Bimetallic-MOF-Derived Zn_xCo_3–xO₄/Carbon Nanofiber Composited Sorbents for High-Temperature Coal Gas Desulfurization

Abstract

Desulfurization sorbent with a high active component utilization is of importance for the removal of H 2 S from coal gas at high temperatures. Thus, the hypothesis for producing Zn x Co 3−x O 4 /carbon nanofiber sorbents via the combinations of electrospinning, in situ hydrothermal growth, and carbonization technique has been rationally constructed in this study. Zn x Co 3−x O 4 nanoparticles derived from metal−organic frameworks are uniformly loaded on the electrospun carbon nanofibers (CNFs) with high dispersion. Zn x Co 3−x O 4 /CNFs sorbents possess the highest breakthrough sulfur adsorption capacity (12.4 g S/100 g sorbent) and an excellent utilization rate of the active component (83.2%). The excellent performance of Zn x Co 3−x O 4 /CNFs can be attributed to the synergetic effect of the hierarchical structure and widely distributed Zn x Co 3−x O 4 on the CNFs supporter. The decomposition of Zn/Co−ZIFs not only generates the nucleus of oxides but also realizes their physical isolation through the formation of carbon grids on the surface of CNFs, avoiding the aggregation of oxides. Furthermore, Zn x Co 3−x O 4 /CNFs sorbents show an overwhelming superiority over the ZnO/CNFs sorbent, which is attributed to the introduction of Co and then the promotion of the stability of Zn at high temperatures. The presence of Co also accelerates the adsorption of H 2 S on the active site of the oxide surface. The presented method is beneficial for promoting desulfurization performances and producing sorbents with high utilization of active components.

Rational construction of ZnO/CuS heterostructures-modified PVDF nanofiber photocatalysts with enhanced photocatalytic activity

“…Consequently, the p-n heterojunction signicantly limits charge recombination and enhances the composites photocatalytic activity. 41,46,58,65,66 Meanwhile, the visible light-induced photodegradation of MB is also investigated. According to Fig.…”

Rational Construction of MOF-Derived Porous ZnTiO3/TiO2 Heterostructured Photocatalysts with Remarkable Photocatalytic Performance

“…The specific surface area of ZIF-8 was 1139.5 m 2 g –1 , and the pore diameter was ∼2 nm with a large number of micropores (Figure S4), which was beneficial for adsorption. Besides, the N 2 adsorption desorption isotherm of ZIF-8@TiO 2 belonged to type IV and exhibited H 2 hysteresis in the range of 0.5–0.9 for P / P 0 , indicating that ZIF-8@TiO 2 has mesoporous structure (Figure a) . ZIF-8@TiO 2 exhibited a much smaller specific surface area of 75.2 m 2 g –1 than ZIF-8, and the pore size distribution of is mainly at 10 nm, indicating that ZIF-8 were successfully wrapped by TiO 2 shell and exhibited the similar porous properties to ZIF-8.…”

Highly Dispersed FeAg-MCM41 Catalyst for Medium-Temperature Hydrogen Sulfide Oxidation in Coke Oven Gas

“…Concerning Ag 3d XPS spectra (Figure S20), the peaks observed at 368.4 and 374.5 eV can be attributed to the Ag 0 electronic state. , This indicates that Ag 0 is the main form of Ag on the catalyst surface, which might be responsible for the formation of Fe­(II) (Fe 3+ + Ag 0 → Fe 2+ + Ag + ). Moreover, the XPS spectra of S 2p for 30Fe5Ag-MCM41 (Figure S21) exhibit four peaks centered at 161.6, 162.9, 164.2, and 169.6 eV, corresponding to sulfur species, including sulfide (S 2– ), polysulfide polymer (S n 2– ), elemental sulfur (S 8 ), and SO 4 2– , respectively. ,, Sulfur in a low-valence state as the main form of byproduct after desulfurization indicates that the addition of Ag effectively avoids excessive sulfur oxidation. In addition, the XPS spectra of Si 2p, Al 2p, and O 1s remained unchanged before and after metal loading (Figure S22).…”