https://repositorio.ufba.br/handle/ri/6458
Tipo: | Artigo de Periódico |
Título: | Effect of iron on the properties of sulfated zirconia |
Título(s) alternativo(s): | Applied Catalysis A-General |
Autor(es): | Pereira, Amalia Luz Costa Marchetti, Sergio Gustavo Albornoz, Alberto Reyes, Patrício Oportus, Marcelo Varela, Maria do Carmo Rangel Santos |
Autor(es): | Pereira, Amalia Luz Costa Marchetti, Sergio Gustavo Albornoz, Alberto Reyes, Patrício Oportus, Marcelo Varela, Maria do Carmo Rangel Santos |
Abstract: | Sulfated zirconia has found several industrial applications, mainly for catalyzing reactions which require acidic sites. In order to control the properties of this solid, the effect of iron on the sulfated zirconia properties was studied in this work. Samples with different iron to zirconium molar ratios were prepared by the sol–gel method, followed by sulfation and characterization by several techniques. It was found that all iron ions go into zirconia when Fe/Zr 0.4. However, when higher amounts of iron (Fe/Zr 0.8) are added, hematite is segregated. Different phases can be obtained depending on the iron content and on the sulfur presence. Iron increases the specific surface areas of both sulfated and pure zirconia but does not affect the incorporation of sulfate groups as compared to pure zirconia. Iron also makes the solids thermally more stable and modifies the sulfated zirconia surface creating acidic sites with medium strength. Therefore, it is possible to control the acidity of the solid doping the sulfated zirconia with iron. All these changes are very useful for catalytic applications. |
Palavras-chave: | Iron-doped zirconia Sulfated iron oxide Sulfated zirconia |
URI: | http://www.repositorio.ufba.br/ri/handle/ri/6458 |
Data do documento: | 2008 |
Aparece nas coleções: | Artigo Publicado em Periódico (Química) |
Arquivo | Descrição | Tamanho | Formato | |
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CONFIG~1....0-S0926860X07006126-main.pdf Restricted Access | 296,09 kB | Adobe PDF | Visualizar/Abrir Solicitar uma cópia |
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