US EPA

4276243 

Journal Article 

Spinel AFe(2)O(4) Catalysts: Preparation and Catalytic Combustion of Toluene 

Wang Yong-Qiang; Xue Rui; Zang Meng; Liu Min-Min; Chen Xi; Zhao Chao-Cheng 

2017 

1 

Wuji Cailiao Xuebao
ISSN: 1000-324X 

SCIENCE PRESS 

BEIJING 

32 

10 

1068-+ 

10.15541/jim20160705 

WOS:000411392700010 

Nanocrystalline AFe(2)O(4)(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 AFe(2)O(4) spinel catalysts, the catalytic combustion of toluene was investigated, and the catalysts were characterized by XRD, N-2 adsorption-desorption, SEM, TEM, H-2-TPR, and XPS. It was found that AFe(2)O(4) catalysts have excellent catalytic activity. Among the catalysts, the CuFe2O4 catalyst obtains the highest catalytic activity, and its light-off temperature (T-50) and the complete combustion temperature (T-90) of toluene were 188 degrees C and 239 degrees C, respectively. And AFe(2)O(4) 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 AFe(2)O(4) have great influence on catalytic combustion activity. The H-2 reduction temperature is only 289 degrees C, when A site was occupied by Cu. CuFe2O4 has crystal lattice volume of 0.294 nm(3) with CuO and alpha-Fe2O3 formed in the crystal. The concentration of electrophilic oxygen and oxygen vacancy in all oxygens (Oe(le)/O-1S) is 36%. Lamellar trans spinel crystal lattice, the synergies of trans spinel CuFe2O4 with CuO and alpha-Fe2O3, and the multilevel pore structures with prevalence to mesoporous are the main reasons for the catalytic activity improvement of CuFe2O4. 

spinel; VOCs; catalytic combustion; ferrite