Desulfurization Performance of Rare Earth Mono-substituted Heteropoly Compounds
Xiaoning Pei；Rui Wang
Rare earth ion ； Heteropoly compounds ； H_2S ； Desulfurization
Aerosol and Air Quality Research
|Volume or Term/Year and Month of Publication||
19卷12期（2019 / 12 / 01）
2888 - 2898
In this study, a series of rare earth monosubstituted Dawson-type polyoxometalates were synthesized for highly effective removal of hydrogen sulfide (H_2S). The unused, used and regenerated polyoxometalates were characterized by Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The results confirmed that K_(17)[Pr(P_2Mo_(17)O_(61))_2] could maintain a complete Dawson-type structure even after absorption and regeneration. H_2S absorption study showed that K_(17)[Pr(P_2Mo_(17)O_(61))_2] had the remarkable desulfurization and regeneration capabilities. Optimization experiments showed that K_(17)[Pr(P_2Mo_(17)O_(61))_2] under the condition of low H_2S concentration or high dosage of K_(17)[Pr(P_2Mo_(17)O_(61))_2] had the ideal desulfurization performance. An appropriate temperature of 25°C is necessary for high removal efficiency. The optimum pH value for desulfurization is 6.8. The desulfurization product was proved to be SO_4^(2-).