Regeneration performance and characteristic of iron oxide/arenaceous sorbents in the atmosphere of O 2 /N 2

Feng, Yu; Mi, Jie; Chang, Bingwei; Wu, Mengmeng; Ju, Sheng; Fan, Hua

doi:10.1016/j.fuel.2016.09.025

Cited by 11 publications

(9 citation statements)

References 20 publications

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“…Increasing the space velocity from 2000 to 3000 h –1 results in a greater regeneration rate (95.6%), which is due to lower mass transfer resistance at higher space velocity . It is notable that the intensity of XRD peaks assigned to Zn 2 SiO 4 appears much weaker at the space velocity of 3000 h –1 , while further increase of the space velocity leads to a lower regeneration rate (91.9%), longer regeneration time, and stronger intensity of XRD peaks of Zn 2 SiO 4 .…”

Section: Resultsmentioning

confidence: 94%

“…It is notable that the intensity of XRD peaks assigned to Zn 2 SiO 4 appears much weaker at the space velocity of 3000 h –1 , while further increase of the space velocity leads to a lower regeneration rate (91.9%), longer regeneration time, and stronger intensity of XRD peaks of Zn 2 SiO 4 . The regeneration reaction is a typical gas–solid reaction, , and the first step is the adsorption of O 2 and subsequent reaction of adsorbed O 2 with ZnS . Consequently, a shorter retention time of O 2 on the surface of used sorbents when regenerated at the space velocity of 4000 h –1 is unfavorable for the oxidization regeneration.…”

Section: Resultsmentioning

confidence: 99%

“…The regeneration space velocity varied over the range of 2000–4000 h –1 . The iodometry was used to analyze the concentrations of outlet SO 2 . The regeneration rate ( R r , %) is caculated by the following equation: where S a and S b represent the mass of sulfur containing in the sorbent after and before regeneration, respectively.…”

Section: Experimental Sectionmentioning

confidence: 99%

“…The regeneration rate ( R r , %) is caculated by the following equation: where S a and S b represent the mass of sulfur containing in the sorbent after and before regeneration, respectively. The measurement for sulfur content and mechanical strength of sorbents was described in the previous study …”

Section: Experimental Sectionmentioning

confidence: 99%

“…The regeneration space velocity varied over the range of 2000−4000 h −1 . The iodometry 17 was used to analyze the concentrations of outlet SO 2 . The regeneration rate (R r , %) is caculated by the following equation:…”

Section: Desulfurization Evaluationmentioning

confidence: 99%

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Hot Coal Gas Desulfurization Using Regenerable ZnO/MCM41 Prepared via One-Step Hydrothermal Synthesis

Jia

Fan

et al. 2017

Energy Fuels

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ZnO/MCM41 sorbents with bimodal pore structure were prepared via one-step hydrothermal synthesis. The structure of fresh, sulfided, and regenerated sorbents was characterized using XRD, TEM, SEM, nitrogen adsorption isotherms, and XPS techniques. The results indicate that the desulfurizer with 35% ZnO shows the highest sulfur capacity (11.0 g of S/100 g of sorbents). The optimum regeneration conditions were 650 °C, 3000 h −1 , and 6% O 2 concentration. Both ZnO and ZnSiO 4 were observed in the regenerated sorbents. The increase of regeneration cycles leads to higher content of the Zn 2 SiO 4 . However, it results in no significant effect on the performance of sorbents during five sulfidation/regeneration cycles. It may be due to the transformation of Zn 2 SiO 4 into ZnO under conditions of desulfurization. After five successive sulfidation/regeneration cycles, the sorbents still maintain high sulfur capacity (9.8 g of S/100 g of sorbents) and mechanical strength (80 N/cm).

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Section: Resultsmentioning

confidence: 94%