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Spectroscopic studies on NiO supported on ZrO2 modified with MoO3 for ethylene dimerization

Paper ID Volume ID Publish Year Pages File Format Full-Text
44126 46004 2007 10 PDF Available
Title
Spectroscopic studies on NiO supported on ZrO2 modified with MoO3 for ethylene dimerization
Abstract

NiO supported on zirconia modified with MoO3 for ethylene dimerization was prepared by drying powdered Ni(OH)2–Zr(OH)4 with ammonium heptamolybdate aqueous solution, followed by calcining in air at high temperature. The characterization of prepared catalysts was performed using FTIR, Raman, XRD, and DSC. MoO3 equal to or less than 15 wt% was dispersed on the surface of catalyst as two-dimensional polymolybdate or monomolybdate, while for MoO3 above 15 wt%, a crystalline orthorhombic phase of MoO3 was formed, showing that the critical dispersion capacity of MoO3 on the surface of catalyst is 0.18 g/g NiO–ZrO2 on the basis of XRD analysis. From 600 °C of calcination temperature, zirconium molybdenum oxide, Zr(MoO4)2 was formed due to the reaction between ZrO2 and MoO3; its amount increased with the calcination temperature. The acid amount and the catalytic activity of catalysts increased with the amount of dispersed MoO3. The high acid strength and acid amount was responsible for the MoO bond nature of the complex formed by the interaction between MoO3 and ZrO2. The catalytic activity for ethylene dimerization was correlated with the acid amount of the catalysts measured by the ammonia chemisorption method.

Graphical abstractNiO supported on zirconia modified with MoO3 for ethylene dimerization was prepared by the impregnation method using an aqueous solution of ammonium heptamolybdate. MoO3 equal to or less than 15 wt% was dispersed on the surface of catalyst as two-dimensional polymolybdate or monomolybdate. The acid amount and the catalytic activity of catalysts increased with the amount of dispersed MoO3. The high acid strength and acid amount was responsible for the MoO bond nature of the complex formed by the interaction between MoO3 and ZrO2. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
NiO–ZrO2/MoO3 catalyst; Ethylene dimerization; Acidic properties; MoO3 dispersion; Modification with MoO3
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Spectroscopic studies on NiO supported on ZrO2 modified with MoO3 for ethylene dimerization
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 317, Issue 2, 7 February 2007, Pages 216–225
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