Synthesis, Characterization and Catalytic Evaluation of Cobalt and Niobium Oxide Solids Modified with Alkaline Earth Metals
| Autor: | Luciene Santos Carvalho, André Rosa Martins, Simone Pereira de Lima, Maiana Pinheiro Sena, Adriana Daniela Ballarini, Doris Ruiz |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
inorganic chemicals
XRD alkaline earth metals Niobium General Physics and Astronomy chemistry.chemical_element TPR 02 engineering and technology COBALT NIOBATE ALKALINE EARTH METALS 010402 general chemistry 01 natural sciences Catalysis Metal chemistry.chemical_compound cyclohexane dehydrogenation Niobium oxide General Materials Science Dehydrogenation Alkaline earth metal Chemistry General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences purl.org/becyt/ford/2.4 [https] Ammonium hydroxide purl.org/becyt/ford/2 [https] visual_art visual_art.visual_art_medium cobalt niobate 0210 nano-technology Cobalt Nuclear chemistry |
| Zdroj: | Matéria (Rio de Janeiro), Volume: 25, Issue: 3, Article number: e-12829, Published: 16 SEP 2020 CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET Matéria (Rio de Janeiro) v.25 n.3 2020 Matéria (Rio de Janeiro. Online) instacron:RLAM |
| ISSN: | 1517-7076 |
| DOI: | 10.1590/s1517-707620200003.1129 |
| Popis: | Cobalt and niobium oxide solids modified with alkaline earth metals (Mg, Ca, and Sr) were synthesized and characterized to compare the second element effect on the catalyst structural and chemical properties. The materials were prepared by co-precipitation of cobalt nitrate and niobium oxalate solutions using ammonium hydroxide as precipitating agent. The samples were characterized by XRD, SEM, Ra-man, BET, TPR, ammonia TPD and cyclohexane dehydrogenation reaction (CHD). Results showed that Mg, Ca or Sr addition changed cobalt niobate crystalline structure, leading to alkaline earth metal nio-bates with lower crystallinity. It was observed that Mg, Ca or Sr increased the solids acidity and changed cobalt niobate reduction behavior so that the lowest amount of metallic cobalt was obtained when Mg was incorporated. Modifiers also decreased cobalt niobate dehydrogenation activity. This effect was higher with Mg or Sr addition. Fil: Pinheiro Sena, Maiana. Instituto Federal Da Bahia; Brasil Fil: Pereira de Lima, Simone. Instituto Federal Da Bahia; Brasil Fil: Santos Carvalho, Luciene. Instituto Federal Da Bahia; Brasil Fil: Ruiz, Doris. Universidad de Concepción; Chile Fil: Ballarini, Adriana Daniela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; Argentina Fil: Martins, André Rosa. Instituto Federal Da Bahia; Brasil |
| Databáze: | OpenAIRE |
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