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

Abstract

This work reports the preparation of a La2O3‐modified Pt/TiO2 (Pt/La‐TiO2) hybrid through an excess‐solution impregnation method and its application for CO2 hydrogenation catalysis. The Pt/La‐TiO2 catalyst is characterized by XRD, H2 temperature‐programmed reduction (TPR), TEM, X‐ray photoelectron spectroscopy (XPS), Raman, EPR, and N2 sorption measurements. The Pt/La‐TiO2 composite starts to catalyze the CO2 conversion reaction at 220 °C, which is 30 °C lower than the Pt/TiO2 catalyst. The generation of CH4 and CO of Pt/La‐TiO2 is 1.6 and 1.4 times greater than that of Pt/TiO2. The CO2 temperature‐programmed desorption (TPD) analysis confirms the strengthened CO2 adsorption on Pt/La‐TiO2. Moreover, the in situ FTIR experiments demonstrate that the enhanced CO2 adsorption of Pt/La‐TiO2 facilitates the formation of the active Pt–CO intermediate and subsequently boosts the evolution of CH4 and CO. The cycling tests reveal that Pt/La‐TiO2 shows reinforced stability for the CO2 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 CO2 fixation.

Boosted photocatalytic conversion of CO2 into solar fuel through photo-magnetic coupling

“…The desorption peak of 0.1% NiO/TiO2 catalyst was more considerable than that of TiO2 (P25), and the desorption temperature was increased by 15°C at the same time. This enhancement is contributed by the surface NiO, which increases the binding between CO2 and the catalyst and benefits to CO2 hydrogenation 50 . Another peak centered at 475°C also belonged to b-CO32−, which might due to the interaction of CO2 and TiO2 on the surface of the catalyst.…”

“…This enhancement is contributed by the surface NiO, which increases the binding between CO 2 and the catalyst and benefits to CO 2 hydrogenation. 50 Another peak centered at 475°C also belonged to b-CO 3 2− , which might due to the interaction of CO 2 and TiO 2 on the surface of the catalyst.…”

Thermocatalytic CO2conversion by siliceous matter: a review

“…, Ce, La, Y, Eu, Gd, and Er), group 3A metals ( e.g. , Al, In, and Ga), 83,127–132 and transition metals ( e.g. , Cu, Zn, Ni, Fe, and Co) 91,133–138 has been found to be active for the conversion of CO 2 toward different products.…”

Enhancing Kinetics of Carbonyl Sulfide Hydrolysis Using Pt-Supported Al2O3 Catalysts: First-Principles-Informed Energetic Span Analysis

“…Interestingly, our previous study found that Al 2 O 3 catalysts alone can offer 100% conversion of COS with better stability where it can withhold the conversion of 50% up to 7 h Adding transition metals, such as Ni, Au, Pd, and Pt, is expected to enhance the catalytic performance since these metals normally facilitate hydrogenation − and C–S bond breaking. − In particular, Pt has been recognized as one of the most efficient catalysts for selective hydrogenation, − , CO oxidation, and C–S bond activation . Such properties could hasten kinetics of COS hydrolysis.…”