Controlled Synthesis and Catalytic Property of Mesoporous Bimetal Ni-Co/SiO2 Hollow Spheres

doi:10.15541/jim20150580

Abstract

Abstract:

Using silica as template, mesoporous bimetal Ni-Co silicate hydroxide hollow spheres were synthesized by sacrificial template/interface reaction. There morphologies and structures were characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), and temperature procedure reduction (TPR). Their reduction rule was explored and catalytic properties of the reduction products on nitrobenzene hydrogenation were investigated. The results show that the structures of bimetal nickel cobalt silicate are core-shell and hollow spheres under 140℃ for 6 h and 12 h, respectively. Bimetal Ni-Co/SiO₂ hollow spheres are obtained after reduction of N silicate hydroxide hollow spheres within 5 h at 800℃ with less specific surface area and bigger pore size than before reduction. But the hollow spheres before and after reduction still share the same morphology. Using bimetal Ni-Co/SiO₂ hollow spheres as catalyst for conversion of nitrobenzene, the conversion rate attains 67% within 1 h, about 28% higher than that of using commercial Raney Ni.

Key words: bimetal Ni-Co/SiO2 catalyst, hollow spheres, catalytic property

CLC Number:

O643

SUN Xin-Zhi, DU Fang-Lin. Controlled Synthesis and Catalytic Property of Mesoporous Bimetal Ni-Co/SiO₂ Hollow Spheres[J]. Journal of Inorganic Materials, 2016, 31(9): 923-928.

Figures/Tables 10

Fig. 1 XRD patterns of nickel cobalt silicate hydroxide

Fig. 2 TEM images of nickel cobalt silicate hydroxide after reaction for 6 h (a) and 12 h (b)

Fig. 3 TEM images of nickel cobalt silicate hydroxide (a), cobalt silicate hydroxide (b) and nickel silicate hydroxide (c)

Fig. 4 Preparation processing of the Ni-Co silicate hollow spheres

Fig. 5 H2-TPR profiles of nickel (a), cobalt (b) and nickel/cobalt (c) silicate hydroxide

Fig. 6 H2-TPR profiles of the products prepared at 6 h (a) and 12 h (b)

Fig. 7 XRD patterns of the reduced samples

Fig. 8 TEM images of Ni-Co silicate hydroxide before (a) and after (b) reduction

Fig. 9 N2 adsorption-desorption isotherms and pore diameter distribution of the samples

Fig. 10 Conversion of nitrobenzene using different catalysts

References 20

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Controlled Synthesis and Catalytic Property of Mesoporous Bimetal Ni-Co/SiO₂ Hollow Spheres

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