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Synthesis of nano-Ce0.5Zr0.5O2 by absorption of ammonia into water-in-oil microemulsion in a rotor–stator reactor

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Abstract

A gas-microemulsion reaction precipitation method was employed to prepare nano-Ce0.5Zr0.5O2 by absorption of NH3 into water-in-oil (W/O) microemulsion in a rotor–stator reactor . The effects of different operating conditions including final pH of the microemulsion, reaction temperature, initial Ce3+ and Zr4+ concentration, rotation speed, and gas–liquid volumetric ratio were investigated. Nano-Ce0.5Zr0.5O2 with an average diameter of about 5.5 nm, a specific surface area of 215.6 m2/g and a size distribution of 4–8 nm was obtained under the optimum operating conditions. The as-prepared nano-Ce0.5Zr0.5O2 was loaded with Au to prepare nano-Au/Ce0.5Zr0.5O2 catalyst which was subsequently used for CO oxidation test. CO conversion rate reached 100 % at room temperature, indicating high catalytic activity of the nano-Au/Ce0.5Zr0.5O2 catalyst.

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Abbreviations

FFT:

Fast Fourier transform

HRTEM:

High-resolution transmission electron microscope

JCPDS:

Joint committee on powder diffraction standards

OP-10:

Po1yoxyethylene octylphenol ether

RSR:

Rotor-stator reactor

SMSI:

Strong-metal-support-interaction

STR:

Stirred tank reactor

TWC:

Three-way catalyst

XPS:

X-ray photoelectron spectroscope

XRD:

X-ray diffraction

J :

Nucleation rate, m3/s

S :

Degree of supersaturation

r c :

Critical radius, m

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Nos. 21276013, 20990221), and Specialized Research Fund for the Doctoral Program of Higher Education of China (No. 20130010110001).

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No conflict of interest exits in this article.

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Authors and Affiliations

  1. State Key Laboratory of Organic–Inorganic Composites, Beijing University of Chemical Technology, No. 15 Beisanhuan East Road, Beijing, 100029, People’s Republic of China

    Yingwen Li, Hongrun Wang, Moses Arowo, Baochang Sun, Jianfeng Chen & Lei Shao

  2. Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, No. 15 Beisanhuan East Road, Beijing, 100029, People’s Republic of China

    Yingwen Li, Hongrun Wang, Moses Arowo, Baochang Sun, Jianfeng Chen & Lei Shao

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  1. Yingwen Li
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  2. Hongrun Wang
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  3. Moses Arowo
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  4. Baochang Sun
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  5. Jianfeng Chen
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  6. Lei Shao
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Correspondence to Lei Shao.

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Li, Y., Wang, H., Arowo, M. et al. Synthesis of nano-Ce0.5Zr0.5O2 by absorption of ammonia into water-in-oil microemulsion in a rotor–stator reactor. J Nanopart Res 17, 51 (2015). https://doi.org/10.1007/s11051-015-2871-2

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