hydrogenated to form CH 4 . As described in greater detail in the supporting information, boron species are linked to the alumina surface through reaction with the basic hydroxyl groups forming BO 3 /BO 4 units that completely neutralize the hydroxyls on the alumina surface.…”

Pd Nanoparticles Supported on Triangle‐Shaped La2O2CO3 Nanosheets: A New Highly Efficient and Durable Catalyst for Selective Hydrogenation of Cinnamaldehyde to Hydrocinnamaldehyde

“…as supports. The role of oxide supports is mainly immobilization of the active component and improvement of the metal dispersion and surface area . In recent years, many reports have shown that the catalytic activity of supported metal catalysts can be adjusted by means of the particle size, shape, and composition of the material .…”

Tuning the Selectivity of Catalytic Carbon Dioxide Hydrogenation over Iridium/Cerium Oxide Catalysts with a Strong Metal–Support Interaction

“…Indeed, the modification of the chemical state,f or instance the oxidation state [7] of the metal catalyst, could influence the adsorption behavior of the reactants and the subsequent conversion of the reaction intermediates,and thus the reaction path. [9] Herein, aone-step ligand-free method based on adsorption-precipitation is developed to synthesize highly dispersed Ir NPs deposited on CeO 2 nanoplatelets.T he size of iridium (Ir) species can be controlled below 2.5 nm even at very high Ir loading (20 wt %). [8] On the other hand, it has been revealed that the support can influence the chemical state of noble metal NPs in amanner other than simply acting as asubstrate upon which loaded metals are dispersed.…”