Preparation and characterization of lanthanum palygorskite clays as acid catalysts
| Autor: | E. V. Sobrinho, J.A.C Ruiz, Marcus Antônio de Freitas Melo, Antonio Eduardo Martinelli, D.M Araújo Melo |
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| Rok vydání: | 2002 |
| Předmět: |
Thermogravimetric analysis
Ion exchange Chemistry Characterization Mechanical Engineering Inorganic chemistry Metals and Alloys Infrared spectroscopy chemistry.chemical_element Palygorskite Isopropyl alcohol Catalysis chemistry.chemical_compound Adsorption Lanthanum Mechanics of Materials Materials Chemistry medicine Mineral clays medicine.drug |
| Zdroj: | Repositório Institucional da UFRN Universidade Federal do Rio Grande do Norte (UFRN) instacron:UFRN |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/s0925-8388(02)00384-5 |
| Popis: | Palygorskite clays containing 2, 4, 6 or 10% lanthanum (w/w) were prepared by ion-exchange from acid-leached natural clays. Samples were characterized by chemical and thermogravimetric analysis, X-ray diffraction, infrared spectroscopy, and N2 adsorption. Isopropyl alcohol was transformed in order to improve the acid behavior of the material. The introduction of La3+ did not change the structure of the palygorskite. Surface areas as high as 177.6 m2 g−1 were measured for catalysts containing 2% lanthanum. This material also showed a very good activity for alcohol dehydration. |
| Databáze: | OpenAIRE |
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