Abstract: Surface organometallic chemistry (SOMC) is a recently developing research field. It is of great significance for the quantitative modification, restoration of solid surface, identification of the physical and chemical nature of surface and the preparation of new catalyst. The production of R₃Snl-O-MCM-41 (R₃SnlM) was obtained by heating tributyltin chloride and Al-MCM-41 mixture at 170℃ for 5 h under stirring in nitrogen atmosphere. The composition, structure and surface physical and chemical properties of the samples were characterized by inductively coupled plasma mass spectrometry (ICP-MS), ¹³C, ¹¹⁹Sn, ²⁹SI and ²⁷Al solid state NMR (nuclear magnetic resonance) spectra, in-situ pyridine infrared spectroscopy (Py-IR), N₂ adsorption-desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), etc. The results of ICP and organic elemental analysis shows that the grafting yield w_Sn was 6.46% for R₃SnlM. H₀ (the negative logarithm of the acid concentration)and the number of acid sites for R₃SnlM respectively were 2.77-0.99 and 4.8 mmol·g^-1 by the Hammett method. N₂ adsorption-desorption, XRD, TEM analysis showed that R₃SnlM with ordered hexagonal mesopore structure, resulted in the decease of surface areas and pore size as well as the increase of mesoporous volume and surface acidity, as compared to Al-MCM-41. R₃SnlM was used in the synthesis of isoamyl acetate. The yield of isoamyl acetate was 96% when n(isoamyl alcohol):n(acetic acid) 1.0:1.0,w_R3SnM 5%, 138℃ for 5 h. The catalyst can be reused and the yield of 86% can be attained when catalyst was reused five times at the same catalytic conditions.

Key words: Al-MCM-41 molecular sieves, tributyltin chloride, grafting reaction, characterization, catalysis, isoamyl acetate

摘要： Surface organometallic chemistry (SOMC) is a recently developing research field. It is of great significance for the quantitative modification, restoration of solid surface, identification of the physical and chemical nature of surface and the preparation of new catalyst. The production of R₃Snl-O-MCM-41 (R₃SnlM) was obtained by heating tributyltin chloride and Al-MCM-41 mixture at 170℃ for 5 h under stirring in nitrogen atmosphere. The composition, structure and surface physical and chemical properties of the samples were characterized by inductively coupled plasma mass spectrometry (ICP-MS), ¹³C, ¹¹⁹Sn, ²⁹SI and ²⁷Al solid state NMR (nuclear magnetic resonance) spectra, in-situ pyridine infrared spectroscopy (Py-IR), N₂ adsorption-desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), etc. The results of ICP and organic elemental analysis shows that the grafting yield w_Sn was 6.46% for R₃SnlM. H₀ (the negative logarithm of the acid concentration)and the number of acid sites for R₃SnlM respectively were 2.77-0.99 and 4.8 mmol·g^-1 by the Hammett method. N₂ adsorption-desorption, XRD, TEM analysis showed that R₃SnlM with ordered hexagonal mesopore structure, resulted in the decease of surface areas and pore size as well as the increase of mesoporous volume and surface acidity, as compared to Al-MCM-41. R₃SnlM was used in the synthesis of isoamyl acetate. The yield of isoamyl acetate was 96% when n(isoamyl alcohol):n(acetic acid) 1.0:1.0,w_R3SnM 5%, 138℃ for 5 h. The catalyst can be reused and the yield of 86% can be attained when catalyst was reused five times at the same catalytic conditions.

关键词: Al-MCM-41 molecular sieves, tributyltin chloride, grafting reaction, characterization, catalysis, isoamyl acetate