The adsorption of VO(acac)2 on a mesoporous silica support by liquid phase and gas phase modification to prepare supported vanadium oxide catalysts

被引：36

作者：

Baltes, M ^{[1
]}

Van Der Voort, P ^{[1
]}

Collart, O ^{[1
]}

Vansant, EF ^{[1
]}

机构：

[1] Univ Instelling Antwerp, Dept Chem, Inorgan Chem Lab, B-2610 Wilrijk, Belgium

来源：

JOURNAL OF POROUS MATERIALS | 1998年 / 5卷 / 3-4期

关键词：

mesoporous silica; vanadium oxide catalyst; VO(acac)(2);

D O I：

10.1023/A:1009694523971

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Supported vanadium oxide catalysts are prepared by adsorption and subsequent calcination of the vanadyl acetylacetonate complex on silica by liquid phase and gas phase modification. The influence of the pretreatment temperature and the effect of the solvent in the liquid phase are discussed. Two types of gas phase deposition processes are used: flow-type reactions and vacuum deposition. The bonding mechanism, the influence of pretreatment temperature of the support and the influence of the reaction temperature are investigated by FTIR, XRD, TGA and chemical analysis. After calcination the obtained vanadium oxide layer is characterized by XRD and UV-Vis diffuse reflectance spectroscopy. The gas phase modification enables the creation of well dispersed supported VOx catalysts. Loadings up to 1.4 mmol g(-1) (7 wt% V) without the formation of a crystalline fraction can be achieved. The selective oxidation of methanol to formaldehyde is used as a probe reaction to assess the catalytic activity and selectivity of the catalysts. It is shown that not the concentration of vanadium species, but their surface configuration is the determining factor in catalytic reactions.

引用

页码：317 / 324

页数：8

共 13 条

[1] Thermal transformations of chromium acetylacetonate on silica surface [J].

Babich, IV ;

Plyuto, YV ;

VanderVoort, P ;

Vansant, EF .

JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1997, 189 (01) :144-150

[2] CHEMISORPTION OF CHROMIUM ACETYLACETONATE ON POROUS HIGH-SURFACE-AREA SILICA [J].

HAUKKA, S ;

LAKOMAA, EL ;

SUNTOLA, T .

APPLIED SURFACE SCIENCE, 1994, 75 :220-227

[3] PREPARATION AND CHARACTERIZATION OF SUPPORTED MONONUCLEAR METAL-COMPLEXES AS MODEL CATALYSTS [J].

KENVIN, JC ;

WHITE, MG ;

MITCHELL, MB .

LANGMUIR, 1991, 7 (06) :1198-1205

[4] SPECTROSCOPIC INVESTIGATION OF THE STRUCTURE OF SILICA-SUPPORTED VANADIUM-OXIDE CATALYSTS AT SUBMONOLAYER COVERAGES [J].

SCHRAMLMARTH, M ;

WOKAUN, A ;

POHL, M ;

KRAUSS, HL .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1991, 87 (16) :2635-2646

[5] SPECIAL DATA HANDLING TECHNIQUES FOR FOURIER-TRANSFORM INFRARED PHOTOACOUSTIC SPECTRA - ESTIMATION AND CHARACTERIZATION OF THE N-CONTENTS ON AMMONIATED TRICHLOROSILYLATED SILICA-GEL, USING PARTIAL LEAST-SQUARES REGRESSION AND CURVE FITTING ON THE SI-H STRETCHING VIBRATION [J].

VANDERVOORT, P ;

SWERTS, J ;

VRANCKEN, KC ;

VANSANT, EF ;

GELADI, P ;

GROBET, P .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1993, 89 (01) :63-68

[6] Synthesis and characterization of supported vanadium oxides by adsorption of the acetylacetonate complex [J].

VanDerVoort, P ;

Babitch, IV ;

Grobet, PJ ;

Verberckmoes, AA ;

Vansant, EF .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1996, 92 (19) :3635-3642

[7] Preparation of supported vanadium oxide catalysts - Adsorption and thermolysis of vanadyl acetylacetonate on a silica support [J].

VanderVoort, P ;

Possemiers, K ;

Vansant, EF .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1996, 92 (05) :843-848

[8]

VANDERVOORT P, 1997, INTERFACE SCI, V5, P179

[9]

VANDERVOORT P, 1997, INTERFACE SCI, V5, P209

[10]

Vansant E.F., 1995, STUDIES SURFACE SCI, V93

← 1 2 →