A study of Zn–Mn based sorbent for the high-temperature removal of H2S from coal-derived gas

Ko, Tzu-Hsing; Chu, Hsin; Liou, Ya Jing

doi:10.1016/j.jhazmat.2007.01.018

Cited by 58 publications

(46 citation statements)

References 23 publications

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“…It was surprising that the above observations were quite different from the previous literatures (Ko et al, 2004;Ko et al, 2007) where contrary effects of H 2 and CO on the desulfurization were found. The increasing concentration of H 2 reduced the SU of desulfurization while that of CO promoted it, and this phenomenon was related to the watergas shift reaction (Ko et al, 2004;Ko et al, 2007).…”

Section: Influence Of Co and H 2 Concentrations On The Dechlorinationcontrasting

confidence: 93%

“…The increasing concentration of H 2 reduced the SU of desulfurization while that of CO promoted it, and this phenomenon was related to the watergas shift reaction (Ko et al, 2004;Ko et al, 2007). It was concluded that in this research chance of the participation of water-gas shift reaction in the dechlorination could be low, since the concentrations of H 2 and CO showed different influence on the HCl removal.…”

Section: Influence Of Co and H 2 Concentrations On The Dechlorinationmentioning

confidence: 68%

“…Popular choices for H 2 S removal include the Ca- (Li et al, 2007), Fe- , Mn- (Bakker et al, 2003;Ko et al, 2005), Zn-based sorbent (Bu et al, 2008), and mixed metal oxide sorbent (Ko et al, 2007;Lou et al, 2009;Chang et al, 2012); those for HCl removal include the Ca- (Yan et al, 2003;Chin et al, 2005), Na-based sorbent (Nunokawa et al, 2008), and industrial catalyst mixed with multiple components (Dou et al, 2005). Due to the fact that a high percentage of the pollution emitted by coal gasification comes from sulfides, research activities focusing on desulfurization have been widely studied; while relatively little attention has been paid to dechlorination.…”

Section: Introductionmentioning

confidence: 99%

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Influence of CO and H2 Concentrations on Coal Gas Dechlorination by Supported Manganese Oxide Sorbent

Tseng

Wang

Chu

2013

Aerosol Air Qual. Res.

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The Mn 2 O 3 /SiO 2 sorbent prepared by incipient wetness impregnation was investigated for the elimination of chlorine species produced from coal gasification. The experiments were conducted in a fixed-bed reactor at 673 K with the Mn 2 O 3 /SiO 2 sorbent at various CO and H 2 concentrations to evaluate their influences on the dechlorination performance. It was observed that the absence of inlet H 2 led to a drastic decrease in the sorbent capacity; i.e., the presence of H 2 was essential for achieving dechlorination. Furthermore, the concentration of CO seemed to have no obvious effect on the HCl removal.Through the breakthrough experiments, X-ray powder diffractometer, and Fourier transform infrared spectroscopy analysis, the overall dechlorination mechanism of the Mn 2 O 3 /SiO 2 sorbent in a chlorine-containing coal gas system was successfully described in this study. The mechanism consisted of three major routes: (a) Mn 2 O 3 reacted with HCl to form MnCl 2 , (b) Mn 2 O 3 was first reduced into Mn 3 O 4 and then reacted with HCl to produce MnCl 2 , and (c) without the involvement of HCl in the dechlorination experiments, the Mn 2 O 3 contained in the fresh sorbent was first reduced to Mn 3 O 4 and then to MnO under the strong reducing atmosphere provided by CO and/or H 2 .

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Section: Influence Of Co and H 2 Concentrations On The Dechlorinationcontrasting

confidence: 93%

Section: Influence Of Co and H 2 Concentrations On The Dechlorinationmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of CO and H2 Concentrations on Coal Gas Dechlorination by Supported Manganese Oxide Sorbent

Tseng

Wang

Chu

2013

Aerosol Air Qual. Res.

