A Derivative of ZnIn2S4 Nanosheet Supported Pd Boosts Selective CO2 Hydrogenation

Abstract

AbstractCO2 hydrogenation to value‐added chemicals has been considered as a promising way to reduce CO2 emission and alleviate energy crisis. However, the high‐efficiency CO2 hydrogenation process is driven by the current drawbacks of low activity and/or selectivity. Herein, it is demonstrated that 2D S‐doped ZnInOx, which evolves from the calcination of ZnIn2S4 nanosheets (ZIS NSs), can serve as a functional support for Pd nanoparticles (NPs) to promote the selective CO2 hydrogenation to CH3OH. Detailed investigations show that ZnIn2S4 will evolve into In2O3 and amorphous S‐doped ZnO, on which Pd NPs are preferentially located due to the strong electrophilicity of S. Consequently, the strong interaction between Pd NPs and amorphous S‐doped ZnO prevents Pd NPs from sintering and facilitates the selective CO2 hydrogenation to produce CH3OH. The optimal catalyst shows a CO2 conversion of 12.7% with a CH3OH selectivity of 87.4% at 280 °C. This study provides a facile route to regulate catalytic supports and controllably load active species, which may attract great research interests in the fields of heterogeneous catalysis.