Desulfurization Process and Kinetics of Fe/Activated Carbon Removal of H₂S at Low Temperature

Abstract

Fe/activated carbon desulfurizer is prepared by precipitation method using activated carbon as carrier to remove H2S. The desulfurizer before and after desulfurization was characterized by XRD, XPS, SEM and N2 adsorption–desorption. The results show that the active component of desulfurizer is Fe2O3, which reacts with H2S to form FeS, elemental sulfur and Fe2(SO4)3. The sulfide block the pores, causing the specific surface area, pore volume and fractal dimension to decrease after desulfurization. The effects of gas flow rate, particle size and temperature on the removal of H2S were investigated by solid‐bed reactor. Based on the above experimental data, an improved unreacted shrinking core model is used to study the kinetics of Fe/activated carbon desulfurization at low temperature. The improved unreacted shrinking core model is used to analyzing experimental data, in which the activation energies of surface reaction and internal diffusion were determined to be 0.8801 and 3.301 kJ/mol, respectively.

Enhanced activity and sulfur resistance of Cu- and Fe-modified activated carbon for the reduction of NO by CO from regeneration gas

“…It is inferred that the carbonyl oxygen in -COOH acts as an anchoring site, which decreases the ratio of -COOH and increases the ratio of -OH. 47 The decreases in -COOH after reaction on all samples indicate that -COOH groups are consumed as active sites for 48,49 The Cu 2p peak consists of Cu + 2p 3/2 (932.5-932.8 eV), Cu 2+ 2p 3/2 (932.9-933.2 eV), Cu 2+ -containing salts 2p 3/2 (934.6-934.9 eV), Cu + 2p 1/2 (952.25-952.55 eV), Cu 2+ 2p 1/2 (952.65-952.95 eV), and Cu 2+ -containing salts 2p 1/2 (954.35-954.65 eV). 50,51 The proportions of various Fe and Cu species in the different samples are shown in Fig.…”

Ultra‐Fast Recyclable and Value‐Added Desulfation Method for Spent Lead Paste via Dual Intensification Processes

“…This reaction can be characterized by the shrinking core model of the PbSO 4 desulfation (Figure 3a). [33][34][35] If the reaction process is controlled by a chemical reaction, the reaction kinetic equation can be written as [36] [1…”

Significance of micropores for removal of hydrogen sulfide from oxygen-free gas streams by activated carbon

“…Activated carbon is the most widely used adsorbent for H 2 S in the puri cation of gas streams (Li et al, 2022;Li et al, 2020;Yang et al, 2020;Choudhury et al, 2020). Generally, removal of H 2 S requires that the activated carbon is loaded with catalyst, which is commonly an alkaline substance or metal oxide, because the pristine activated carbon has poor adsorption capacity for H 2 S (Habeeb et Therefore, the adsorption capacity of activated carbon for H 2 S depends not only on its physicochemical properties but also the adsorption parameters (Choi et al, 2008;Zeng et al, 2020;Zhang et al, 2020). In particular, in the presence of oxygen, H 2 S can be oxidized to S, SO…”