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Nickel-doped small pore zeolite bifunctional catalysts: A way to achieve high activity and yields into olefins

Paper ID Volume ID Publish Year Pages File Format Full-Text
54509 47012 2014 6 PDF Available
Title
Nickel-doped small pore zeolite bifunctional catalysts: A way to achieve high activity and yields into olefins
Abstract

•Design of bifunctional Ni-zeolites.•Optimization of Ni introduction methology in FER zeolite.•Ni-HFER zeolite led to a raise in the catalytic activity for both n-hexane and isobutane cracking.

The present study deals with the modification of mordenite (HMOR) and ferrierite (HFER) zeolites by nickel. XRD, XRF, nitrogen adsorption, TPR, XANES, EXAFS were used to thoroughly characterize the materials. The metal level was set to 1 wt% for all catalysts and nickel was introduced by cationic exchange following either conventional thermal heating or in the presence of microwave radiation (HFER). The metal exchange methods employed ensured to maintain the structural integrity of the zeolites. However nickel was predominantly distributed as small NiO particles on HFER for both catalysts. The rate of both n-hexane and isobutane cracking increased when nickel was introduced under microwave radiation for HFER zeolite. Likewise, the selectivity toward ethylene and propylene was enhanced by nickel presence in n-hexane cracking reaction, while no effect on selectivity was observed in isobutane cracking. These results confirm that a new bifunctional system was obtained, since both metallic and Brønsted acid sites are acting in a synergetic manner within the zeolite catalyst.

Graphical abstractAddition of nickel to HZSM-5 increases remarkably the selectivity to ethylene and the catalysts’ catalytic activity when compared to the pristine HZSM-5. The ethylene is produced through β-scissions processes from oligomeric carbenium ions formed during the process.Figure optionsDownload full-size imageDownload high-quality image (81 K)Download as PowerPoint slide

Keywords
Nickel; Alkane; Cracking; Zeolite; Ferrierite; Bifunctional
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Nickel-doped small pore zeolite bifunctional catalysts: A way to achieve high activity and yields into olefins
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 226, 1 May 2014, Pages 67–72
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