fulltext.study @t Gmail

Effect of gadolinium on the catalytic properties of iron oxides for WGSR

Paper ID Volume ID Publish Year Pages File Format Full-Text
54784 47026 2013 8 PDF Available
Title
Effect of gadolinium on the catalytic properties of iron oxides for WGSR
Abstract

•Gd increases the specific surface area of hematite and magnetite.•Gd delays the iron carbides production during WGSR.•Gd increases the activity of iron oxide-based catalysts.

Due to the need for energy supply through cleaner and more efficient technologies, the interest for the water gas shift reaction (WGSR) has increased especially due to its role in purifying hydrogen-rich streams. In order to find alternative catalysts for this reaction, the effect of gadolinium and its amount on the properties of iron oxide-based catalysts was studied in this work. Samples with different gadolinium to iron molar ratio (0.05; 0.1 and 0.15) were prepared by sol–gel method and characterized by chemical analysis, thermogravimetry, differential scanning calorimetry, infrared spectroscopy, X-ray diffraction, Mössbauer spectroscopy, specific surface area measurements and thermoprogrammed reduction. The catalysts were evaluated in WGSR at 1 atm in the range of 250–400 °C. Hematite and gadolinium ferrite were detected for all fresh catalysts based on iron and gadolinium while magnetite and iron carbides and gadolinium oxide were found for the spent ones. The specific surface area increased due to gadolinium, related to its role as spacer. Gadolinium made the reduction of Fe3+ and Fe2+ species more difficult for all catalysts and then inhibited the production of iron carbides during reaction, increasing the activity. The catalyst with Gd/Fe = 0.10 showed the highest activity that was assigned to its highest specific surface area, which exposed more active sites. No methane or ethane was found indicating that the iron carbides were inactive to Fischer–Tropsch synthesis under reaction conditions.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (202 K)Download as PowerPoint slide

Keywords
Hydrogen; WGSR; Gadolinium ferrite; Hematite; Magnetite; Iron carbide
First Page Preview
Effect of gadolinium on the catalytic properties of iron oxides for WGSR
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 213, 15 September 2013, Pages 127–134
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