Journal
ACS APPLIED NANO MATERIALS
Volume 4, Issue 4, Pages 3900-3910Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c00294
Keywords
alginate; pyrolysis; nanoparticles; carbon support; catalysis; Fischer-Tropsch
Funding
- Department of Chemical Engineering, Norwegian University of Science and Technology, through the Strategic Funding Program
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This study describes a method to synthesize transition-metal nanoparticles anchored on carbon supports using low-molar-mass sodium alginate, followed by a pyrolysis step. The resulting catalysts exhibit high metal loadings and activity, with pyrolyzed Fe-alginate showing particularly high Fischer-Tropsch synthesis activity.
This study reports a green, inexpensive, and highly versatile procedure to synthesize well-dispersed transition-metal nanoparticles anchored on carbon supports. The resulting metal loadings are 26 wt % or above. Achieving both these properties simultaneously has been difficult with established synthesis methods of carbon-supported metal catalysts, such as impregnation and deposition-precipitation. Herein, low-molar-mass sodium alginate with high guluronate content was ion-exchanged with transition-metal ions, followed by a pyrolysis step at 500 degrees C. The investigated transition-metal ions were Fe3+, Co2+, Ni2+, and Cu2+. The alginate's properties and interaction with the transition-metal ions greatly influenced the pyrolyzed material's characteristics, whereas the observed metal particle size was found to negatively correlate with the metal's melting point. The pyrolyzed Fe-alginate was tested as a catalyst for the Fischer-Tropsch synthesis and exhibited an iron time yield of 885 mu mol(CO) h(-1) g(-1), which is among the highest activities reported in the literature. The activity is mainly attributed to the iron nanoparticle size achieved by the reported synthesis procedure, and the improved olefin selectivity is ascribed to the sodium and sulfur that originates from the alginate and iron precursor, respectively.
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