Characterization of the structural and surface properties of chemically modified MCM-41 material

✍ Scribed by X.S Zhao; G.Q Lu; X Hu

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 477 KB
• Volume: 41
• Category: Article
• ISSN: 1387-1811
• DOI: 10.1016/s1387-1811(00)00262-6

✦ Synopsis

Mesoporous Mobil catalytic materials of number 41 (MCM-41) silica was chemically modi®ed using both inorganic and organic precursors and characterized using the techniques, XRD, XPS, MAS NMR, FTIR, UV±Vis, and physical adsorption of nitrogen, hydrocarbons (hexane, benzene, acetone, and methanol) and water vapor. Modi®cation using organic reagents was found to result in a signi®cant loss in porosity and a shape change of surface properties (increased hydrophobicity and decreased acidity). With inorganic modifying reagents, the decrease in porosity was also observed while the surface properties were not signi®cantly altered as re¯ected by the adsorption isotherms of organics and water vapors. Chemical modi®cations can greatly improve the hydrothermal stability of MCM-41 material because of the enhanced surface hydrophobicity (with organic modi®ers) or increased pore wall thickness (with inorganic modi®ers).