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Improving the Stability of CeO2Catalyst by Rare Earth Metal Promotion and Molecular Insights in the Dimethyl Carbonate Synthesis from CO2and Methanol with 2-Cyanopyridine

  • Dades identificatives

    Identificador: imarina:4090799
    Autors:
    Stoian DMedina FUrakawa A
    Resum:
    © 2018 American Chemical Society. The unmatched efficiency of the direct dimethyl carbonate (DMC) synthesis from CO2and methanol over CeO2catalysts in the presence of an organic dehydrating agent (2-cyanopyridine, 2-CP) was recently reported with high DMC yield (>90%) in both batch and continuous operations. However, the CeO2catalyst gradually deactivates in the time scale of days due to suggested surface poisoning by 2-picolinamide (2-PA) produced by hydration of 2-CP. This work seeks active and stable CeO2-based catalysts and aims to understand the material factors influencing the catalytic performance. Surface modification of CeO2by the addition of rare earth metal (REM) was found to be effective for improving the catalyst stability. Surface basicity and reducibility of the Ce4+species play important roles in preventing catalyst deactivation by stabilizing the reactive methoxy species in comparison to the poisoning species (2-PA or species alike). This has been evidenced by in situ attenuated total reflection infrared spectroscopy. CeO2materials promoted with 1 wt % rare earth metals (La, Gd, and Pr) greatly enhanced the catalyst stability while retaining the high catalytic activity of CeO2. Among them, 1 wt % Pr promotion to CeO2was the most effective, affording 35% higher DMC yield in comparison to that of bare CeO2after 150 h on stream under the optimized reaction conditions of 30 bar and 120 °C.
  • Altres:

    Autor segons l'article: Stoian D; Medina F; Urakawa A
    Departament: Enginyeria Química
    Autor/s de la URV: Medina Cabello, Francisco / STOIAN, DRAGOS CONSTANTIN
    Paraules clau: Surface properties Rare earth metal Methanol In situ atr-ir Dimethyl carbonate Cerium oxide Carbon dioxide 2-cyanopyridine
    Resum: © 2018 American Chemical Society. The unmatched efficiency of the direct dimethyl carbonate (DMC) synthesis from CO2and methanol over CeO2catalysts in the presence of an organic dehydrating agent (2-cyanopyridine, 2-CP) was recently reported with high DMC yield (>90%) in both batch and continuous operations. However, the CeO2catalyst gradually deactivates in the time scale of days due to suggested surface poisoning by 2-picolinamide (2-PA) produced by hydration of 2-CP. This work seeks active and stable CeO2-based catalysts and aims to understand the material factors influencing the catalytic performance. Surface modification of CeO2by the addition of rare earth metal (REM) was found to be effective for improving the catalyst stability. Surface basicity and reducibility of the Ce4+species play important roles in preventing catalyst deactivation by stabilizing the reactive methoxy species in comparison to the poisoning species (2-PA or species alike). This has been evidenced by in situ attenuated total reflection infrared spectroscopy. CeO2materials promoted with 1 wt % rare earth metals (La, Gd, and Pr) greatly enhanced the catalyst stability while retaining the high catalytic activity of CeO2. Among them, 1 wt % Pr promotion to CeO2was the most effective, affording 35% higher DMC yield in comparison to that of bare CeO2after 150 h on stream under the optimized reaction conditions of 30 bar and 120 °C.
    Àrees temàtiques: Química Materiais Interdisciplinar General chemistry Engenharias ii Ciências agrárias i Chemistry, physical Chemistry (miscellaneous) Chemistry (all) Catalysis Astronomia / física
    Accès a la llicència d'ús: https://creativecommons.org/licenses/by/3.0/es/
    ISSN: 21555435
    Adreça de correu electrònic de l'autor: francesc.medina@urv.cat
    Identificador de l'autor: 0000-0002-3111-1542
    Data d'alta del registre: 2024-09-07
    Versió de l'article dipositat: info:eu-repo/semantics/acceptedVersion
    Enllaç font original: https://pubs.acs.org/doi/abs/10.1021/acscatal.7b04198
    URL Document de llicència: https://repositori.urv.cat/ca/proteccio-de-dades/
    Referència a l'article segons font original: Acs Catalysis. 8 (4): 3181-3193
    Referència de l'ítem segons les normes APA: Stoian D; Medina F; Urakawa A (2018). Improving the Stability of CeO2Catalyst by Rare Earth Metal Promotion and Molecular Insights in the Dimethyl Carbonate Synthesis from CO2and Methanol with 2-Cyanopyridine. Acs Catalysis, 8(4), 3181-3193. DOI: 10.1021/acscatal.7b04198
    DOI de l'article: 10.1021/acscatal.7b04198
    Entitat: Universitat Rovira i Virgili
    Any de publicació de la revista: 2018
    Tipus de publicació: Journal Publications
  • Paraules clau:

    Catalysis,Chemistry (Miscellaneous),Chemistry, Physical
    Surface properties
    Rare earth metal
    Methanol
    In situ atr-ir
    Dimethyl carbonate
    Cerium oxide
    Carbon dioxide
    2-cyanopyridine
    Química
    Materiais
    Interdisciplinar
    General chemistry
    Engenharias ii
    Ciências agrárias i
    Chemistry, physical
    Chemistry (miscellaneous)
    Chemistry (all)
    Catalysis
    Astronomia / física
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