Ethylbenzene dehydrogenation in the presence of carbon dioxide overmagnesia-supported iron oxides
| Autor: | Sirlene Barbosa Lima, Ana Paula de Melo Monteiro, Maria do Carmo Rangel, Márcia de Souza Ramos, Sergio Gustavo Marchetti |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Inorganic chemistry
chemistry.chemical_element INGENIERÍAS Y TECNOLOGÍAS engineering.material Ethylbenzene Catalysis Styrene chemistry.chemical_compound Iron oxide nanoparticles Specific surface area Dehydrogenation Physical and Theoretical Chemistry Magnesium oxide Magnesium Ingeniería de Procesos Químicos Process Chemistry and Technology Spinel Hematite Ingeniería Química chemistry visual_art engineering visual_art.visual_art_medium |
| DOI: | 10.1016/j.molcata.2014.03.002 |
| Popis: | In recent years, several works have been addressed to decrease carbon dioxide emission or to capture, to storage and to use it. An attractive option is its use as feedstock of chemical industry, especially in dehydrogenation reactions (such as ethylbenzene dehydrogenation to produce styrene), providing and exothermic process which can be operated at lower temperatures, making negligible the cracking products. Aiming to find alternative catalysts for this reaction, magnesia-supported iron oxides were studied, being prepared by two different methods. The classical impregnation produced a spinel (MgFe2O4) coexisting with magnesia containing Fe3+ species, this catalyst showing higher specific surface area and being more active and selective than magnesia. Moreover, the deposition of iron nanoparticles through a magnetic fluid on magnesia produced magnesia-supported hematite nanoparticles co-existing with magnesia containing Fe3+ species. In this case, the specific surface area and the activity were even higher and the solid is much more reducible than the other sample. These findings were associated to hematite nanoparticles and to the lower tendency of iron species to diffuse into magnesia lattice. They show that the Fe3+ species are more active and selective to styrene as hematite nanoparticles than when they are in the environment of magnesium ferrite. Fil: De Souza Ramos, Marcia. Universidade Federal da Bahia. Instituto de Química. Grupo de Estudos em Cinética e Catálise; Brasil Fil: Barbosa Lima, Sirlene. Universidade Federal da Bahia. Instituto de Química. Grupo de Estudos em Cinética e Catálise; Brasil Fil: Marchetti, Sergio Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina Fil: De Melo Monteiro, Ana Paula. Universidade Federal da Bahia. Instituto de Química. Grupo de Estudos em Cinética e Catálise;; Brasil Fil: Rangel, Maria do Carmo. Universidade Federal da Bahia. Instituto de Química. Grupo de Estudos em Cinética e Catálise;; Brasil |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|