EFFECT OF PRECIPITATION MEDIUM ON SURFACE-ACIDITY AND CATALYTIC PERFORMANCE OF CHROMIUM ORTHOPHOSPHATES IN CYCLOHEXENE SKELETAL ISOMERIZATION AND CUMENE CONVERSION

被引：15

作者：

BAUTISTA, FM ^{[1
]}

CAMPELO, JM ^{[1
]}

GARCIA, A ^{[1
]}

LUNA, D ^{[1
]}

MARINAS, JM ^{[1
]}

URBANO, MR ^{[1
]}

机构：

[1] CORDOBA UNIV,FAC SCI,DEPT ORGAN CHEM,AVDA S ALBERTO MAGNO SN,E-14004 CORDOBA,SPAIN

来源：

JOURNAL OF MATERIALS CHEMISTRY | 1993年 / 3卷 / 09期

关键词：

CHROMIUM ORTHOPHOSPHATE; SURFACE ACIDITY; CYCLOHEXENE ISOMERIZATION; CUMENE CRACKING;

D O I：

10.1039/jm9930300975

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：

The influence of the precipitation medium and thermal treatment of CrPO4 (Cr: P= 1) catalysts on their surface acidity (number and strength distribution) was studied by means of the gas-phase chemisorption of pyridine (PY) and 2,6-dimethylpyridine (DMPY) at 573 and 673 K. In addition, cyclohexene skeletal isomerization (CSI) and cumene conversion (CC), were selected as dynamic methods for surface acid characterization. Catalysts obtained in propylene oxide-aqueous ammonia exhibited a higher number and strength of acid sites and, hence, greater activity in CSI and CC processes, than catalysts obtained in propylene oxide or aqueous ammonia exclusively. Moreover, cumene dehydrogenation (to alpha-methylstyrene) always predominated over cumene dealkylation (to propylene and benzene) and accounted for 100% selectivity of CrP-A and CrP-P catalysts. Furthermore, a correlation between surface acidity and catalytic activity was found.

引用

页码：975 / 978

页数：4