Influence of template extraction on structure, activity, and stability of MCM-41 catalysts

被引:189
作者
Hitz, S
Prins, R
机构
[1] Laboratory for Technical Chemistry, Swiss Federal Institute of Technology (ETH)
关键词
D O I
10.1006/jcat.1997.1659
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Up to 73% of the template in MCM-41 can be removed by extraction with solutions of an acid or salt in ethanol. When extracting with acidic ethanol, ion exchange of the sodium ions for protons is achieved simultaneously After calcination to remove the residual template, the resulting catalysts show high activity for the acetylation of 2-methoxynaphthalene. The activity depends on the sodium content and on the Si/Al ratio of the catalyst. MCM-41 materials which had not been extracted, but directly calcined to remove all template ions and subsequently ion exchanged, had a mesoporous structure that deteriorated with repeated calcinations. The acid extracted catalysts, on the other hand, retained their highly ordered pore structure throughout several thermal treatments. This stabilization results from the precondensation of silanol groups previously associated with template ions during the extraction. The extraction in acidic medium produced a MCM-41 catalyst with more Bronsted acid sites than the not extracted material. Al-27-NMR measurements showed that the observed increase in octahedral aluminium upon calcination usually ascribed to dealumination can also be explained by a change of coordination number depending on chemical environment as previously reported for zeolite beta. (C) 1997 Academic Press.
引用
收藏
页码:194 / 206
页数:13
相关论文
共 43 条
  • [1] PROTIODEACYLATION OF 4-SUBSTITUTED 1-ACETYL-2,6-DIMETHYLBENZENES IN SULFURIC-ACID - KINETICS AND MECHANISM
    ALKABI, J
    FAROOQI, JA
    GORE, PH
    NASSAR, AMG
    SAAD, EF
    SHORT, EL
    WATERS, DN
    [J]. JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2, 1988, (06): : 943 - 949
  • [2] Long-range interaction of alkali cations with the acidic OH groups in H-ZSM-5
    Baba, T
    Inoue, Y
    Ono, Y
    [J]. JOURNAL OF CATALYSIS, 1996, 159 (01) : 230 - 235
  • [3] BARRETT EP, 1951, J AM CHEM SOC, V73, P376
  • [4] A NEW FAMILY OF MESOPOROUS MOLECULAR-SIEVES PREPARED WITH LIQUID-CRYSTAL TEMPLATES
    BECK, JS
    VARTULI, JC
    ROTH, WJ
    LEONOWICZ, ME
    KRESGE, CT
    SCHMITT, KD
    CHU, CTW
    OLSON, DH
    SHEPPARD, EW
    MCCULLEN, SB
    HIGGINS, JB
    SCHLENKER, JL
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1992, 114 (27) : 10834 - 10843
  • [5] MULTINUCLEAR NMR-STUDIES REVEAL A COMPLEX ACID FUNCTION FOR ZEOLITE-BETA
    BECK, LW
    HAW, JF
    [J]. JOURNAL OF PHYSICAL CHEMISTRY, 1995, 99 (04) : 1076 - 1079
  • [6] BERGNA HE, 1994, ADV CHEM SER, V234, P1
  • [7] BLASCO T, 1995, J CATAL, V156, P64
  • [8] STUDY OF THE STATE OF ALUMINUM IN ZEOLITE-BETA
    BOURGEAT-LAMI, E
    MASSIANI, P
    DIRENZO, F
    ESPIAU, P
    FAJULA, F
    COURIERES, TD
    [J]. APPLIED CATALYSIS, 1991, 72 (01): : 139 - 152
  • [9] STABILITY OF THE TETRAHEDRAL ALUMINUM SITES IN ZEOLITE-BETA
    BOURGEAT-LAMI, E
    MASSIANI, P
    DIRENZO, F
    FAJULA, F
    DESCOURIERES, T
    [J]. CATALYSIS LETTERS, 1990, 5 (03) : 265 - 272
  • [10] PHYSISORPTION OF ARGON, NITROGEN AND OXYGEN BY MCM-41, A MODEL MESOPOROUS ADSORBENT
    BRANTON, PJ
    HALL, PG
    SING, KSW
    REICHERT, H
    SCHUTH, F
    UNGER, KK
    [J]. JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1994, 90 (19): : 2965 - 2967