Ring opening of decalin over zeolites -: II.: Activity and selectivity of platinum-modified zeolites

被引:148
作者
Kubicka, D
Kumar, N
Mäki-Arvela, P
Tiitta, M
Niemi, V
Karhu, H
Sami, T
Murzin, DY [1 ]
机构
[1] Abo Akad Univ, Process Chem Ctr, Lab Ind Chem, FIN-20500 Turku, Finland
[2] Fortum Oil & Gas Oy, FIN-06101 Porvoo, Finland
[3] Univ Turku, Dept Phys, Turku 20014, Finland
关键词
ring opening; isomerization; zeolite catalysts; platinum; decalin; acidity;
D O I
10.1016/j.jcat.2004.07.015
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 activity and selectivity of platinum-modified zeolites (Beta, Y, Mordenite) were investigated in the ring opening of decalin at 473-543 K in the presence of hydrogen. In the course of decalin transformation, skeletal isomerization, stereoisomerization, ring opening, and cracking took place. The presence of platinum resulted in an enhancement of isomerization and ring-opening rates, as compared to the proton form zeolites. The isomerization and ring-opening rates increased 3 and 5 times, respectively. Hydrogen pressure was found to suppress the A secondary reactions and to prevent the catalyst deactivation. The isomerization and ring-opening reactions were not affected by hydrogen presence. Variations in catalyst deactivation were observed and attributed to different locations of organic deposits. Interactions between platinum and Bronsted acid sites suggested that the platinum crystallites were located partially in the channels of the studied zeolites. As a result of these interactions, the strength of Bronsted acid sites was reduced and consequently less cracking products were formed, at comparable conversions, over platinum-modified zeolites than over the corresponding parent zeolites. (C) 2004 Elsevier Inc. All rights reserved.
引用
收藏
页码:313 / 327
页数:15
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