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Facile Fabrication of Hollow Li₃PO₄ Catalyst via Ostwald Ripening

Department of Chemical Engineering, Nanjing University of Science and Technology, 200 Xiaolingwei Road, Nanjing 210094, P. R. China

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Dongyu Wang

Department of Chemical Engineering, Nanjing University of Science and Technology, 200 Xiaolingwei Road, Nanjing 210094, P. R. China

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Weihua Ma

http://orcid.org/0000-0002-5052-3884

Department of Chemical Engineering, Nanjing University of Science and Technology, 200 Xiaolingwei Road, Nanjing 210094, P. R. China

E-mail Address: maweihuacn@163.com

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https://doi.org/10.1142/S1793292018500042Cited by:1 (Source: Crossref)

Abstract

Hollow inorganic nanostructures are important due to their applications in energy storage and conversion, catalysis, gas sensing, and biomedicine. Li₃PO₄ is used as an isomerization catalyst for propylene oxide to selectively give allyl alcohol. We used a facile template-free method to synthesize hollow Li₃PO₄ nanoparticles with size range of 500nm to 1500nm. The effect of concentration, agitation, ripening temperature and the ratio of starting reagents on the hollowing process is investigated. The most important factor to influence the hollowness was found to be the ratio of lithium ion to phosphate ion; as the ratio increases, the hollowness of the particles increases. When this ratio reached 3, the hollow nanostructures become dominant. As an isomerization catalyst for propylene oxide, 4-Li₃PO₄ exhibited the highest conversion and best selectivity of allyl alcohol. The hydroxide ion of the precursor is adsorbed on the surface of the Li₃PO₄ particles which results in different surface basicity.

Keywords:

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