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

David Kubička, Narendra Kumar, Päivi Mäki-Arvela, Marja Tiitta, Vesa Niemi, Hannu Karhu, Tapio Salmi, Dmitry Yu Murzin*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

140 Citations (Scopus)

Abstract

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 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 Brønsted 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 Brønsted acid sites was reduced and consequently less cracking products were formed, at comparable conversions, over platinum-modified zeolites than over the corresponding parent zeolites.

Original languageEnglish
Pages (from-to)313-327
Number of pages15
JournalJournal of Catalysis
Volume227
Issue number2
DOIs
Publication statusPublished - 25 Oct 2004
MoE publication typeA1 Journal article-refereed

Keywords

  • Acidity
  • Decalin
  • Isomerization
  • Platinum
  • Ring opening
  • Zeolite catalysts

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