Composition modulation of composited metal oxides sorbents based on modified nanofibers for H2S removal towards high temperature coal gas

Constructing desulfurization sorbents with optimal composition and high loading of active components that are uniformly dispersed is critical for enhancing performance. Here, composite sorbents with bi- and tri-metals were prepared through electrospinning, amidoxime modification, metal ion impregnation and thermal treatment. The effects of metal loading levels, types, and combinations on the pore structure and desulfurization performance of the sorbents were investigated. According to the results, FZ/MC sorbent with higher active component loading and improved pore structure exhibited the best desulfurization performance, achieving sulfur capacity of 9.94 g S/100 g sorbent among the bi-metallic sorbents. Furthermore, the tri-metallic sorbent FZM/MC achieved a sulfur capacity of 13.31 g S/100 g sorbent, representing a 33.90 % increase compared to that of FZ/MC. Adsorption kinetics of metal ions on amidoxime modified nanofibers indicated that the adsorption process followed the pseudo-second-order model, suggesting that the adsorption rate of metal ions was controlled by chemical adsorption. Adsorption kinetics further revealed that the modified amidoxime nanofibers involved the potential for adsorbing more metal ions and thereby enhancing the loading capacity and desulfurization performance.