Articles producció científica> Química Física i Inorgànica

Assessment through FT-IR of surface acidity and basicity of hydrocalumites by nitrile adsorption

  • Identification data

    Identifier: imarina:5874085
    Authors:
    Granados-Reyes JSalagre PCesteros YBusca GFinocchio E
    Abstract:
    © 2019 Elsevier B.V. Acidity and basicity of four hydrocalumite-type materials were studied by infrared spectroscopy through the adsorption of pivalonitrile and acetonitrile, as probe molecules. Samples were prepared by coprecipitation of the corresponding chloride salts with and without ultrasounds and later aging by refluxing under microwaves or by conventional heating. After pivalonitrile adsorption, the samples outgassed at room temperature showed very weak acidity. The number of Lewis acid sites increased after activation at 100 °C, and stronger Lewis acid sites were detected after outgassing at 400 °C. Moreover, these samples showed strong basicity due to the O2– anions, as evidenced by the formation of (CH2CN)− anions after acetonitrile adsorption at high temperature. Additionally, coprecipitation under ultrasounds seems to enhance the basicity of the resulting hydrocalumite. This could explain the higher activity observed for the sample synthesized under ultrasounds when tested as catalyst for the transesterification of glycerol with dimethylcarbonate.
  • Others:

    Author, as appears in the article.: Granados-Reyes J; Salagre P; Cesteros Y; Busca G; Finocchio E
    Department: Química Física i Inorgànica
    URV's Author/s: Cesteros Fernández, Yolanda / Salagre Carnero, María Pilar
    Keywords: Zeolites Transesterification Spectroscopy Probe Pivalonitrile adsorption Ni Layered double hydroxides Hydrocalumite Glycerol Ft ir spectroscopy Catalysts Base properties Acetonitrile adsorption
    Abstract: © 2019 Elsevier B.V. Acidity and basicity of four hydrocalumite-type materials were studied by infrared spectroscopy through the adsorption of pivalonitrile and acetonitrile, as probe molecules. Samples were prepared by coprecipitation of the corresponding chloride salts with and without ultrasounds and later aging by refluxing under microwaves or by conventional heating. After pivalonitrile adsorption, the samples outgassed at room temperature showed very weak acidity. The number of Lewis acid sites increased after activation at 100 °C, and stronger Lewis acid sites were detected after outgassing at 400 °C. Moreover, these samples showed strong basicity due to the O2– anions, as evidenced by the formation of (CH2CN)− anions after acetonitrile adsorption at high temperature. Additionally, coprecipitation under ultrasounds seems to enhance the basicity of the resulting hydrocalumite. This could explain the higher activity observed for the sample synthesized under ultrasounds when tested as catalyst for the transesterification of glycerol with dimethylcarbonate.
    Thematic Areas: Water science and technology Soil science Química Mineralogy Medicina veterinaria Medicina ii Materials science, multidisciplinary Materiais Interdisciplinar Geology Geografía Geociências Geochemistry and petrology Farmacia Engenharias iv Engenharias iii Engenharias ii Engenharias i Ciências biológicas ii Ciências biológicas i Ciências ambientais Ciências agrárias i Ciência de alimentos Chemistry, physical Biotecnología Astronomia / física Arquitetura, urbanismo e design Arquitetura e urbanismo Antropologia / arqueologia
    licence for use: https://creativecommons.org/licenses/by/3.0/es/
    ISSN: 01691317
    Author's mail: pilar.salagre@urv.cat yolanda.cesteros@urv.cat
    Author identifier: 0000-0003-3257-2022 0000-0002-5439-9358
    Record's date: 2023-07-31
    Papper version: info:eu-repo/semantics/acceptedVersion
    Link to the original source: https://www.sciencedirect.com/science/article/abs/pii/S0169131719302388?via%3Dihub
    Papper original source: Applied Clay Science. 180 (105180):
    APA: Granados-Reyes J; Salagre P; Cesteros Y; Busca G; Finocchio E (2019). Assessment through FT-IR of surface acidity and basicity of hydrocalumites by nitrile adsorption. Applied Clay Science, 180(105180), -. DOI: 10.1016/j.clay.2019.105180
    Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
    Article's DOI: 10.1016/j.clay.2019.105180
    Entity: Universitat Rovira i Virgili
    Journal publication year: 2019
    Publication Type: Journal Publications
  • Keywords:

    Chemistry, Physical,Geochemistry and Petrology,Geology,Materials Science, Multidisciplinary,Mineralogy,Soil Science,Water Science and Technology
    Zeolites
    Transesterification
    Spectroscopy
    Probe
    Pivalonitrile adsorption
    Ni
    Layered double hydroxides
    Hydrocalumite
    Glycerol
    Ft ir spectroscopy
    Catalysts
    Base properties
    Acetonitrile adsorption
    Water science and technology
    Soil science
    Química
    Mineralogy
    Medicina veterinaria
    Medicina ii
    Materials science, multidisciplinary
    Materiais
    Interdisciplinar
    Geology
    Geografía
    Geociências
    Geochemistry and petrology
    Farmacia
    Engenharias iv
    Engenharias iii
    Engenharias ii
    Engenharias i
    Ciências biológicas ii
    Ciências biológicas i
    Ciências ambientais
    Ciências agrárias i
    Ciência de alimentos
    Chemistry, physical
    Biotecnología
    Astronomia / física
    Arquitetura, urbanismo e design
    Arquitetura e urbanismo
    Antropologia / arqueologia
  • Documents:

  • Cerca a google

    Search to google scholar