fulltext.study @t Gmail

Promotion effect of lanthanum on the Co/La/Ba ammonia synthesis catalysts—the influence of lanthanum content

Paper ID Volume ID Publish Year Pages File Format Full-Text
38858 45794 2016 9 PDF Available
Title
Promotion effect of lanthanum on the Co/La/Ba ammonia synthesis catalysts—the influence of lanthanum content
Abstract

•A new system consisting of cobalt, lanthanum and barium works effectively in NH3 synthesis.•Lanthanum content has a strong influence on the catalytic properties of the studies systems.•Lanthanum plays the role of an effective structural promoter.

The effect of lanthanum content on catalytic properties of cobalt catalysts for ammonia synthesis has been studied. The amount of La in the studied catalysts ranged from 0 to 55.7 wt.%, whereas the barium content was constant (approx. 1.5 mmol gCo−1). The characterization studies included a determination of properties of the catalysts precursors (N2 physisorption, XRPD), as well as the catalysts in the active form (TPR-MS, XRPD, SEM-EDX and H2 chemisorption). The activity of the obtained Co/La/Ba catalysts in NH3 synthesis was tested in a flow differential reactor operating under conditions close to the industrial ones (p = 6.3 MPa, T = 400 °C, H2/N2 = 3:1). It has been found that lanthanum plays the role of an effective structural promoter. However, there is a strong correlation between the La content in the catalysts and their properties: increasing amount of lanthanum is accompanied by the improvement in textural properties of both the precursors and catalysts in the reduced form. Lanthanum does not work as an activator for the cobalt surface. The increase in the activity of Co/La/Ba catalysts was observed as a result of a development of the active phase surface by increasing the La content.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (140 K)Download as PowerPoint slide

Keywords
Ammonia synthesis; Cobalt catalyst; Promoter; Lanthanum content
First Page Preview
Promotion effect of lanthanum on the Co/La/Ba ammonia synthesis catalysts—the influence of lanthanum content
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 A: General - Volume 515, 10 April 2016, Pages 16–24
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