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Alxn+-grafted MCM-41 Catalysts: Probing the Influence of Temperature on the Alumination Process

Authors
Journal
Journal of Catalysis
0021-9517
Publisher
Elsevier
Publication Date
Volume
193
Issue
1
Identifiers
DOI: 10.1006/jcat.2000.2874
Keywords
  • Al-Grafted Mcm-41
  • Aluminosilicate Mcm-41
  • Alumination
  • Grafting
  • Grafting Temperature
  • Catalytic Activity
  • Acidity

Abstract

Abstract The influence of grafting temperature on Al-grafted MCM-41 catalysts prepared by reacting pure silica MCM-41 with aqueous solutions containing Al polycations was investigated by performing the alumination at room temperature (RT) or 80°C. Better retention of structural integrity was achieved at 80°C than at RT, and incorporation of Al was up to four times higher at 80°C. The higher Al content of materials grafted at 80°C translated to higher acid content and higher total conversions for the dealkylation of cumene. However, the catalytic activity per active site (TOF values) was higher for RT-grafted materials presumably due to better site isolation.

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