Catalysts and Processes for H2S Conversion to Sulfur

Barba, Daniela

doi:10.3390/catal11080903

Cited by 2 publications

(1 citation statement)

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“…On the other hand, hot gas desulfurization (HGD) is regarded as a clean technology that scrubs the concentration of sulfur compounds to one-tenth of the original levels and improves the power generation efficiency at the same time, due to the sulfur compound removal. Various dry desulfurization sorbents (including Zn, Ca, Mn, Fe, Cu, and Ni-based sorbents) have been studied for high removal efficiency over HGD [9][10][11][12][13][14][15][16][17]. In recent years, most studies have mainly focused on the regenerability and durability of desulfurization sorbents.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Cause of the SO2 Generation during Hot Gas Desulfurization (HGD) Process

et al. 2021

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In the integrated gasification combined cycle (IGCC) process, the sulfur compounds present in coal are converted to hydrogen sulfide (H2S) when the coal is gasified. Due to its harmful effects on sorbent/solvent and environmental regulations, H2S needs to be removed from the product gas stream. To simulate the H2S removal process, desulfurization was carried out using a dry sorbent as a fluidizing material within a bubbling, high-temperature fluidized bed reactor. The ZnO-based sorbent showed not only an excellent capacity of H2S removal but also long-term stability. However, unexpected SO2 gas at a concentration of several hundred ppm was detected during the desulfurization reaction. Thus, we determined that there is an unknown source that supplies oxygen to ZnS, and identified the oxygen supplier through three possibilities: oxygen by reactant (fresh sorbent, ZnO), byproduct (ZnSO4), and product (H2O). From the experiment results, we found that the H2O produced from the reaction reacts with ZnS, resulting in SO2 gas being generated during desulfurization. The unknown oxygen source during desulfurization was deduced to be oxygen from H2O produced during desulfurization. That is, the oxygen from produced H2O reacts with ZnS, leading to SO2 generation at high temperature.

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