Navegando por Autor "Ruíz, Juan Alberto Chavez"

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Preparation and characterization of lanthanum palygorskite clays as acid catalysts
(Elsevier, 2002-10-07) Melo, Dulce Maria de Araújo; Ruíz, Juan Alberto Chavez; Melo, Marcus Antônio de Freitas; Vitor Sobrinho, Eledir; Martinelli, Antonio Eduardo
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

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