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“…However, the textural properties of the fresh or regenerated sorbents are also modified because nucleation and the rate of growth of spinelstructured compounds during calcination or regeneration are highly affected (Garcıa et al, 1997). Further, though the addition of Ti prevents the vaporization of Zn, extensive spalling and cracking of the pellet remain serious problems in the development of zinc ferrite sorbents (Ko et al, 2007). Westmoreland et al (1977) showed that manganese oxide (MnO) was also suitable for high-temperature H 2 S removal.…”

Section: Introductionmentioning

confidence: 99%

“…Westmoreland et al (1977) showed that manganese oxide (MnO) was also suitable for high-temperature H 2 S removal. MnO is stable in strong reduced atmospheres, can effectually inhabit the vaporization of Zn, and can also improve the mechanical strength and sulfur capacity of the sorbent (Ko et al, 2007). Therefore, Mn-based mixed oxide sorbents attracted the attention of different research groups (Bakker et al, 2003;Yoon et al, 2003;Zhang et al, 2003;Karayilan et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Semi-Coke–Supported Mixed Metal Oxides for Hydrogen Sulfide Removal at High Temperatures

Zhang

Yongsheng

et al. 2012

Environmental Engineering Science

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To improve the desulfurization efficiency of sorbents at low cost, modified semi-coke was used as the substrate for mixed metal oxides (ZFM; oxides of zinc [Zn], iron [Fe], and manganese [Mn]) in hot gas desulfurization. Performance of the prepared ZFM/modified semi-coke (MS) sorbents were evaluated in a fixed-bed reactor in the temperature range 400-550°C. Results showed that the molar ratio of Mn to Zn, effect of the substrate, the calcination temperature, and the sulfidation temperature influenced the performance of the sorbents. Optimum conditions for the preparation of the ZFM/MS sorbents were molar ratio of Mn(NO 3 ) 2 $6H 2 O, Zn(NO 3 ) 2 , and Fe(NO 3 ) 3 , 0.6:1:2; mass ratio of ZFM0.6 to modified semi-coke support, 1:1; and calcination temperature, 600°C. The ZFM0.6/MS sorbent thus prepared exhibited the best sorption sulfur capacity of 27.46% at 450°C.

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Sulfur removal from coal‐derived syngas: thermodynamic considerations and review

Dolan

Ilyushechkin

McLennan

et al. 2010

Asia-Pacific J Chem Eng

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Current research into desulfurization sorbents for coal gasification is aimed at maximizing sorption capacity, kinetics and attrition resistance, while minimizing cost and volatility. Isolating the chemical aspects of desulfurization sorbent performance, however, is difficult because sorption performance is highly dependent on the physical form of the sorbent. To guide sorbent development, thermodynamic calculations offer a consistent basis from which to compare various aspects of sorbent performance, which includes conversion, but also speciation, volatility and regeneration. This approach has been used to compare 24 potential sorbents for the removal of sulfur from syngas, including oxides of transition metals, alkaline earths, alkalis and borates. Oxides of copper, manganese and zinc are most favourable for high-temperature sulfur sorption and these oxides are chemically regenerable. The thermodynamic calculations are confirmed by the available literature, with the ZnO, MnO and CuO receiving the most attention in recent years. Each oxide has characteristic disadvantages, such as the tendency of copper oxide to reduce, the high volatility of zinc oxide and the high regeneration temperature of manganese oxide. This is driving the development of fabrication techniques which maximize sorbent dispersion, stability and tolerance to repeated sulfidation/regeneration cycles. 

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A study of Zn–Mn based sorbent for the high-temperature removal of H2S from coal-derived gas

Cited by 58 publications

References 23 publications

Influence of CO and H2 Concentrations on Coal Gas Dechlorination by Supported Manganese Oxide Sorbent

Influence of CO and H2 Concentrations on Coal Gas Dechlorination by Supported Manganese Oxide Sorbent

Semi-Coke–Supported Mixed Metal Oxides for Hydrogen Sulfide Removal at High Temperatures

Sulfur removal from coal‐derived syngas: thermodynamic considerations and review

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