View PDF Version
 
DOI: 10.1039/A701097D (Paper) Reference Section for: J. Chem. Soc., Faraday Trans., 1997, 93, 3243-3248

Ammonia adsorption–desorption over the strong solid acid catalyst H3PW12O40 and its Cs+ and NH4+ salts Comparison with sulfated zirconia

(Note: The full text of this document is currently only available in the PDF Version )

Nadine Essayem, Roger Frety, Gisèle Coudurier and Jacques C. Vedrine

Abstract

Ammonia thermodesorption using a thermal conductivity detector does not allow an unambiguous study of the acidic properties of strong solid acids such as heteropolycompounds and sulfated zirconia. As a matter of fact, these strong acids release compounds other than NH3 during TPD experiments which obviously involves side-reactions. In the present work, in order to circumvent the preceding problems, NH3 adsorption and TPD experiments were performed using a dual mass spectrometry (MS)–TCD detection system. The equipment was applied to the characterization of the acidic properties of porous heteropolycompounds. CsxH3-xPW12 O40 and (NH4)2.8H0.2PW12 O40, by comparison with the parent acid H3PW12O40 and another strong solid acid, sulfated zirconia. It was observed that gaseous NH3 reacted and formed ionic species, leading to (NH4)3PW12O40 in the case of heteropolyacids (HPA) and probably (NH4)HSO4 in the case of sulfated zirconia. Consequently, based on the amount of NH3 irreversibly adsorbed at 373 K the number of acid sites has been deduced. For all HPA samples, TPD profiles of NH3 appeared quite similar suggesting that the TPD curves were more connected to the stability of these ammonium salts rather than to the acid strength of the solid.

References

  1. M. Misono, Catal. Lett., 1991, 12, 63 CrossRef.
  2. M. Misono, Catal. Rev. Sci. Eng., 1987, 29, 269 Search PubMed.
  3. I. V. Kozhevnikov, Russ. Chem. Rev. Engl. Transl., 1993, 62, 473 Search PubMed.
  4. I. V. Kozhevnikov and K. I. Mateev, Appl. Catal., 1993, 5, 135.
  5. R. J. J. Jansen and H. M. Van Veldhuizen, Recl. Trav. Chim. Pays-Bas, 1994, 113, 115 CAS.
  6. C. Hu, M. Hashimoto, T. Okuhara and M. Misono, J. Catal., 1993, 143, 437 CrossRef CAS.
  7. A. K. Ghosh and J. B. Moffat, J. Catal., 1986, 101, 238 CrossRef CAS.
  8. H. Nishi, K. Nowinska and J. B. Moffat, J. Catal., 1989, 116, 480 CrossRef CAS.
  9. L. Baraza and M. T. Pope, J. Phys. Chem., 1975, 79, 92 CrossRef.
  10. K. Na, T. Okuhara and M. Misono, Chem. Lett., 1993, 1141 CAS.
  11. N. Essayem, G. Coudurier, M. Fournier and J. C. Védrine, Catal. Lett., 1995, 34, 223 CAS.
  12. T. Okuhara, T. Nishimura, H. Watanabe and M. Misono, J. Mol. Catal., 1992, 74, 247 CrossRef CAS.
  13. F. Xian Lian Cai and F. Lefebvre, Catal. Lett., 1993, 22, 387 CrossRef.
  14. H. Soeda, T. Okuhara and M. Misono, Chem. Lett., 1994, 909 CAS.
  15. M. Ai, J. Catal., 1981, 71, 88 CrossRef.
  16. M. Misono, N. Mizuno, K. Katamura, A. Kasai, Y. Konoshi, K. Sakata, T. Okuhara and Y. Yoneda, Bull. Chem. Soc. Jpn., 1982, 55, 400 CAS.
  17. E. M. Serwicka, K. Bruckman, J. Haber, E. A. Paukshlis and E. N. Yurchenko, Appl. Catal., 1991, 73, 153 CrossRef CAS.
  18. F. Cavani, E. Etienne, M. Favaro, A. Galli, F. Trifiro and G. Hecquet, Catal. Lett., 1995, 32, 215 CrossRef CAS.
  19. T. Matsuda, M. Sato, T. Kanno, H. Miura and K. Sugiyama, J. Chem. Soc., Faraday Trans. 1, 1981, 72, 3107 RSC.
  20. T. Baba, H. Watanabe and Y. Ono, J. Chem. Phys., 1983, 87, 2406 CAS.
  21. T. Okuhara, A. Kasai, N. Hayakawa, Y. Yoneda and M. Misono, J. Catal., 1983, 83, 121 CrossRef CAS.
  22. T. Okuhara, T. Mashimito, T. Hibi and M. Misono, J. Catal., 1985, 93, 224 CrossRef CAS.
  23. B. W. L. Southward, J. S. Vaughan and T. O'Connor, J. Catal., 1995, 153, 2 CrossRef CAS.
  24. J. G. Highfield and J. B. Moffat, J. Catal., 1984, 88, 177 CrossRef CAS.
  25. B. K. Hodnett and J. B. Moffat, J. Catal., 1984, 88, 253 CrossRef CAS.
  26. H. Matsushasi, H. Motoi and K. Arata, Catal. Lett., 1994, 26, 325 CrossRef.
  27. S. B. Sharma, B. L. Meyers, D. T. Chen, J. Miller and J. A. Dumesic, Appl. Catal., A: General, 1993, 102, 253 CrossRef CAS.
  28. F. Lefebvre, B. Jouguet and A. Auroux, React. Kinet. Catal. Lett., 1994, 53, 297 CAS.
  29. F. Lefebvre, F. Xian Liu Cai and A. Auroux, J. Mater. Chem., 1994, 4, 125 RSC.
  30. F. Babou, G. Coudurier and J. C. Védrine, J. Catal., 1995, 152, 3414 CrossRef CAS.
  31. R. Fréty, P. N. Da Silva and M. Guenin, Appl. Catal., A: General, 1990, 58, 175 CAS.
  32. Proc. 8th Int. Congr. Catalysis, ed. Dechema, Verlag Chemie, Frankfurt am Main, 1984, vol. 5, p. 611 Search PubMed.
  33. C. Rocchiciolli-Deltcheff, R. Thouvenot and R. Franck, Spectrochim. Acta, Part A, 1976, 32, 587 CrossRef.
  34. N. Essayem, G. Coudurier and J. C. Védrine, Proceedings of the DGMK Conference: Catalysis on Solid Acids and Bases, DGMK Tagungsbericht, 1996, p. 111 Search PubMed.
Click here to see how this site uses Cookies. View our privacy policy here.