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Chemical Precipitation Method for the Synthesis of Nb2O5 Modified Bulk Nickel Catalysts with High Specific Surface Area
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Structure Engineering of Ni/SiO2 Vegetable Oil Hydrogenation Catalyst via CeO2
Margarita Gabrovska1, Dimitrinka Nikolova1, Vojkan Radonjić2
1Institute of Catalysis, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria.
International Journal of Molecular Sciences
|July 27, 2024
Summary
Adding cerium dioxide (CeO2) to magnesium-nickel/silica (MgNi/SiO2) catalysts enhances vegetable oil hydrogenation. This modification improves catalyst activity and selectivity for specific fatty acids, optimizing the process.
Area of Science:
- Catalysis
- Materials Science
- Green Chemistry
Background:
- Nickel-based catalysts are crucial for vegetable oil hydrogenation.
- Improving the activity and selectivity of these catalysts is an ongoing challenge.
- Ceria (CeO2) modification offers a novel approach to enhance Ni/SiO2 catalyst performance.
Purpose of the Study:
- To investigate the effect of cerium dioxide (CeO2) modification on the performance of MgNi/SiO2 catalysts for vegetable oil hydrogenation.
- To explore how CeO2 influences catalyst structure, reducibility, and surface properties.
- To determine the impact of CeO2 on hydrogenation activity and selectivity towards specific fatty acids.
Main Methods:
- Synthesis of CeO2-doped MgNi/SiO2 catalysts.
- Characterization using Powder X-ray Diffraction (PXRD), SEM-EDS, XPS, HRTEM, H2-TPR, and H2-chemisorption.
- Evaluation of catalyst performance in vegetable oil hydrogenation, analyzing fatty acid composition at a target iodine value of 80.
Main Results:
- Uniform distribution and stabilization of metallic Ni particles on CeO2-modified surfaces were observed.
- CeO2 modification altered catalyst selectivity towards C18:1-cis and C18:0 fatty acids.
- Ceria addition as a catalyst dopant improved hydrogenation activity, while as a carrier modifier, it enhanced selectivity.
Conclusions:
- Structural reconstruction using 1 wt.% CeO2 effectively tunes the hydrogenation performance of Ni-based catalysts.
- Ceria's role as a carrier modifier or catalyst dopant significantly impacts selectivity and activity in vegetable oil hydrogenation.
- This study presents a novel approach for designing efficient Ni/SiO2 catalysts for partial hydrogenation of vegetable oils.
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