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Direct nitrous oxide decomposition with a cobalt oxide catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
41893 45903 2010 8 PDF Available
Title
Direct nitrous oxide decomposition with a cobalt oxide catalyst
Abstract

The influence of individual components of the gas mixture, which is found directly downstream of the platinum–rhodium gauze in ammonia oxidation, i.e. nitric oxide, oxygen and water vapor, on the state of Co3O4 under high-temperature nitrous oxide decomposition conditions has been determined. A variety of characterization techniques, such as: nitrogen physisorption, XRD, XPS and TG–DTA–MS, was applied. The result of the research shows that nitric oxide is not decomposed on the catalyst and it does not influence the temperature of the beginning of Co3O4 reduction. However, the addition of NO in the feed leads to slightly higher activity of the catalyst in N2O decomposition than that obtained in a stream of 5% N2O in argon. In contrast, oxygen and water vapor influence the state of the catalyst. An addition of oxygen shifts the temperature of the beginning of Co3O4 reduction to higher temperatures. Therefore, the activity of the catalyst is significantly higher at 850 °C in the presence of oxygen than without it. In the case of lower temperatures, a negative impact of oxygen on the activity of the catalyst has been observed. Water vapor in the feed causes a decrease in the activity in the studied temperature range due to competitive chemisorption.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (33 K)Download as PowerPoint slideResearch highlights▶ Feed components influence N2O decomposition on Co3O4. ▶ Nitric oxide does not affect the catalyst state, but the reaction pathway. ▶ Water blocks the surface of Co3O4 reducing the number of available active sites. ▶ Oxygen increases the active phase content in the catalyst at 850 °C.

Keywords
Nitrous oxide decomposition; Spinel catalyst; Catalyst state; Reduction; Competitive chemisorption
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 389, Issues 1–2, 1 December 2010, Pages 165–172
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