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Performance of phase-pure M1 MoVNbTeOx catalysts by hydrothermal synthesis with different post-treatments for the oxidative dehydrogenation of ethane

Paper ID Volume ID Publish Year Pages File Format Full-Text
39122 45807 2015 8 PDF Available
Title
Performance of phase-pure M1 MoVNbTeOx catalysts by hydrothermal synthesis with different post-treatments for the oxidative dehydrogenation of ethane
Abstract

•Post-treatment effect on ODHE performance of phase-pure M1 catalysts was studied.•H2O2 treatment is effective in M1 catalyst activity and stability improvement.•M1 catalyst activity is mainly affected by V5+ and partially affected by Te content.•M1 catalyst stability is affected by Te content and reaction conditions.

Phase-pure M1 catalysts with different post-treatments have been prepared from the same precursor slurry by hydrothermal synthesis and used to study the key factors influencing their performance in the oxidative dehydrogenation of ethane (ODHE) process. Different purification processes (i.e. steam treatment and hydrogen peroxide treatment) result in different tellurium (Te) contents and V5+ concentration in the catalysts. Catalytic tests reveal that there is a direct correlation between the amount of V5+ present in the catalysts and the catalytic activity. A hydrogen peroxide treatment increases the V5+concentration and decreases the Te content which can improve the catalytic activity and stability in comparison with the steam treatment. A post-treatment with oxalic acid improves the catalyst surface area (54 m2/g) but causes some vanadium leaching. The phase-pure M1 catalyst calcined at 650 ̊C and purified by H2O2 shows the best catalyst productivity of 0.77 kgC2H4/kgcat/h0.77 kgC2H4/kgcat/h at 73% ethane conversion and 85% ethylene selectivity in ODHE process. The formation of reduced Te(0) aggregates blocking the active sites is identified as a main reason for catalyst deactivation. A low Te content favors a stable catalyst with less risk of Te aggregation. However, at harsh operating conditions (i.e. high oxygen concentration and high reactor temperature) the performance of phase-pure M1 catalysts with a low Te content can also reduce obviously due to the formation of a new (V, Nb)-substituted θ-Mo5O14 and MoO2 phases.

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Keywords
Oxidative dehydrogenation; Ethane; Ethylene; Mixed-metal oxide
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Performance of phase-pure M1 MoVNbTeOx catalysts by hydrothermal synthesis with different post-treatments for the oxidative dehydrogenation of ethane
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 498, 5 June 2015, Pages 99–106
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