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Methanol decomposition on electrospun zirconia nanofibers

Paper ID Volume ID Publish Year Pages File Format Full-Text
55384 47050 2012 11 PDF Available
Title
Methanol decomposition on electrospun zirconia nanofibers
Abstract

Electrospinning has been used for the preparation of PVP–zirconium acetate nanofibers. The obtained non-woven cloths have been calcined at different temperatures (200–1000 °C) and used as heterogeneous catalysts in the gas phase decomposition of methanol. The X-ray diffraction spectra of the zirconia nanofibers show the onset of a semicrystalline tetragonal structure for the fibers calcined at 400 °C. Transformation from tetragonal to monoclinic zirconia starts at a calcination temperature between 600 and 800 °C. SEM and TEM images of the zirconia nanofibers show fibers with a high aspect ratio and sizes as thin as 200 nm. The increase of the calcination temperature results in zirconia fiber catalysts with lower methanol steady state conversions, probably due to changes in the crystalline phase and crystal sintering. The fibers calcined at 500 °C yielded the highest methanol conversion and selectivities to dimethyl ether. In general trend, methanol dehydrates to dimethyl ether at the lower reaction temperatures and decomposes to hydrogen and carbon monoxide at the higher reaction temperatures. Deactivation of the catalyst is observed only at the highest reaction temperature, being probably related to deposition over the fiber surface of pyrolytic carbon from cracking reaction of dimethyl ether.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (252 K)Download as PowerPoint slideHighlights► Zirconia nanofiber as catalysts for methanol decomposition. ► Catalytic conversion strongly depends on the catalyst calcination temperature. ► Catalyst calcined at 500 °C shows the highest selectivity to DME. ► Selectivity to DME favored at reaction temperatures lower than 400 °C. ► Catalyst calcined at 800 °C shows the highest selectivity to syngas.

Keywords
Methanol decomposition; Zirconia; Electrospinning; Nanofibers; Heterogeneous catalysis
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 187, Issue 1, 30 June 2012, Pages 77–87
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
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