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Catalysis Letters

, Volume 70, Issue 1–2, pp 67–73 | Cite as

Methane dehydro‐aromatization over Mo/MCM‐22 catalysts: a highly selective catalyst for the formation of benzene

  • Yuying Shu
  • Ding Ma
  • Longya Xu
  • Yide Xu
  • Xinhe Bao
Article

Abstract

A molybdenum‐modified MCM‐22 catalyst has been used for methane dehydro‐aromatization. The catalytic performance on this Mo/MCM‐22 catalyst is featured by a higher yield of benzene and a lesser yield of naphthalene in comparison with that on a Mo/HZSM‐5 catalyst under the same experimental conditions. Methane conversion of 10.0% and benzene selectivity of 80% over a 6Mo/MCM‐22 catalyst at 973 K was obtained. Based on the effect of contact time, it is suggested that the reaction is severely inhibited by the products, probably due to their strong adsorption and slow desorption. The Mo/MCM‐22 catalysts were characterized by XRD, NH3‐TPD and TPSR techniques. XRD patterns of the Mo/MCM‐22 catalysts confirmed that Mo species are highly dispersed on/in the MCM‐22 zeolite if the Mo loading is less than 10%. NH3‐TPD experiment shows that the MCM‐22 zeolite contains strong and exchangeable Brønsted acid sites. TPSR of methane revealed that there is an induction period during which the Mo species are reduced by methane and transformed probably into Mo2C or Mo2OxCy. It is concluded that the nature of the methane dehydro‐aromatization reaction over the Mo/MCM‐22 catalysts is similar to that on the Mo/HZSM‐5 catalysts. The unique pore systems, the proper acid strength of the MCM‐22 zeolite and the Mo species are factors important for methane dehydro‐aromatization over Mo/MCM‐22 catalysts.

