Spinel AFe2O4 Catalysts: Preparation and Catalytic Combustion of Toluene

doi:10.15541/jim20160705

Abstract

Abstract:

Nanocrystalline AFe₂O₄(A=Cu, Co, Ni, Mg, Zn) ferrite spinel catalysts were prepared by Sol-Gel auto-combustion method. In order to investigate the influence of A sites in AFe₂O₄ spinel catalysts, the catalytic combustion of toluene was investigated, and the catalysts were characterized by XRD, N₂ adsorption-desorption, SEM, TEM, H₂-TPR, and XPS. It was found that AFe₂O₄ catalysts have excellent catalytic activity. Among the catalysts, the CuFe₂O₄ catalyst obtains the highest catalytic activity, and its light-off temperature (T₅₀) and the complete combustion temperature (T₉₀) of toluene were 188℃ and 239℃, respectively. And AFe₂O₄ catalysts have obviously lamellar spinel crystal structure and the multilevel pore structures with prevalence to mesoporous, which will improve the catalytic activity of the catalysts. It is concluded that the elements of A site on AFe₂O₄ have great influence on catalytic combustion activity. The H₂ reduction temperature is only 289℃, when A site was occupied by Cu. CuFe₂O₄ has crystal lattice volume of 0.294 nm³ with CuO and α-Fe₂O₃ formed in the crystal. The concentration of electrophilic oxygen and oxygen vacancy in all oxygens (O_ele/O_1S) is 36%. Lamellar trans spinel crystal lattice, the synergies of trans spinel CuFe₂O₄ with CuO and α-Fe₂O₃, and the multilevel pore structures with prevalence to mesoporous are the main reasons for the catalytic activity improvement of CuFe₂O₄.

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Key words: spinel, VOCs, catalytic combustion, ferrite

CLC Number:

O643

WANG Yong-Qiang, XUE Rui, ZANG Meng, LIU Min-Min, CHEN Xi, ZHAO Chao-Cheng. Spinel AFe₂O₄ Catalysts: Preparation and Catalytic Combustion of Toluene[J]. Journal of Inorganic Materials, 2017, 32(10): 1068-1074.

Figures/Tables 8

Fig. 1 Flow chart of fixed bed catalytic combustion

Fig. 2 Catalytic combustion curves of toluene over AFe2O4

Fig. 3 XRD patterns of AFe2O4

Table 1 Crystalline and porous structure parameters of AFe2O4

Sample	S_BET/(m²·g^-1)	Pore size/nm	Pore volume/(cm³·g^-1)	Space group	Crystallite size/nm	Cell volume/nm³
MgFe₂O₄	21.5	19.8	0.11	Fd-3m	41.6	0.59057
ZnFe₂O₄	19.4	22.4	0.12	Fd-3m	31.5	0.60265
CuFe₂O₄	10.5	23.0	0.06	I4₁/amd	44.5	0.29402
CoFe₂O₄	15.1	19.7	0.07	Fd-3m	46.3	0.59099
NiFe₂O₄	5.4	21.9	0.03	Fd-3m	44.0	0.57966

Fig. 4 Pore size distribution curves of AFe2O4

Fig. 5 SEM (a) and TEM (b) images of CuFe2O4

Fig. 6 Full XPS spectrum (a) and O1s spectrum (b) of CuFe2O4

Fig. 7 H2-TPR spectra of AFe2O4

References 30

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Spinel AFe₂O₄ Catalysts: Preparation and Catalytic Combustion of Toluene

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