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Colloidally Confined Crystallization of Highly Efficient Ammonium Phosphomolybdate Catalysts
Citation key Antonello2018
Author Antonello, Alice and Benedetti, Cesare and Pérez-Pla, Francisco F. and Kokkinopoulou, Maria and Kirchhoff, Katrin and Fischer, Viktor and Landfester, Katharina and Gross, Silvia and Muñoz-Espí, Rafael
Pages 23174-23186
Year 2018
DOI 10.1021/acsami.8b01617
Journal ACS Applied Materials & Interfaces
Volume 10
Number 27
Note PMID: 29882409
Abstract Nanodroplets in inverse miniemulsions provide a colloidal confinement for the crystallization of ammonium phosphomolybdate (APM), influencing the resulting particle size. The effects of the space confinement are investigated by comparing the crystallization of analogous materials both in miniemulsion and in bulk solution. Both routes result in particles with a rhombododecahedral morphology, but the ones produced in miniemulsion have sizes between 40 and 90 nm, 3 orders of magnitude smaller than the ones obtained in bulk solution. The catalytic activity of the materials is studied by taking the epoxidation of cis-cyclooctene as a model reaction. The miniemulsion route yields APM particles catalytically much more active than analogous samples produced in bulk solution, which can be explained by their higher dispersibility in organic solvents, their higher surface area, and their higher porosity. Inorganic phosphate salt precursors are compared with organic phosphate sources. APM nanoparticles prepared in miniemulsion from d-glucose-6-phosphate and O-phospho-dl-serine yield a conversion in the epoxidation reaction of more than 90\% after only 1 h, compared to 30\% for materials prepared in bulk solution. In addition, the catalysts prepared in miniemulsion display a promising recyclability.
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