CHARACTERIZATION OF CeO2 DOPED MgAl2O4 PREPARED BY THE CHELATING AGENTS-ASSISTED IMPREGNATION METHOD
| Autor: | Mariana Noelia Barroso, Alejandra C. Villagran-Olivares, M.C. Abello |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_element
INGENIERÍAS Y TECNOLOGÍAS ceria impregnation 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences Catalysis lcsh:Chemistry chemistry.chemical_compound Chelation CeO2-MgAl2O4 Spinel Thermal decomposition Nitrilotriacetic acid General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Ingeniería Química Cerium nitrate purl.org/becyt/ford/2.4 [https] Cerium lcsh:QD1-999 purl.org/becyt/ford/2 [https] chemistry Otras Ingeniería Química chelating agents engineering surface properties 0210 nano-technology Citric acid chemical synthesis Nuclear chemistry |
| Zdroj: | Química Nova v.41 n.8 2018 Química Nova Sociedade Brasileira de Química (SBQ) instacron:SBQ CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET Química Nova, Vol 41, Iss 8, Pp 899-904 Química Nova, Volume: 41, Issue: 8, Pages: 899-904, Published: AUG 2018 |
| ISSN: | 0100-4042 |
| DOI: | 10.21577/0100-4042.20170265 |
| Popis: | MgAl2O4 spinel employed as support of reforming catalysts was doped by CeO2. The samples were prepared by wet impregnation from aqueous solutions of cerium nitrate, with and without chelating agents. The chelating agents used were ethylenediamine-tetraacetic acid (EDTA), nitrilotriacetic acid (NTA) and citric acid (CA) at different pH of impregnation. The solids were characterized by TG, XRD, SBET, TPR, SEM-EDX and CO2−TPD. Nanoparticles of CeO2 between 5 and 6.8 nm were obtained by the thermal decomposition in air at 600 °C. The surface cerium reduction occurred in a wide temperature range of 450° to 670 °C. The use of citric acid at pH= 8 led to the lowest crystallite size of CeO2 and the lowest interaction with the spinel. The H2 consumption and extent of CeO2-support interaction did not show a clear dependence with the CeO2 crystallite sizes. The use of chelating agents in the impregnation step did not modify the total basicity. Slight changes in the strength of weak basic sites were observed. Fil: Villagran Olivares, Alejandra Catalina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Investigaciones en Tecnología Química. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Instituto de Investigaciones en Tecnología Química; Argentina Fil: Barroso, Mariana Noelia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Investigaciones en Tecnología Química. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Instituto de Investigaciones en Tecnología Química; Argentina Fil: Abello, Maria Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Investigaciones en Tecnología Química. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Instituto de Investigaciones en Tecnología Química; Argentina |
| Databáze: | OpenAIRE |
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