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Synthesis and higher catalytic property of the novel bimetallic Ni–Fe/SiO2 microspheres with mesoporous structure

Published online by Cambridge University Press:  07 February 2017

Xinzhi Sun  and
Fanglin Du
Xinzhi Sun
Affiliation:
College of Chemistry and Pharmaceutical Science, Qingdao Agricultural University, Qingdao 266109, China; and Key Laboratory of Nanostructured Materials, College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
Fanglin Du*
Affiliation:
Key Laboratory of Nanostructured Materials, College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
*
a) Address all correspondence to this author. e-mail: dufanglin@qust.edu.cn
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Abstract

Bimetallic catalyst Ni–Fe/SiO2 microspheres were obtained by reducing bimetallic (Ni,Fe2+)3Si2O5(OH)4 microspheres with controllable morphology structure in situ under the hydrogen atmosphere at 650 °C, which are synthesized via one-step self-template method under hydrothermal conditions. The TEM images indicate the formation process of the different morphology and the synthesis conditions of bimetallic Ni–Fe silicate were obtained. Bimetallic catalyst Ni–Fe/SiO2 (reduced) hollow microspheres had the smaller surface area and the bigger pore diameter than that of (Ni,Fe2+)3Si2O5(OH)4 (unreduced) hollow microspheres because the reduction reaction under high temperature may make part pores in nanosheets collapsing and metal particles aggregating easily for the strong magnetism. For synergistic effect of nickel ion and iron ion, the reaction conditions of the chosen catalyst with higher activity were decreased from 140 °C–24 h + 180 °C −12 h for iron silicate hydroxide to 140 °C–12 h. Ni–Fe/SiO2 core-shell microspheres exhibited excellent catalytic activity with a conversion of nitrobenzene reaching 94% within 2 h, which is 82% higher than Fe/SiO2.

Keywords

chemical synthesiscatalytichydrogenation
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 4 , 28 February 2017 , pp. 766 - 774
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Akira Nakajima

References

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