zeolite MCM‐22 Mo/MCM‐22 catalyst methane dehydro‐aromatization benzene 

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References

  1. [1]
    Y. Xu and L. Lin, Appl. Catal. A 188 (1999) 53.CrossRefGoogle Scholar
  2. [2]
    F. Solymosi, A. Erdőhelyi and A. Szöke, Catal. Lett. 32 (1995) 43.CrossRefGoogle Scholar
  3. [3]
    F. Solymosi, A. Szöke and J. Cserényi, Appl. Catal. A 142 (1996) 361.CrossRefGoogle Scholar
  4. [4]
    F. Solymosi, A. Szöke and J. Cserényi, Catal. Lett. 39 (1996) 157.CrossRefGoogle Scholar
  5. [5]
    F. Solymosi, J. Cserényi, A. Szöke, T. Bansagi and A. Dszko, J. Catal. 165 (1997) 150.CrossRefGoogle Scholar
  6. [6]
    D. Wang, J.H. Lunsford and M.P. Rosynek, Topics Catal. 3 (1996) 289.CrossRefGoogle Scholar
  7. [7]
    D. Wang, J.H. Lunsford and M.P. Rosynek, J. Catal. 169 (1997) 347.CrossRefGoogle Scholar
  8. [8]
    Y. Lu, Z. Xu, Z. Tian, T. Zhang and L. Lin, Catal. Lett. 62 (1999) 215.CrossRefGoogle Scholar
  9. [9]
    S. Liu, L. Wang, Q. Dong, R. Ohnishi and M. Ichikawa, Stud. Surf. Sci. Catal. 119 (1998) 241.Google Scholar
  10. [10]
    R.W. Borry III, E.C. Lu, Y.-H. Kim and E. Iglesia, Stud. Surf. Sci. Catal. 119 (1998) 403.Google Scholar
  11. [11]
    R.W. Borry III, Y.H. Kim, A. Huffsmith, J.A. Reimer and E. Iglesia, J. Phys. Chem. B 103 (1999) 5787.CrossRefGoogle Scholar
  12. [12]
    Y.-H. Kim, R.W. Borry III and E. Iglesia, Micropor. Mesopor. Mater. 35–36 (2000) 495.CrossRefGoogle Scholar
  13. [13]
    W. Li, G.D. Meitzner, R.W. Borry III and E. Iglesia, J. Catal. 191 (2000) 373.CrossRefGoogle Scholar
  14. [14]
    B.M. Weckhuysen, D. Wang, M.P. Rosynek and J.H. Lunsford, J. Catal. 175 (1998) 338.CrossRefGoogle Scholar
  15. [15]
    L. Wang, R. Ohnishi and M. Ichikawa, Catal. Lett. 62 (1999) 29.CrossRefGoogle Scholar
  16. [16]
    Y. Xu, W. Liu, S. Wong, L. Wang and X. Guo, Catal. Lett. 40 (1996) 207.CrossRefGoogle Scholar
  17. [17]
    W. Liu, Y. Xu, S. Wong, J. Qiu and N. Yang, J. Mol. Catal. A 120 (1997) 257.CrossRefGoogle Scholar
  18. [18]
    W. Zhang, D. Ma, X. Liu, X. Liu and X. Bao, J. Chem. Soc. Chem. Commun. (1999) 1091.Google Scholar
  19. [19]
    W. Zhang, D. Ma, X. Han, X. Liu, X. Bao, X. Guo and X. Wang, J. Catal. 188 (1999) 393.CrossRefGoogle Scholar
  20. [20]
    D. Ma, Y. Shu, W. Zhang, X. Han, Y. Xu and X. Bao, Angew. Chemie, in press.Google Scholar
  21. [21]
    J.Z. Zhang, M.A. Long and R.F. Howe, Catal. Today 44 (1998) 293.CrossRefGoogle Scholar
  22. [22]
    L. Wang, L. Tao, M. Xie, G. Xu, J. Huang and Y. Xu, Catal. Lett. 21 (1993) 35.CrossRefGoogle Scholar
  23. [23]
    Y. Xu, S. Liu, L. Wang, M. Xie and X. Guo, Catal. Lett. 30 (1995) 135.CrossRefGoogle Scholar
  24. [24]
    R. Ohnishi, S. Liu, Q. Dong, L. Wang and M. Ichikawa, J. Catal. 182 (1999) 92.CrossRefGoogle Scholar
  25. [25]
    C. Zhang, S. Li, Y. Yuan, W. Zhang, T. Wu and L. Lin, Catal. Lett. 56 (1998) 207.CrossRefGoogle Scholar
  26. [26]
    M.K. Rubin and P. Chu, US Patent 4 954 325 (1990).Google Scholar
  27. [27]
    R.M. Dessau and R.D. Partridge, US Patent 4 962 250 (1990).Google Scholar
  28. [28]
    K.J. Del Rossi and A. Huss, Jr., US Patent 5 107 047 (1992).Google Scholar
  29. [29]
    R.P.L. Absil, E. Bowes, G.J. Green, D.O. Marler, D.S. Shihabi and R.F. Socha, US Patent 5 085 762 (1992).Google Scholar
  30. [30]
    C.T.W. Chu, T.F. Degnan and B.K. Huh, US Patent 4 982 033 (1991).Google Scholar
  31. [31]
    C.T.W. Chu, US Patent 4 956 514 (1990).Google Scholar
  32. [32]
    A. Corma, A. Martinez and C. Martinez, Catal. Lett. 28 (1994) 187.CrossRefGoogle Scholar
  33. [33]
    A. Corma, C. Corell, F. Lopis, A. Martinez and J. Perez-Pariente, Appl. Catal. A 115 (1994) 121.CrossRefGoogle Scholar
  34. [34]
    J.A. Lawton, S.L. Lawton, M.E. Leonowicz and M.K. Rubin, Stud. Surf. Sci. Catal. 98 (1995) 250.Google Scholar
  35. [35]
    N. Kumar and L.E. Lindfors, Appl. Catal. A 147 (1996) 175.CrossRefGoogle Scholar
  36. [36]
    Y. Shu, Y. Xu, S. Wong, L. Wang and X. Guo, J. Catal. 170 (1997) 11.CrossRefGoogle Scholar
  37. [37]
    A. Corma, C. Corell, J. Perez-Pariente, J.M. Guil, R. Guil-Lopez, S. Nicolopoulus, J. Gonzalez-Calbet and M. Vallet-Regi, Zeolites 16 (1996) 7.CrossRefGoogle Scholar
  38. [38]
    A. Corma, V. Gonzalez-Alfaro and A.V. Orchilles, Appl. Catal. A 129 (1995) 203.CrossRefGoogle Scholar
  39. [39]
    R. Ravishankar, T. Sen, V. Ramaswamy, H.S. Soni, S. Ganapathy and S. Sivasanker, Stud. Surf. Sci. Catal. 84 (1994) 331.CrossRefGoogle Scholar
  40. [40]
    S. Unverricht, M. Hunger, S. Ernst, H.G. Karge and J. Weitkamp, Stud. Surf. Sci. Catal. 84 (1994) 37.Google Scholar
  41. [41]
    K. Segawa and W.K. Hall, J. Catal. 76 (1982) 133.CrossRefGoogle Scholar
  42. [42]
    H. Jiang, L. Wang, W. Cui and Y. Xu, Catal. Lett. 57 (1999) 95.CrossRefGoogle Scholar

Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • Yuying Shu
  • Ding Ma
  • Longya Xu
  • Yide Xu
  • Xinhe Bao

There are no affiliations available

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