Journal
APPLIED CATALYSIS A-GENERAL
Volume 515, Issue -, Pages 16-24Publisher
ELSEVIER
DOI: 10.1016/j.apcata.2016.01.036
Keywords
Ammonia synthesis; Cobalt catalyst; Promoter; Lanthanum content
Categories
Funding
- National Centre for Research and Development within the Applied Research Programme [PBS2/A1/13/2014]
Ask authors/readers for more resources
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 g(co)(-1)). The characterization studies included a determination of properties of the catalysts precursors (N-2 physisorption, XRPD), as well as the catalysts in the active form (TPR-MS, XRPD, SEM-EDX and H-2 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 degrees C, H-2/N-2 = 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. (C) 2016 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available