期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 12, 期 5, 页码 1582-1586出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/b107795n
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Phosphorus species could be grafted onto the surface of Si-MCM-41 by simply treating Si-MCM-41 with phosphoric acid for a very short period, followed by high temperature calcination. The existence and state of surface phosphorus species grafted on Si-MCM-41 are confirmed by XPS measurement. Using XRD and N-2 adsorption measurements, the uniform mesoporous structure of MCM-41 is shown to be quite stable under phosphoric acid treatment. FTIR results show that the surface phosphorus species grafted onto the surface of MCM-41 can selectively increase the number of Bronsted acid sites on the surface without forming any Lewis acid sites. Using NH3-TPD, the mild acidity of the generated Bronsted acid sites on phosphorus-containing MCM-41 significantly enhances its catalytic activity for the dehydration of isopropanol.
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