MODIFICATION OF ISOMERIZATION ACTIVITY AND SELECTIVITY OVER SULFATED ZIRCONIA CATALYSTS

被引：0
|
作者：
SOLED, SL [1 ]
IGLESIA, E [1 ]
KRAMER, GM [1 ]
机构：
[1] UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720
来源：
ACID-BASE CATALYSIS II | 1994年 / 90卷
关键词：
D O I：
暂无
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：
Alkane isomerization over Pt/ZrO2/SO4= shows a positive hydrogen kinetic order, suggesting the reaction proceeds via chain transfer pathways, rather than by conventional bifunctional (metal-acid) sequences. Adamantane, a molecular hydride transfer agent, when added in small quantities to n-heptane feeds increases isomerization rates while inhibiting cracking reactions. The faster hydride transfer rates and accompanying shorter carbocation surface residence times decrease secondary cracking. This effect differs significantly from acid site poisoning by aromatic molecules, which decreases both isomerization and cracking rates.
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页码：531 / 536
页数：6
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