• Title of article

    Kinetics study of the isomerization of xylene on ZSM-5 zeolites: the effect of the modification with MgO and CaO Original Research Article

  • Author/Authors

    Yu-Guang Li، نويسنده , , Hu Jun، نويسنده ,

  • Issue Information
    روزنامه با شماره پیاپی سال 1996
  • Pages
    15
  • From page
    123
  • To page
    137
  • Abstract
    Xylene isomerization over HZSM-5, MgO-HZSM-5, and CaO-HZSM-5 zeolites has been studied using the pulse microreactor-chromatograph technique and the dynamic modeling method. The rate constants, activation energies, and activation entropies for each step in the reaction network on the catalysts have been obtained. These results indicate that strong acidity can favour the conversion of m-ando-xylene, while the isomerization of p-xylene not only takes place on strong acidic sites, but also on the weaker acidic sites. The parameters also indicate that under a loading amount of MgO or CaO in a mole ratio to framework aluminum equal to 1:1, the influence of steric encumbrance caused by the introduction of MgO or CaO is less as compared with the changes of the surface acidity.
  • Keywords
    Toluene disproportionation , Zeolites , Kinetic model , Xylene isomerization , Toluene alkylation
  • Journal title
    Applied Catalysis A:General
  • Serial Year
    1996
  • Journal title
    Applied Catalysis A:General
  • Record number

    1148435