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Type: Artigo de evento
Title: The Stability Of H-mcm-22 Under Severe Thermal Conditions
Author: Pastore H.O.
Oliveira E.C.
Frache A.
Dutra S.R.
Boccaleri E.
Marchese L.
Abstract: This study shows that the MWW structure is more stable than previously known zeolites. Structural, thermal and spectroscopic analyses have shown that acid MCM-22 zeolite is stable up to 1373K under vacuum and to 1473K in air. The Brönsted hydroxyl groups withstand temperatures up to 1173K. At 1473K there is a phase transition from the MWW structure into α-cristobalite when the sample is under vacuum while for the sample treated in air only a small fraction of the total is transformed to α-cristobalite at 1473K.
Rights: fechado
Identifier DOI: 
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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