ON THE NATURE OF THE SITES RESPONSIBLE FOR THE ENHANCEMENT OF THE CRACKING ACTIVITY OF HZSM-5 ZEOLITES DEALUMINATED UNDER MILD STEAMING CONDITIONS .2.

被引：48

作者：

ZHOLOBENKO, VL ^{[1
]}

KUSTOV, LM ^{[1
]}

KAZANSKY, VB ^{[1
]}

LOEFFLER, E ^{[1
]}

LOHSE, U ^{[1
]}

OEHLMANN, G ^{[1
]}

机构：

[1] ACAD SCI GDR,CENT INST PHYS CHEM,O-1086 BERLIN,GERMANY

来源：

ZEOLITES | 1991年 / 11卷 / 02期

关键词：

MILD DEALUMINATION; HZSM-5; ZEOLITES; PARAFFIN CRACKING; LEWIS ACIDIC SITES;

D O I：

10.1016/0144-2449(91)80406-P

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：

New data on n-hexane cracking catalyzed by HZSM-5 zeolites dealuminated under mild steaming conditions were discussed. They supported the earlier hypothesis on the dehydrogenating role of Lewis acidic sites in the initial stages of the cracking reactions. Higher yields of H-2 were found for dealuminated HZSM-5 zeolites as compared with the fresh catalyst. The addition of 1-hexene to n-hexane as a feed led to an enhancement of the activity of the fresh zeolite, whereas it had just the opposite effect on the activity of dealuminated samples. The mechanism of paraffin cracking that involved both Lewis and Bronsted acidic sites was discussed.

引用

页码：132 / 134

页数：3