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
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/
Entity: Universitat Rovira i Virgili
Journal publication year: 2019
Publication Type: Journal Publications
Repositori URV