INFLUENCE OF PREPARATION CONDITIONS ON THE STRUCTURE AND CATALYTIC PROPERTIES OF SO42-/ZRO2 SUPERACID CATALYSTS

被引：189

作者：

CORMA, A

FORNES, V

JUANRAJADELL, MI

NIETO, JML

机构：

[1] Institutode Tecnología Química, U.P.V.-C.S.I.C., Universidad Politécnica, Camino de Vera s/n

来源：

APPLIED CATALYSIS A-GENERAL | 1994年 / 116卷 / 1-2期

关键词：

CATALYST CHARACTERIZATION (IR TPD); PREPARATION; SOLID SUPERACIDS; SULFATE DOPED ZIRCONIA; TEMPERATURE-PROGRAMMED DESORPTION OF AMMONIA;

D O I：

10.1016/0926-860X(94)80286-6

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：

SO42-/ZrO2 samples were prepared by impregnation of hydrous zirconium oxides with 0.5 M H2SO4 solutions. It was found that the pH of precipitation of the precursor Zr(OH), has a strong influence on the structure of crystalline ZrO2 and on the catalytic properties of the SO42-/ZrO2 for the isomerization of n-butane. The nature and strength of acid sites in SO42-/ZrO2 samples were studied by infrared spectra of absorbed pyridine and by temperature-programmed desorption (TPD) of ammonia. Acidity and catalytic results have been compared with those obtained on an acid zeolite as H-Mordenite. It has been found that infrared spectra of pyridine can not be used for the determination of the superacid character of SO42-/ZrO2 However, the NH3-TPD technique shown that in the case of SO42-/ZrO2 samples there are superacid sites in which the NH3-desorption peak appears at about 815 K. A correlation between the number of those superacid sites and the activity for the isomerization of n-butane has been observed.

引用

页码：151 / 163

页数：13

共 26 条

[1] PREPARATION OF SUPERACIDS BY METAL-OXIDES AND THEIR CATALYTIC ACTION [J].