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Activity and selectivity for hydroisomerisation of n-decane over Ni impregnated Pd/H-mordenite catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
43321 45964 2008 10 PDF Available
Title
Activity and selectivity for hydroisomerisation of n-decane over Ni impregnated Pd/H-mordenite catalysts
Abstract

Nickel impregnated Pd/H-mordenite catalysts with different Ni contents were synthesised and tested for hydroisomerisation of n-decane with flow H2 gas. The XRD analysis of the catalysts showed the decrease of intensity with increase in Ni addition. The average metal particle size, measured by TEM, is also increased by increasing the Ni loading up to 0.2 wt.%. The acidity of the catalysts measured by TPD of ammonia revealed the ion-exchange of the some acid sites by Ni2+. The oxidation states of Pd and Ni were identified by XPS. The reducibility of H-mordenite supported Pd, Ni and Ni-Pd catalysts was studied by TPR. The catalytic activities of Ni containing and Ni free Pd/H-mordenite catalysts were studied and found that addition of Ni up to 0.2 wt.% over 0.1 wt.% Pd/H-mordenite, increased the n-decane conversion and isomerisation selectivity. As the Ni content exceeded 0.2 wt.%, the conversion and cracked products are found to decrease and increase. Further Ni containing Pd/H-mordenite showed increased sustainability and favoured the protonated cyclopropane (PCP) intermediate mechanism in n-decane isomerisation. It has been concluded that Ni impregnated Pd/H-mordenite showed good activity towards n-decane isomerisation where isomerized products mixture showed better octane number.

Graphical abstractNickel impregnated Pd/H-mordenite catalyst with different Ni contents (0.1–0.5 wt.%) were prepared and subjected to hydroisomerisation of n-decane in the presence of flowing H2 gas. Hydroisomerisation of n-decane was carried out in temperature range 200–450 °C and found that Ni addition up to 0.2 wt.% over 0.1 wt.% Pd/H-mordenite enhances the n-decane conversion and selectivity.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Hydroisomerisation; n-Decane; H-Mordenite; Palladium; Nickel
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Activity and selectivity for hydroisomerisation of n-decane over Ni impregnated Pd/H-mordenite catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 345, Issue 1, 31 July 2008, Pages 18–27
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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