Repositori institucional URV
| URV's Author/s: | Cesteros Fernández, Yolanda / Granados Reyes, Judith Cecilia / RUEDA ALTAMAR, ANGIE CAROLYNE |
| Author, as appears in the article.: | Granados-Reyes, Judith; Rueda, Angie C; Cesteros, Yolanda |
| Author's mail: | yolanda.cesteros@urv.cat angiecarolyne.rueda@urv.cat angiecarolyne.rueda@urv.cat judithcecilia.granados@urv.cat |
| Author identifier: | 0000-0002-5439-9358 |
| Journal publication year: | 2024 |
| Publication Type: | Journal Publications |
| APA: | Granados-Reyes, Judith; Rueda, Angie C; Cesteros, Yolanda (2024). Synthesis of NiCuMgAl-layered double hydroxides using advanced microwave and ultrasound methods. Applied Clay Science, 261(), 107590-. DOI: 10.1016/j.clay.2024.107590 |
| Papper original source: | Applied Clay Science. 261 107590- |
| Abstract: | The effect of using ultrasound vs magnetic stirring, microwaves vs conventional heating, and autoclave vs refluxing on the synthesis of NiCuMgAl-layered double hydroxides (LDH) was widely studied. The use of ultrasounds during coprecipitation resulted in lower LDH crystallinity, difficulted the incorporation of the divalent cations in the layer and led to low specific surface area and low basicity. This could be attributed to smaller crystallization nuclei formed under ultrasound; that is, more efficient agitation due to cavitation phenomena, led to less crystal growth. The use of microwaves refluxing during the aging step instead of conventional heating resulted in higher crystallinity, allowing a better incorporation of the cations in the layer, obtaining higher specific surface area and higher amount of stronger basic sites. Interestingly, the use of autoclave at higher temperature (180 degrees C) but at shorter time (1 h) improved the crystallinity of the LDH samples, especially in the stacking direction and applying microwaves, favoring the incorporation of the cations in the layer. Autoclave under microwaves led to higher amount of basic sites but lower surface area than autoclave by conventional heating at the same conditions. This suggests that microwaves favored a better incorporation of the hydroxyl groups into the layers and/or the appearance of surface-defective sites. |
| Article's DOI: | 10.1016/j.clay.2024.107590 |
| Link to the original source: | https://www.sciencedirect.com/science/article/pii/S0169131724003387?via%3Dihub |
| Papper version: | info:eu-repo/semantics/publishedVersion |
| licence for use: | https://creativecommons.org/licenses/by/3.0/es/ |
| Department: | Química Física i Inorgànica |
| Licence document URL: | https://repositori.urv.cat/ca/proteccio-de-dades/ |
| Thematic Areas: | Antropologia / arqueologia Arquitetura e urbanismo Arquitetura, urbanismo e design Astronomia / física Biotecnología Chemistry, physical Ciência de alimentos Ciências agrárias i Ciências ambientais Ciências biológicas i Ciências biológicas ii Engenharias i Engenharias ii Engenharias iii Engenharias iv Farmacia Geochemistry and petrology Geociências Geografía Geology Interdisciplinar Materiais Materials science, multidisciplinary Medicina ii Medicina veterinaria Mineralogy Química Soil science Water science and technology |
| Keywords: | Autoclave Basicity properties C Efficient Fe Hydrotalcite Layered double hydroxides Microwaves Ni Nickel-catalysts Optimization Selective hydrogenation Surface propertie Surface properties Transesterification Ultrasound Water |
| Entity: | Universitat Rovira i Virgili |
| Record's date: | 2024-11-02 |
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