Effect of the Sr substitution in the A-site for La1-xSrxCoO3 perovskite catalysts for the valorization of levulinic acid to produce gamma-valerolactone

IF 5.2 2区化学 Q1 CHEMISTRY, APPLIED Catalysis Today Pub Date : 2025-01-27 DOI:10.1016/j.cattod.2025.115210

Dana Arias , Alejandro Karelovic , Catherine Sepulveda , Gina Pecchi , Carla Herrera

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Abstract

A series of substituted La_1-xSr_xCoO₃ perovskites, with X_Sr = 0.0, 0.05, 0.1, 0.2 were used as catalysts in the liquid hydrogenation of levulinic acid at 250 °C and 5.0 MPa of H₂. The solids were analyzed by elemental chemical analysis, XRD, H₂-TPR, N₂ physisorption at 77 K, NH₃-TPD, and XPS. The catalytic activity increased as Sr-substitution increased up to 10 % of Sr. A further increase in Sr-substitution produces a significant decrease in LA conversion. The higher catalytic activity correlated with the highest amount of Co²⁺ species, whereas the further reduction of the catalytic activity was attributed to segregated phases. Furthermore, it was found that Sr substitution in the A-site changes the reaction mechanism for forming the main reaction product gamma-valerolactone, demonstrating that the substitution of La³⁺ by Sr²⁺ modifies the Co³⁺/Co²⁺ ratio redox pair.

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来源期刊

Catalysis Today 化学-工程：化工

CiteScore

11.50

自引率

3.80%

发文量

573

审稿时长

2.9 months

期刊介绍： Catalysis Today focuses on the rapid publication of original invited papers devoted to currently important topics in catalysis and related subjects. The journal only publishes special issues (Proposing a Catalysis Today Special Issue), each of which is supervised by Guest Editors who recruit individual papers and oversee the peer review process. Catalysis Today offers researchers in the field of catalysis in-depth overviews of topical issues. Both fundamental and applied aspects of catalysis are covered. Subjects such as catalysis of immobilized organometallic and biocatalytic systems are welcome. Subjects related to catalysis such as experimental techniques, adsorption, process technology, synthesis, in situ characterization, computational, theoretical modeling, imaging and others are included if there is a clear relationship to catalysis.