fulltext.study @t Gmail

Quantitative analysis of active oxygen for soot oxidation over Ag/ZrO2: Characterization with temperature-programmed reduction by NH3

Paper ID Volume ID Publish Year Pages File Format Full-Text
46154 46430 2012 6 PDF Available
Title
Quantitative analysis of active oxygen for soot oxidation over Ag/ZrO2: Characterization with temperature-programmed reduction by NH3
Abstract

Active oxygen species for soot oxidation over Ag/ZrO2 were characterized by means of X-ray photoelectron spectroscopy (XPS) and temperature-programmed desorption and reduction methods. The temperature-programmed surface reaction (TPSR) between carbon black (CB), a model soot, and surface oxygen revealed that two kinds of adsorbed oxygen species were involved in CB oxidation over Ag/ZrO2. The results of XPS, temperature-programmed desorption of O2, and temperature-programmed reduction by H2 were insufficient to distinguish the two kinds of active oxygen species. Temperature-programmed reduction by NH3 (NH3-TPR) resulted in N2 and N2O formation as products of reduction of the Ag/ZrO2 surface and bulk oxygen. The N2O formation profile in NH3-TPR exhibited two peaks, corresponding to two kinds of oxygen species having a strong oxidation capacity. The effect of Ag loading on the total amount of N2O formation was in good agreement with that on the amount of active oxygen species observed by TPSR-CB. We concluded that NH3-TPR was an appropriate technique for quantitative characterization of the amount of active oxygen species for soot oxidation on Ag/ZrO2.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights▸ There are two kinds of active oxygen species for soot oxidation on Ag/ZrO2. ▸ Temperature-programmed reduction by NH3 revealed the existence of oxygen having strong oxidation capacity. ▸ N2O formation in NH3-TPR reflected the amount of active oxygen for soot oxidation.

Keywords
Soot; Oxidation; Ag; ZrO2; H2-TPR; NH3-TPR
First Page Preview
Quantitative analysis of active oxygen for soot oxidation over Ag/ZrO2: Characterization with temperature-programmed reduction by NH3
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: Applied Catalysis B: Environmental - Volumes 123–124, 23 July 2012, Pages 351–356
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