Chemical, structural, and catalytic characteristics of Al-MCM-41 prepared by pH-controlled synthesis

被引：52

作者：

Lindlar, B ^{[1
]}

Kogelbauer, A ^{[1
]}

Prins, R ^{[1
]}

机构：

[1] ETH Zurich, Tech Chem Lab, CH-8092 Zurich, Switzerland

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2000年 / 38卷 / 2-3期

关键词：

MCM-41; pH adjustment; thermal stability; Friedel-Crafts acylation;

D O I：

10.1016/S1387-1811(99)00291-7

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Detailed investigations on the effect of pH adjustment at a value of 11 during Al-MCM-41 synthesis with regard to changes in structure, chemical composition, and catalytic activity are described. Long-range order (XRD), surface area (BET), and pore size distribution (BJH) improved remarkably when the pH of the synthesis gel was adjusted intermediately. The Si/Al ratio (AAS) and the yield of Al-MCM-41 nearly doubled in the case of a threefold pH adjustment. The catalytic activity for Friedel-Crafts acylation of 2-methoxynaphthalene was about three times higher for pH-adjusted samples. These effects became less pronounced with increasing number of adjustments. Comparable results were obtained when acetic, sulfuric, nitric, or citric acid was used for the pH adjustment. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：167 / 176

页数：10

共 20 条

[1] X-RAY-DIFFRACTION STUDY OF MESOPHASES OF CETYLTRIMETHYLAMMONIUM BROMIDE IN WATER, FORMAMIDE, AND GLYCEROL [J].

AUVRAY, X ;

PETIPAS, C ;

ANTHORE, R ;

RICO, I ;

LATTES, A .

JOURNAL OF PHYSICAL CHEMISTRY, 1989, 93 (21) :7458-7464

[2] THE DETERMINATION OF PORE VOLUME AND AREA DISTRIBUTIONS IN POROUS SUBSTANCES .1. COMPUTATIONS FROM NITROGEN ISOTHERMS [J].

BARRETT, EP ;

JOYNER, LG ;

HALENDA, PP .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1951, 73 (01) :373-380

[3] A NEW FAMILY OF MESOPOROUS MOLECULAR-SIEVES PREPARED WITH LIQUID-CRYSTAL TEMPLATES [J].

BECK, JS ;

VARTULI, JC ;

ROTH, WJ ;

LEONOWICZ, ME ;

KRESGE, CT ;

SCHMITT, KD ;

CHU, CTW ;

OLSON, DH ;

SHEPPARD, EW ;

MCCULLEN, SB ;

HIGGINS, JB ;

SCHLENKER, JL .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1992, 114 (27) :10834-10843

[4] Structure-directed materials syntheses: Synthesis field diagrams for the preparation of mesostructured silicas [J].

Behrens, P ;

Glaue, A ;

Haggenmuller, C ;

Schechner, G .

SOLID STATE IONICS, 1997, 101 :255-260

[5] Adsorption of gases in multimolecular layers [J].

Brunauer, S ;

Emmett, PH ;

Teller, E .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1938, 60 :309-319

[6] STUDIES ON MESOPOROUS MATERIALS .1. SYNTHESIS AND CHARACTERIZATION OF MCM-41 [J].

CHEN, CY ;

LI, HX ;

DAVIS, ME .

MICROPOROUS MATERIALS, 1993, 2 (01) :17-26

[7] STUDIES ON MESOPOROUS MATERIALS .2. SYNTHESIS MECHANISM OF MCM-41 [J].

CHEN, CY ;

BURKETT, SL ;

LI, HX ;

DAVIS, ME .

MICROPOROUS MATERIALS, 1993, 2 (01) :27-34

[8] Further improvements in the long-range order of MCM-41 materials [J].

Edler, KJ ;

White, JW .

CHEMISTRY OF MATERIALS, 1997, 9 (05) :1226-1233

[9]

Harvey G, 1995, STUD SURF SCI CATAL, V94, P397

[10]

Hitz S, 1998, STUD SURF SCI CATAL, V117, P519

← 1 2 →