Resumo

PAUCAR ALVAREZ, CARLOS G. et al. CORDIERITE 2MgO. 2A12 O3. 5SiO2 SYNTHETIZED BY HYDROXYHYDROGEL ROUTE. Bol. cienc. tierra [online]. 2009, n.26, pp.39-46. ISSN 0120-3630.

Materials based on cordierite 2MgO 2A12 O3 5SiO2 are used for refractoriness and catalytic processes at temperatures above 500 Celsius degrees where high thermal shock resistance, low thermal expansion coefficient, high resistance to corrosion gas, low dielectric constant and good mechanical properties are required. In the present work, the synthesis of cordierite by a colloidal chemistry route forming hydroxyhydrogels is reported, which were dispersed mechanically with a rotor stator. The powders obtained were sintered with variation of time at 1200, 1300 and 1350 Celsius degrees. The monoliths were characterized by microchemical analysis, differential thermal analysis (DTA), Xray diffraction (XRD), scanning electronic microscopy (SEM) and water absorption measurements. In this study the temperature of crystallization of cordierite of cordierite 2MgO 2A12 O3 5SiO2 was lowered which occurs at about 1200 degrees Celsius, and monoliths with low porosity were generated by sintering processes as a function of temperature, up to the 1350 degrees Celsius.

Palavras-chave : Cordierite; Synthesis; Hydroxidhydrogels; Porosity; Catalyst Support.

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