CoNi alloy catalyst supported on Zr-modified Y2O3 for ammonia decomposition to COx-free hydrogen

Li, Chaojie; Guo, Lexin; Chen, Guanghui; Fu, Yaqian; Zhang, Xiaoxu; Zou, Yuanqiang; Duan, Jihai; Wang, Weiwen

doi:10.1016/j.colsurfa.2023.131671

Cited by 2 publications

(4 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fu et al [13] and Li et al [14] analysed the influence of the strength of the metalammonia bond (M-NH3) on the efficiency of the ammonia decomposition to hydrogen and nitrogen. In the case of a too-weak M-NH3 bond, desorption of ammonia is more likely than its dehydrogenation.…”

Section: Sample Namementioning

confidence: 99%

“…Therefore, the search for non-ruthenium catalysts with high activity, high stability, and low cost has attracted significant attention from scientists and engineers. Co-and Ni-based catalysts have been reported to be the most promising alternatives to Ru-based ones [12][13][14][15]. The very important role of supports used for cobalt and nickel deposition in determining the efficiency of ammonia decomposition has been reported [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…Co-and Ni-based catalysts have been reported to be the most promising alternatives to Ru-based ones [12][13][14][15]. The very important role of supports used for cobalt and nickel deposition in determining the efficiency of ammonia decomposition has been reported [12][13][14][15]. The supports may increase the density of active centres, influence the dispersion of metal nanoparticles and their stability and may modify surface chemistry to facilitate the diffusion of intermediate species under reaction conditions [16].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, a too-strong M-N binding energy is suitable for dissociative adsorption of ammonia but it is unfavorable for recombination of N atoms and desorption of N2 molecules. Recombination of N atoms has also been attributed to the size of metal species dispersed on the support surface, especially at the metal-support interfaces where the recombination process is postulated to occur [14]. Thus, the selection of catalytically active metal components, as well as the appropriate support, is a crucial issue in designing catalysts for ammonia decomposition.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Synergistic Effect of Co and Ni Co-Existence on Catalytic Decomposition of Ammonia to Hydrogen—Effect of Catalytic Support and Mg-Al Oxide Matrix

Kowalczyk,

Rutkowska,

Gnyla

et al. 2024

ChemEngineering

View full text Add to dashboard Cite

Hydrotalcite-derived mixed metal oxides containing Co and Ni and containing these metals supported on MgO and Al2O3 were prepared and tested as catalysts for the decomposition of ammonia to hydrogen and nitrogen. The obtained samples were characterised in terms of chemical composition (ICP-OES), structure (XRD), textural parameters (low-temperature N2 adsorption–desorption, SEM), form and aggregation of transition-metal species (UV-Vis DRS), reducibility (H2-TPR) and surface acidity (NH3-TPD). The catalytic efficiency of the tested systems strongly depends on the support used. Generally, the alumina-based catalyst operated at lower temperatures compared to transition metals deposited on MgO. For both series of catalysts, a synergistic effect of the co-existence of cobalt and nickel on the catalytic efficiency was observed. The best catalytic results were obtained for hydrotalcite-derived catalysts; however, in the case of these catalysts, an increase in the Al/Mg ratio resulted in a further increase in catalytic activity in the decomposition of ammonia.

show abstract

Section: Sample Namementioning

confidence: 99%