Preparation of P2O5-SiO2 hollow microspheres in the presence of phosphoric acid

doi:10.1007/s11705-010-0573-y

Front Chem Sci Eng

2011, Vol. 5

Issue (3) : 314-317 https://doi.org/10.1007/s11705-010-0573-y

RESEARCH ARTICLE

Preparation of P₂O₅-SiO₂ hollow microspheres in the presence of phosphoric acid

Wenjiang LI, Fei XIE(

), Dongxu HUA, Chunli ZHANG, Chen DAI, Zhenyun YU, Meizhou QI, Shaojun YU

State Key Laboratory of Heavy Oil Processing, Key Laboratory of Catalysis, CNPC, College of Science, School of Chemistry & Chemical Engineering, China University of Petroleum, Qingdao 266555, China

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Abstract

Silica hollow microspheres containing phosphorous have been prepared by a sol-gel/emulsion method which uses tetraethoxysilane (TEOS) as the precursor for the SiO₂ and phosphoric acid (H₃PO₄) as the precursor for P₂O₅. The hollow structure forms an emulsion system which is composed of an oil phase (kerosene, sorbitan monooleate (Span 80)) and an aqueous phase (a viscous sol solution of ethanol, TEOS and H₃PO₄). Some of the phosphorous remains in the final silica shell structure even after calcination at 650°C. The hollow structure of the P₂O₅-SiO₂ (silicophosphate) was characterized by X-ray diffraction (XRD), polarized optical microscopy (POM), scanning electron microscopy (SEM), nitrogen adsorption measurement and Fourier transform infrared spectroscopy (FTIR).

Keywords P₂O₅-SiO₂ hollow microspheres sol-gel/emulsion phosphoric acid

Corresponding Author(s): XIE Fei,Email:xiefei@upc.edu.cn

Issue Date: 05 September 2011

Cite this article:

Wenjiang LI,Fei XIE,Dongxu HUA, et al. Preparation of P₂O₅-SiO₂ hollow microspheres in the presence of phosphoric acid[J]. Front Chem Sci Eng, 2011, 5(3): 314-317.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-010-0573-y
https://academic.hep.com.cn/fcse/EN/Y2011/V5/I3/314

Fig.1 XRD patterns for the sample synthesized using phosphoric acid (a) and nitric acid (b)

Fig.2 FTIR spectra of the shell samples prepared by HPO (a) and nitric acid (b)

Fig.3 Optical images of the sample calcined at 650°C for 5 h (scale bar: 100 μm)

Fig.4 SEM images of unbroken microspheres (a) and broken microspheres (b)

Fig.5 N adsorption-desorption isotherms of microspheres (a) and pore size distribution curve (b)

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