Abstract
The aim of this study was the synthesis of silica hollow spheres-based materials doped with metal nanoparticles or metal oxides. Two different strategies based on the use of polymer colloids and cetyltrimethylammonium bromide (CTAB) as dual templates were developed. The first strategy involves the use of soap-free emulsion polymerization for the trapping of metal nanoparticles (Ag and Ni) and in the polymer structure. The second strategy exploited carboxyl groups present on the surface of the polymer particles for the adsorption of metal salts (Ni and Fe). A complete porous SiO2 shell was generated around the polymer colloids using a Stöber method and CTAB to guide the silica shell growth. The obtained silica hollow sphere displayed either yolk-shell distribution of the doping elements or a uniform oxide deposit on the interior surface of the silica capsules. The versatility of the synthesis method and the catalytic performance of the materials were demonstrated in the case of Fe@SiO2 for a Fischer-Tropsch process.
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Funding
Aurel Diacon and Adrian Trifan acknowledge the financial support received from the Competitiveness Operational Programme 2014–2020, Action 1.1.4 Attracting high-level personnel from abroad in order to enhance the RD capacity, project: P_37_471, “Ultrasonic/Microwave Nonconventional Techniques as new tools for nonchemical and chemical processes,” financed by contract: 47/05.09.2016.
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DLS analysis of SiO2 hollow particles; EDAX mapping of FexOy@SiO2 particles, BET adsorption/desorption isotherms for SiO2 hollow particles and FexOy@SiO2 particles and a short video presenting the retention of catalytic activity for Fe0@SiO2 after testing, which is demonstrated by ignition of the catalyst once exposed to air (demonstrating the pyrophoric characteristic of Feo). (MP4 2385 kb)
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Diacon, A., Rusen, E., Trifan, A. et al. Preparation of metal and metal oxide doped silica hollow spheres and the evaluation of their catalytic performance. Colloid Polym Sci 298, 1401–1410 (2020). https://doi.org/10.1007/s00396-020-04722-4
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DOI: https://doi.org/10.1007/s00396-020-04722-4