Desulfurization Capacity of Iron Oxide Minerals for High Temperature Removal of H2S and its Relation to Their Physical Properties. Desulfurization of a gas mixture without steam.

Kushiyama, Satoshi; Koinuma, Yutaka; Kobayashi, Satoru; Aizawa, Reiji; Mizuno, Koichi

doi:10.3775/jie.73.737

Cited by 2 publications

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“…This is the reason why the surface was sulfurized, and thus Fe was not detected because the penetration depth of X-rays in XRD measurements is always 0.01–20 μm. This result shows that desulfurization by reduced limonite proceeds according to the unreacted-core model. , As shown in Figure , the H 2 S adsorption form changes with temperature in reduction atmosphere (in 50%H 2 , 30%CH 4 , 5%CO, 5%CO 2 , 5%H 2 O coexisting). In addition, the adsorption form of Fe 1– x S was determined at low temperature (300–400 °C), whereas FeS was mainly observed at high temperature (≥500 °C) in all atmosphere, except in He, as seen in Figures , S2, S3 and Table .…”

Section: Results and Discussionmentioning

confidence: 99%

“…Our research group has been investigating the catalytic decomposition of NH 3 or model tar-N compounds (pyridine or pyrrole) using inexpensive iron catalysts, − and it has been found that fine particles of metallic iron (α-Fe) formed from low-grade iron ore (limonite) provide high activity in the decomposition of NH 3 , pyridine, or pyrrole in an inert or simulated gasification fuel gas. − In addition, we recently showed that limonite-derived α-Fe can provide stable activity for the decomposition of 100 ppmv C 5 H 5 N to N 2 in COG components. , On the other hand, it is well-known that iron oxide is effective for the H 2 S removal in fuel gas at 300–700 °C. − Thus, it is possible that limonite-derived α-Fe will be a good adsorbent for H 2 S in COG. However, only a few studies have reported H 2 S removal in COG using iron-based adsorbents. − It is well-known that a typical COG is composed of 54–59%H 2 , 24–28%CH 4 , 4–7%CO, 1–3%CO 2 , and 1–3%H 2 O with impurities, but the influence of the individual COG components on H 2 S removal has not been investigated in previous studies. − …”

Section: Introductionmentioning

confidence: 99%

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Removal of Hydrogen Sulfide in Simulated Coke Oven Gas with Low-Grade Iron Ore

Mochizuki

Tsubouchi

2017

Energy Fuels

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The hydrogen sulfide (H2S) removal performance of limonite in the presence of coke oven gas (COG) components (H2, CH4, CO, CO2, and H2O) has been studied in a cylindrical flow-type quartz-made fixed-bed reactor at 300–800 °C under a high space velocity of 51,000 h–1 to develop a novel hot gas cleanup method. The H2S removal behavior by reduced limonite in He does not change at the temperatures examined. On the other hand, the breakthrough curves in 50%H2/He depend on the temperature, and high performance is found at lower temperatures. An investigation of the breakthrough curves of H2S in the presence of COG components at 300–600 °C reveals that the addition of 30%CH4 to 50%H2/He does not influence the performance below 500 °C, whereas the coexistence of 5%CO with 50%H2/30%CH4/He drastically decreases the H2S removal ability of reduced limonite. In addition, the breakthrough curves in 5%CO2 coexisting with 50%H2/30%CH4/5%CO/He are similar to those of 50%H2/30%CH4/5%CO/He. However, the addition of 5%H2O to 50%H2/30%CH4/5%CO/He dramatically improves the H2S removal performance of reduced limonite. Similar tendencies are observed in simulated COG (50%H2/30%CH4/5%CO2/5%H2O/He). Furthermore, the H2S breakthrough curve strongly depends on the space velocity.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Removal of Hydrogen Sulfide in Simulated Coke Oven Gas with Low-Grade Iron Ore

Mochizuki

Tsubouchi

2017

Energy Fuels

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“…In order to depress the corrosion of metal alloys and electrode materials, desulfurization of the coal gas at the high temperature is one of key technologies to attain the high efficiency. So far, reduced iron, 2) zinc ferrite and the other ferrites 3) have been developed and tested as reagent for the desulfurization.…”

Section: Introductionmentioning

confidence: 99%

Sulfur Sorption Rate and Equilibrium Content of Reduced Iron in H2-H2S Mixtures

Iguchi

Itoh²

2004

ISIJ International

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Contents and rates of the sulfur sorption on the reduced iron from hematite and limonite were measured in the atmosphere of H 2 -H 2 S mixture of sulfur activity less than unity by combining the thermogravimetric method with the reaction interruption method. The sulfur content by the former was a half the content by the latter presumably owing to the sorbed sulfur exchanged with sorbed oxygen. In this study, the saturated content of sulfur, which is attained after enough long time, was estimated by the latter and the sorption rate was measured by the former. The equilibrium content was properly expressed by the Langmuir's isotherm. The simulation of the sorption rate by the parallel model, in which the diffusion of gas molecules in the pore and the diffusion of adsorbed species on the wall of the pore were taken into account, was tried. It was successful with the sulfur sorption of the reduced iron from limonite and the diffusion was mainly surface diffusion at 873 K, but it gradually shifted to the diffusion in pore with increasing temperature. But any trial was unsuccessful with that from the hematite. The reason may be attributed to, in the reduced iron from the hematite, the contribution of sulfur segregated on the grain boundary of reduced iron is significant relative to the total sorption content to the content of sulfur adsorbed on the surface pore.

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Desulfurization Capacity of Iron Oxide Minerals for High Temperature Removal of H2S and its Relation to Their Physical Properties. Desulfurization of a gas mixture without steam.

Cited by 2 publications

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Removal of Hydrogen Sulfide in Simulated Coke Oven Gas with Low-Grade Iron Ore

Removal of Hydrogen Sulfide in Simulated Coke Oven Gas with Low-Grade Iron Ore

Sulfur Sorption Rate and Equilibrium Content of Reduced Iron in H2-H2S Mixtures

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