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Selective ring-opening of methylcyclopentane on platinum-based bimetallic catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
42276 45918 2009 9 PDF Available
Title
Selective ring-opening of methylcyclopentane on platinum-based bimetallic catalysts
Abstract

Several monometallic catalysts supported on alumina were tested in methylcyclopentane ring-opening under pressure. Among the monometallic catalysts tested (Ru, Re, Rh, Pt and Ir), iridium and rhodium catalysts were the most active but iridium was by far the most selective in ring-opening (RO) products (2-methylpentane, 3-methylpentane and n-hexane), the formation of C1–C5 products being negligible, as already reported in the literature. Thereafter, platinum-based bimetallic catalysts supported on alumina were prepared by redox surface reaction in order to favor the metal–metal interaction. The aim was to obtain bimetallic catalysts leading to selectivity towards RO products similar to that of the iridium catalyst. Two types of modifiers were studied, namely (i) inactive species such as copper and germanium and (ii) active promoters for hydrogenolysis reactions, such as ruthenium and rhodium. It was shown that with inactive metals, the parent platinum catalyst undergoes mainly a dilution of its active phase. An increase of the activity is observed for the Pt-Ru/Al2O3 systems compared to the parent one, but also an increase of the C1–C5 products. On the contrary, the addition of Rh allowed us to increase the activity of the platinum parent catalyst and to obtain bimetallic catalysts with selectivity towards RO products similar to that obtained with iridium in same conditions.

Graphical abstractThe aim of this study was to obtain platinum-based bimetallic catalysts leading to selectivity towards ring-opening (RO) products under pressure similar to that of the best monometallic iridium catalyst during methylcyclopentane (MCP) conversion. Similarly to Ir/Al2O3, and contrary to Pt/Al2O3 and Rh/Al2O3, Pt-Rh/Al2O3 catalysts are able to convert MCP selectively to RO products up to high MCP conversions.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Methylcyclopentane; Ring-opening; Bimetallic catalysts; Redox reactions
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Selective ring-opening of methylcyclopentane on platinum-based bimetallic catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 369, Issues 1–2, 15 November 2009, Pages 104–112
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us