Unravelling the Promotional Effect of La₂O₃ in Pt/La‐TiO₂ Catalysts for CO₂ Hydrogenation

This work reports the preparation of a La 2 O 3 ‐modified Pt/TiO 2 (Pt/La‐TiO 2 ) hybrid through an excess‐solution impregnation method and its application for CO 2 hydrogenation catalysis. The Pt/La‐TiO 2 catalyst is characterized by XRD, H 2 temperature‐programmed reduction (TPR), TEM, X‐ray photoelectron spectroscopy (XPS), Raman, EPR, and N 2 sorption measurements. The Pt/La‐TiO 2 composite starts to catalyze the CO 2 conversion reaction at 220 °C, which is 30 °C lower than the Pt/TiO 2 catalyst. The generation of CH 4 and CO of Pt/La‐TiO 2 is 1.6 and 1.4 times greater than that of Pt/TiO 2 . The CO 2 temperature‐programmed desorption (TPD) analysis confirms the strengthened CO 2 adsorption on Pt/La‐TiO 2 . Moreover, the in situ FTIR experiments demonstrate that the enhanced CO 2 adsorption of Pt/La‐TiO 2 facilitates the formation of the active Pt–CO intermediate and subsequently boosts the evolution of CH 4 and CO. The cycling tests reveal that Pt/La‐TiO 2 shows reinforced stability for the CO 2 hydrogenation reaction because the La species can prevent Pt nanoparticles (NPs) from sintering. This work may provide some guidance on the development new rare‐metal‐modified hybrid catalysts for CO 2 fixation.