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|Type:||Artigo de evento|
|Title:||The Stability Of H-mcm-22 Under Severe Thermal Conditions|
|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.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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