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Preparation of magnesia-silica oxides: Effect of Mg/Si ratio and sulfate on acidity

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Abstract

Mg−Si binary oxides were prepared by the sol-gel method, using magnesium diethoxide and tetraethoxysilane as starting materials. Mg−Si mixed oxides were prepared at pH3 and 9 at nominal concentrations of 1.3, 4.0, and 6.7 mole% MgO. Density and strength of the acid sites were determined by pyridine thermal programmed desorption. Comparable Lewis acidity was found in pH3 and 9 preparations. However, when the samples were sulfated with sulfuric acid, strong Bronsted acidity was developed, reaching a maximum at 6.7 mole% MgO. The strong acidity of sulfated samples was corroborated using the isopropanol decomposition reaction as catalytic test. Similar conversions are obtained at 100°C on sulfated samples, whereas 260°C are required for non-sulfated ones.

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References

  1. G. Connell and J.A. Dumesic. J. Catal.105, 285 (1987).

    Article  CAS  Google Scholar 

  2. K. Tanabe, H. Hattori, T. Sumiyoshi, K. Tamaru, and T. Kondo, J. Catal.53, 1 (1978).

    Article  CAS  Google Scholar 

  3. A. Corma, J.M. López Nieto, and N. Paredes, Appl. Catal.97, 159 (1993).

    Article  CAS  Google Scholar 

  4. H. Noller, J.A. Lercher, and H. Vinek, Mater. Chem. Phys. Chem.18, 577 (1988).

    Article  CAS  Google Scholar 

  5. H. Vinek, H. Noller, M. Ebel, and K. Schwarz, J. Chem. Soc. Faraday Trans. I73, 743 (1977).

    Article  Google Scholar 

  6. A.M. Youssef, L.B. Khalil, and B.S. Girgis, Appl. Catal1, 1 (1992).

    Article  Google Scholar 

  7. B.S. Girgis, A.M. Youssef, and M.N. Alaya, Bull. Soc. Chem. Fr.11&12, 980 (1988).

    Google Scholar 

  8. E. Merk, J. Mater. Chem.3, 721 (1993).

    Article  Google Scholar 

  9. T. López, J. Navarrete, R. Gómez, P. Armendariz, and F. Figueras, Appl. Catal.125, 217 (1995).

    Article  Google Scholar 

  10. T. López, M. Asomoza, and R. Gomez, J. Non-Cryst. Solids147&148, 769 (1992).

    Article  Google Scholar 

  11. H. Benesi. J. Am. Chem. Soc.78, 5490 (1956).

    Article  CAS  Google Scholar 

  12. J.B. Peri, J. Phys. Chem.69, 220 (1965).

    CAS  Google Scholar 

  13. S. Rajagopal, T.L. Grimm, D.J. Collins, and R. Miranda, J. Catal.137, 453 (1992).

    Article  CAS  Google Scholar 

  14. L.J. Bellamy,The Infra-red Spectra of Complex Molécules (Chapman and Hall, London, 1975).

    Google Scholar 

  15. C.J. Brinker and G.W. Scherer, inSol-gel Science (Acad. Press Inc., N. Y., 1990).

    Google Scholar 

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Authors and Affiliations

  1. Dept. de Química, Universidad Autónoma Metropolitana Iztapalapa, P.O. Box 55-534, México, D.F., México

    T. Lopez, M. E. Llanos & R. Gomez

  2. Universidad de Guanajuato, Lascurain de Retana s/n, Guanajuato, Gto, México

    T. Lopez & R. Gomez

  3. Instituto Mexicano del Petróleo, SGIDTTI, P.O. Box 14-805, México, D.F.

    M. E. Llanos, J. Navarrete, I. Schifter & P. Salas

Authors
  1. T. Lopez
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  2. M. E. Llanos
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  3. J. Navarrete
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  4. I. Schifter
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  5. P. Salas
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  6. R. Gomez
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Lopez, T., Llanos, M.E., Navarrete, J. et al. Preparation of magnesia-silica oxides: Effect of Mg/Si ratio and sulfate on acidity. J Sol-Gel Sci Technol 8, 321–325 (1997). https://doi.org/10.1007/BF02436859

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  • DOI: https://doi.org/10.1007/BF02436859

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