Influence of Ru Substitution on the Properties of LaCoO 3 Catalysts for Ammonia Synthesis: XAFS and XPS Studies
Abstract
In the present work, LaCo 1– x Ru x O 3 perovskites ( x = 0, 0.01, and 0.02) were synthesized, and the influences of the partial substitution of Co by Ru on the reducibility and structural properties of LaCoO 3 perovskite were investigated by XRD, TPR, XPS, STEM, and XAFS techniques. The results indicate that Ru is incorporated into the LaCoO 3 lattice, giving rise to a decrease of mean crystallite size as well as promotion of perovskite reducibility. At 450 °C and 1 MPa, LaCo 0.98 Ru 0.02 O 3 shows an ammonia synthesis rate of 10.5 mmol/(g NH3 ·h) and insignificant decline of activity in a run of 50 h. On contrast, the ammonia synthesis rate over the Ru/LaCoO 3 counterpart prepared by wet impregnation method gradually drops from 8.05 to 7.15 mmol/(g NH3 ·h). Moreover, there is strong synergy between Ru and Co species in LaCo 0.98 Ru 0.02 O 3, affording enrichment of Ru δ+ clusters and surface Co 2+ species that are beneficial to N 2 adsorption and activation.
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In Co 2p XPS region, both MnCo2O4 spinel and LaCoMnO3 perovskite exhibit Co2+ and Co3+ signals.
“In the Co 2p region, both the MnCo2O4 spinel and the LaCoMnO3 perovskite exhibit Co2+ and Co3+ signals”
From La-Co-Mn oxide aerogels as high-performance electrocatalysts for anion exchange membrane water electrolysis (2026) · cites this paper as [43]
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Wang, P., Chang, F., Gao, W., Guo, J., Wu, G., He, T., & Chen, P. (2017) · Nature Chemistry · doi:10.1038/nchem.2595 · Cited by 711 · see citing works
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Perspective on Intensification of Haber−Bosch to Enable Ammonia Production under Milder Conditions
Lin, B., Nowrin, F. H., Rosenthal, J. J., Bhown, A. S., & Malmali, M. (2023) · ACS Sustainable Chemistry & Engineering · doi:10.1021/acssuschemeng.2c06711 · Cited by 114 · see citing works
Self-citationContreras-Martínez, M. V., Espinosa-Lagunes, F. I., Arenillas, A., Rey-Raap, N., Gatto, I., Ledesma-García, J., Baglio, V., & Arriaga, L. G. (2026) · Chemical Engineering Journal · doi:10.1016/j.cej.2026.175528 · Cited by 5 · see citing works
- Authors
- Wang, X., Peng, X., Ran, H., Lin, B., Ni, J., Lin, J., & Jiang, L.
- Affiliations
- Fuzhou University (CN)
- Corresponding author
- Ni, Jun
- Jiang, Lilong
- Venue
- Industrial & Engineering Chemistry Research
- Publisher
- American Chemical Society (ACS)
- Published
- 2018-12-14
- Volume
- 57
- Issue
- 51
- Pages
- 17375-17383
- ISSN
- 0888-5885 (ISSN-L)
- 1520-5045
- OpenAlex
- W2903913073
- Cited by
- 64
- References
- 1
- Citations by year
- 2026: 7 · 2025: 11 · 2024: 12 · 2023: 10 · 2022: 10 · 2021: 9 · 2020: 3 · 2019: 2
- FWCI
- 0.84
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Industrial & Engineering Chemistry Research (publishedVersion)
- Funders
- Natural Science Foundation of Fujian Province (2018J10691)
- National Natural Science Foundation of China (21703037)
- Fujian Province (21825801, 2017H0049)
- Topics
- Physical Sciences › Chemical Engineering › Catalysis › Ammonia Synthesis and Nitrogen Reduction
- Physical Sciences › Materials Science › Materials Chemistry › Catalytic Processes in Materials Science
- Physical Sciences › Chemical Engineering › Catalysis › Catalysts for Methane Reforming
- Keywords
- LaCoO3, ruthenium substitution, perovskite catalysts, ammonia synthesis, reducibility, crystallite size, nitrogen adsorption, N2 activation, wet impregnation, catalyst deactivation, X-ray absorption spectroscopy, X-ray photoelectron spectroscopy
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