The effect of heating rate and gas atmosphere on template decomposition in silicalite-1

被引：21

作者：

Gilbert, KH ^{[1
]}

Baldwin, RM ^{[1
]}

Way, JD ^{[1
]}

机构：

[1] Colorado Sch Mines, Dept Chem Engn, Golden, CO 80401 USA

来源：

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2001年 / 40卷 / 22期

关键词：

D O I：

10.1021/ie010069v

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Template evolution from TPABr/silicalite powder was studied in a thermogravimetric analyzer as a function of heating rate and gas atmosphere to determine the maximum rate of weight loss and the temperature at which the rate of weight loss was a maximum. Through the application of TPD theory, the activation energies of the thermal decomposition reactions in various gaseous atmospheres (helium, oxygen, air, ozone/air mixture) were also calculated. The results of these investigations showed that an increased calcination heating rate had a direct correlation with an increased rate of weight loss. The template removal reaction in an inert atmosphere (helium) was endothermic; however, the presence of oxidizing components in the gas atmosphere gave rise to significant exothermic reactions. We found that the least stressful conditions for template removal occurred with a heating rate of 0.5 K/min in an atmosphere containing a mixture of air and ozone (1%). For these conditions, the maximum rate of weight loss was 0.061%/min, and the temperature at maximum weight loss was 487 K; the template was fully removed at a final temperature of ca 723 K.

引用

页码：4844 / 4849

页数：6

共 20 条

[1]

Asswad J, 1988, ZEOLITES, V8, P221

[2] Alkylammonium polycations as structure-directing agents in MFI zeolite synthesis [J].

Beck, LW ;

Davis, ME .

MICROPOROUS AND MESOPOROUS MATERIALS, 1998, 22 (1-3) :107-114

[3] IDENTIFICATION OF THE VOLATILE PRODUCTS RESULTING FROM THE THERMAL-DECOMPOSITION OF TETRA-PROPYLAMMONIUM, TRI-PROPYLAMMONIUM, DI-PROPYLAMMONIUM, AND MONO-N-PROPYLAMMONIUM CATIONS OCCLUDED IN MFI-TYPE ZEOLITES [J].

BILGER, S ;

SOULARD, M ;

KESSLER, H ;

GUTH, JL .

ZEOLITES, 1991, 11 (08) :784-791

[4] Stability of oriented silicalite-1 films in view of zeolite membrane preparation [J].

denExter, MJ ;

vanBekkum, H ;

Rijn, CJM ;

Kapteijn, F ;

Moulijn, JA ;

Schellevis, H ;

Beenakker, CIN .

ZEOLITES, 1997, 19 (01) :13-20

[5] SYNTHESIS AND CHARACTERIZATION OF ZSM-5 TYPE ZEOLITES .1. PHYSICOCHEMICAL PROPERTIES OF PRECURSORS AND INTERMEDIATES [J].

DEROUANE, EG ;

DETREMMERIE, S ;

GABELICA, Z ;

BLOM, N .

APPLIED CATALYSIS, 1981, 1 (3-4) :201-224

[6] Template-removal-associated microstructural development of porous-ceramic-supported MFI zeolite membranes [J].

Dong, JH ;

Lin, YS ;

Hu, MZC ;

Peascoe, RA ;

Payzant, EA .

MICROPOROUS AND MESOPOROUS MATERIALS, 2000, 34 (03) :241-253

[7] CALCINATION OF LARGE MFI-TYPE SINGLE-CRYSTALS .2. CRACK FORMATION AND THERMOMECHANICAL PROPERTIES IN VIEW OF THE PREPARATION OF ZEOLITE MEMBRANES [J].

GEUS, ER ;

VANBEKKUM, H .

ZEOLITES, 1995, 15 (04) :333-341

[8] Influence of the hydrophobic character of structure-directing agents for the synthesis of pure-silica zeolites [J].

Goretsky, AV ;

Beck, LW ;

Zones, SI ;

Davis, ME .

MICROPOROUS AND MESOPOROUS MATERIALS, 1999, 28 (03) :387-393

[9]

HURST KE, 2000, THESIS COLORADO SCH, P113

[10]

Jacobs P.A., 1987, Synthesis of High-Silica Aluminosilicate Zeolites

← 1 2 →