ABOUT COKE DEPOSITION ON ZEOLITE HY - A129XE-NMR STUDY

被引：36

作者：

ITO, T ^{[1
]}

BONARDET, JL ^{[1
]}

FRAISSARD, J ^{[1
]}

NAGY, JB ^{[1
]}

ANDRE, C ^{[1
]}

GABELICA, Z ^{[1
]}

DEROUANE, EG ^{[1
]}

机构：

[1] FAC UNIV NOTRE DAME PAIX, CATALYSE LAB, B-5000 NAMUR, BELGIUM

来源：

APPLIED CATALYSIS | 1988年 / 43卷 / 01期

关键词：

Catalysts - Deactivation - Nuclear Magnetic Resonance - Applications - Xenon - Adsorption;

D O I：

10.1016/S0166-9834(00)80895-7

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：

129Xe-NMR of xenon sorbed on coked zeolites is a powerful tool to characterize the distribution of coke in the zeolites. A small amount of homogeneously deposited coke does not alter significantly the available free volume (Hex-5) whereas heterogeneously distributed coke modifies drastically the free volume accessible to xenon atoms (Pr-15 and Pr-33). It is concluded that coke formed from propylene obstructs the access to some supercages. The presence of external coke is shown by a new NMR line characteristic of xenon atoms adsorbed in 'macrocavities'. Upon regeneration, external coke is first eliminated and the slow removal of internal coke leads to partially decoked supercages of various effective sizes.

引用

页码：L5 / L11

页数：7

共 14 条

[1] METHANOL CONVERSION ON ACIDIC ZSM-5, OFFRETITE, AND MORDENITE ZEOLITES - A COMPARATIVE-STUDY OF THE FORMATION AND STABILITY OF COKE DEPOSITS [J].

DEJAIFVE, P ;

AUROUX, A ;

GRAVELLE, PC ;

VEDRINE, JC ;

GABELICA, Z ;

DEROUANE, EG .

JOURNAL OF CATALYSIS, 1981, 70 (01) :123-136

[2] XE-129 NMR OF XENON ADSORBED ON ZEOLITES - RELATIONSHIP BETWEEN THE CHEMICAL-SHIFT AND THE VOID SPACE [J].

DEMARQUAY, J ;

FRAISSARD, J .

CHEMICAL PHYSICS LETTERS, 1987, 136 (3-4) :314-318

[3] NUCLEAR MAGNETIC-RESONANCE STUDY OF XENON ADSORBED ON METAL-NAY ZEOLITES - A NEW METHOD FOR THE DETERMINATION OF THE MEAN NUMBER OF ATOMS IN SMALL METALLIC PARTICLES SUPPORTED ON Y-ZEOLITES [J].

DEMENORVAL, LC ;

FRAISSARD, JP ;

ITO, T .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS I, 1982, 78 :403-410

[4]

Derouane E.G., 1985, STUD SURF SCI CATAL, V20, P221

[5] THE ENERGETICS OF SORPTION BY MOLECULAR-SIEVES - SURFACE CURVATURE EFFECTS [J].

DEROUANE, EG .

CHEMICAL PHYSICS LETTERS, 1987, 142 (3-4) :200-204

[6] SURFACE CURVATURE EFFECTS IN PHYSISORPTION AND CATALYSIS BY MICROPOROUS SOLIDS AND MOLECULAR-SIEVES [J].

DEROUANE, EG ;

ANDRE, JM ;

LUCAS, AA .

JOURNAL OF CATALYSIS, 1988, 110 (01) :58-73

[7] SURFACE CURVATURE EFFECTS ON THE NMR CHEMICAL-SHIFT FOR MOLECULES TRAPPED IN MICROPOROUS SOLIDS [J].

DEROUANE, EG ;

NAGY, JB .

CHEMICAL PHYSICS LETTERS, 1987, 137 (04) :341-344

[8] INSITU CHARACTERIZATION OF CARBONACEOUS RESIDUES FROM ZEOLITE-CATALYZED REACTIONS USING HIGH-RESOLUTION SOLID-STATE C-13-NMR SPECTROSCOPY [J].

DEROUANE, EG ;

GILSON, JP ;

NAGY, JB .

ZEOLITES, 1982, 2 (01) :42-46

[9]

GEDEON A, IN PRESS ZEOLITES

[10] XE-129 NMR-STUDY OF XENON ADSORBED ON Y ZEOLITES [J].

ITO, T ;

FRAISSARD, J .

JOURNAL OF CHEMICAL PHYSICS, 1982, 76 (11) :5225-5229

← 1 2 →