Study on the performance of simultaneous desulfurization and denitrification of Fe3O4-TiO2 composites

Abstract

With Fe 3 O 4 as the carrier, tetrabutyl titanate as precursor, the TiO 2 was 8 wrapped on the surface of Fe 3 O 4 by hydrothermal method to synthesize the 9 Fe 3 O 4 -TiO 2 composite. X-ray powder diffraction(XRD), Transmission electron 10 microscopy (TEM) and Fourier transform infrared (FTIR) analysis showed that the 11 nano TiO 2 formed a better coating layer on the surface of Fe 3 O 4 particles. In the 12 experiment, the simulation of the SO 2 and NO of the industrial coal-fired flue gas was 13 tested respectively by Fe 3 O 4 , TiO 2 and x%Fe 3 O 4 -TiO 2 (x% represents the mass 14 fraction of Fe 3 O 4 of the total material). The results showed that the activities of TiO 2 15 and Fe 3 O 4 -TiO 2 were good, and both of them had good removal effect on SO 2 and 16 NOx. TiO 2 was wrapped on Fe 3 O 4 , which formed a special package structure, the 17 surface layer of nano TiO 2 and Fe 3 O 4 carrier can promote each other, the performance 18 of simultaneous desulfurization and denitrification can be further improved. 19 Fe 3 O 4 -TiO 2 composites with different ratio were tested at 100℃; 10% Fe 3 O 4 -TiO 2 had 20 high reaction performance; the removal effect gradually decreased with the increase 21 of Fe 3 O 4 content. The performance of 10%Fe 3 O 4 -TiO 2 composite on simultaneous 22 desulfurization and denitrification at 100℃,150℃,200℃ was in descending order. At 23 the temperature of 100℃, the removal effect of 10%Fe 3 O 4 -TiO 2 on SO 2 and NOx can 24 be maintained at 100% and 50% respectively, and it was not until after 64 min the 25 NOx was close to penetrate. The addition of H 2 O enhanced the SO 2 adsorption; and 26 the NO adsorption capacity decreased with the increase of the H 2 O content. NOx and 27 SO 2 were adsorbed on the surface of the composite material by physical and chemical 28 adsorption, the products were sulfate and nitrate according to the results of the 1 characterization. 2

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