A comparison between the precipitation and impregnation methods for water-gas shift catalysts
| Autor: | Sergio Gustavo Marchetti, Amalia Luz Costa Pereira, Alberto Albornoz, Alexilda Oliveira de Souza, Maria do Carmo Rangel, Guillermo Paternina Berrocal |
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| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
inorganic chemicals
WGSR Hydrogen Chemistry Process Chemistry and Technology Inorganic chemistry technology industry and agriculture chemistry.chemical_element Water gas INGENIERÍAS Y TECNOLOGÍAS Heterogeneous catalysis Catalysis Water-gas shift reaction Ingeniería Química Chromium chemistry.chemical_compound Specific surface area Otras Ingeniería Química Chromium-doped magnetite Physical and Theoretical Chemistry Magnetite |
| Popis: | The precipitation and impregnation methods in the preparation of chromium-doped magnetite for water gas shift reaction (WGSR) were compared in this work. This reaction is an important step in the commercial production of highly pure hydrogen from natural gas or naphtha feedstocks. It was found that the preparation method affects both the textural and catalytic properties of chromium-doped magnetite. However, chromium was able to preserve the specific surface area during the WGSR and to delay the metallic iron production, independently of the preparation method. Chromium caused a decrease in activity per area, depending on the preparation method. This fact was assigned to its ability in making the production of Fe2+ species more difficult, making the catalytic sites less active, because the redox cycle of the reaction becomes more difficult. The most active catalyst was obtained by adding chromium by impregnation, which led to a large amount of total chromium in the solid and then a catalyst with high specific surface area was produced. It was showed that the catalysts can be prepared in the active phase avoiding the reduction step, before reaction Fil: Pereira, Amalia Luz C.. Universidade Federal da Bahia. Instituto de Quımica; Brasil Fil: Berrocal, Guillermo Jose P.. Universidade Federal da Bahia. Instituto de Quımica; Brasil Fil: Marchetti, Sergio Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas ; Argentina Fil: Albornoz, Alberto. Instituto Venezolano de Investigaciones Cientıficas. Centro de Quımica; Venezuela Fil: de Souza, Alexilda O.. Universidade Estadual do Sudoeste da Bahia; Brasil Fil: Rangel, Maria do Carmo. Universidade Federal da Bahia. Instituto de Quımica; Brasil |
| Databáze: | OpenAIRE |
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