SURFACE-PROPERTIES OF MOLYBDENUM-IMPREGNATED ZSM-5 CATALYSTS

被引：35

作者：

AGUDO, AL ^{[1
]}

BENITEZ, A ^{[1
]}

FIERRO, JLG ^{[1
]}

PALACIOS, JM ^{[1
]}

NEIRA, J ^{[1
]}

CID, R ^{[1
]}

机构：

[1] UNIV CONCEPCION, FAC CIENCIAS, CONCEPCION, CHILE

来源：

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1992年 / 88卷 / 03期

关键词：

D O I：

10.1039/ft9928800385

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：

Molybdena-containing H-ZSM5 zeolites have been prepared and used in the hydrodesulfurization of thiophene and dibenzothiophene model compounds. The catalysts containing 3 and 6% MoO3 were prepared by aqueous impregnation with ammonium heptamolybdate, followed by calcination at 383, 623 and 773 K. They have been characterized by X-ray diffraction (XRD), infrared spectroscopy (FTIR), temperature-programmed reduction (TPR), and scanning electron microscopy (SEM). The set of data indicated that the zeolite crystallinity is mostly preserved for the high Mo-containing catalysts, and that most of the molybdena appears as MoO3 crystals on the external zeolite surface. The appearance of MoS2 structures produced by sulfidation has already been observed by X-ray photoelectron spectroscopy (XPS) and FTIR spectroscopy of an NO probe molecule. These also showed a better dispersion for the low Mo-containing catalysts. All these data and activity data are jointly discussed.

引用

页码：385 / 390

页数：6

共 31 条

[1]

AGUDO AL, 1984, B SOC CHIM BELG, V93, P719

[2] STABILITY AND CATALYTIC PROPERTIES OF MO-CONTAINING Y-TYPE ZEOLITE CATALYSTS CALCINED BY AN ISOBARIC THERMAL-DECOMPOSITION PROCEDURE [J].