A FTIR spectroscopic study of surface acidity and basicity of mixed Mg,Al-oxides obtained by thermal decomposition of hydrotalcite |
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| Affiliation: | 1. Refining Division, Egyptian Petroleum Research Institute, 1 Ahmed El-Zomor St., Nasr City, 11727, Cairo, Egypt;2. Chemistry Department, Faculty of Science, Ain Shams University, Abbassia, 11566, Cairo, Egypt;1. “Ilie Murgulescu” Institute of Physical Chemistry, Romanian Academy, Splaiul Independentei 202, 060021 Bucharest, Romania;2. Department of Microbiology, Faculty of Biology, University of Bucharest, Research Institute of University of Bucharest, Aleea Portocalilor 1-3 , 60101 Bucharest, Romania;1. School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran;2. Nuclear Science and Technology Research Institute, End of North Karegar Ave., Tehran, Iran;1. Programa de Pós-Graduação em Química do Instituto de Química, Universidade do Estado do Rio de Janeiro (UERJ), Rua São Francisco Xavier, 524 Pavilhão Haroldo L. da Cunha, sala 424A-Maracanã, RJ 20559-900, Brazil;2. Divisão de Processamento e Caracterização de Materiais (DPCM), Instituto Nacional de Tecnologia (INT), Av. Venezuela, 82, sala 106-Saúde, RJ 20081-312, Brazil |
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| Abstract: | A hydrotalcite with a Mg:Al ratio of 2.5:1 has been synthesized and characterized. The solids obtained upon calcination of this material at 770 and 1023 K have been also characterized, and have been found to be a mixture of MgAl2O4 and MgO. Surface acidity and basicity of the solid calcined at 1023 K have been assessed by FTIR monitoring of pyridine and formic acid adsorption. It has been found that the surface is not acid, although a residual acidity, larger than that in pure MgO, exists. Adsorption of formic acid takes place dissociatively on surface, isolated hydroxyl groups, contrary to previous results with MgO, where dissociative adsorption took place through interaction with exposed oxide ions. |
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