fulltext.study @t Gmail

Oxidative dehydrogenation of ethane to ethylene over Ni–Nb–M–O catalysts: Effect of promoter metal and CO2-admixture on the performance

Paper ID Volume ID Publish Year Pages File Format Full-Text
53308 46962 2016 8 PDF Available
Title
Oxidative dehydrogenation of ethane to ethylene over Ni–Nb–M–O catalysts: Effect of promoter metal and CO2-admixture on the performance
Abstract

•Promoters substantially influence structural and chemical properties of Ni–Nb–O solids.•Surface enrichment of Nb plays a key role on the catalytic performance.•CO2-admixture enhanced the ethylene selectivity.

Ni–Nb–O based catalysts are known for high activity and selectivity for the oxidative dehydrogenation of ethane (ODHE) to ethylene at relatively low temperatures. The parent Ni–Nb–O catalyst used in this work showed an ethylene yield of 32%. This solid was further modified by three promoters each, i.e. Cr, Mo, W, that belong to the same group of elements but showing different d-characters. This aim of such modification is to further improve activity and/or selectivity. However, the catalytic results of the doped solids revealed somewhat reduced activity compared to the parent Ni–Nb–O catalyst during ODHE. BET surface area data, reducibility, acidity characteristics as well as near-surface composition of Ni–Nb–M–O showed considerable deviations, which however depend upon the nature of promoter doped. The near-surface region Ni/Nb ratio is the key parameter for tuning the catalytic properties of the solids. Among the three modifiers used, Cr displayed relatively superior catalytic performance compared to other two yielding in an ethane conversion of 26% and an ethylene selectivity of ca. 65%. Nonetheless, the introduction of CO2-admixture into the reactant feed mixture improved the selectivity of ethylene in ODHE. Ni–Nb–Cr–O solid in particular revealed an enhanced ethylene selectivity of ca. 85% at slightly reduced ethane conversion.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (123 K)Download as PowerPoint slide

Keywords
Oxidative dehydrogenation; Ethane; Ethylene; CO2-admixture; Ni–Nb–M–O catalysts
First Page Preview
Oxidative dehydrogenation of ethane to ethylene over Ni–Nb–M–O catalysts: Effect of promoter metal and CO2-admixture on the performance
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 264, 15 April 2016, Pages 144–151
Authors
, , , ,
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