High temperature removal of hydrogen sulfide using an N-150 sorbent

Ko, Tzu-Hsing; Chu, Hsin; Chaung, Lung Kai; Tseng, Ting Ke

doi:10.1016/j.jhazmat.2004.08.023

Cited by 36 publications

(29 citation statements)

References 9 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%

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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%

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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“…On the other hand, it is also confirmed that the presence of H 2 is a negative effect on the removal reaction. The relationship among H 2 S, CO, H 2 and solid-state metal oxides can be explained via the water-shift reaction (Ko et al 2004(Ko et al , 2006. Figure 2 shows the duration time of zinc-contaminated soil as a function of different concentrations of CO and H 2 for the removal of H 2 S at 550°C.…”

Section: Resultsmentioning

confidence: 99%

“…For example, the gases containing H 2 S released from coal gasification processes accompany high temperature and relatively higher content of H 2 S as well as further decrease the overall removal efficiency when adsorption and wet absorption are used for capable of H 2 S. To overcome this disadvantage, a novel removal method has been developed based on the thermodynamic consideration. A representative scheme can be represented as follows (Ko et al 2004):…”

Section: Introductionmentioning

confidence: 99%

Application of Zn-contaminated soil: Feasibility study on the removal of H2S from hot coal-derived gas

Ko¹

2009

Environ Chem Lett

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In this study, zinc-contaminated soils were chosen as a candidate material for the removal of hydrogen sulfide (H 2 S) from hot coal-derived gas. Laboratory experiments showed that H 2 S was decreased to less than 10 ppm when the zinc-contaminated soils were reacted with H 2 S. The best removal temperature of H 2 S was found to be at 550°C in the operating conditions. In addition to zinc species, free iron oxides in contaminated soils also performed an active species to react with H 2 S and enhanced the sulfur capacity. Through the XPS analysis, iron sulfide (FeS) and zinc sulfide (ZnS) were the major products after removal experiments. Regeneration experimental results indicated that the zinc-contaminated soils can be regenerated by pass diluted air and thus be reused on the removal of H 2 S for many times.

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“…SO x is responsible for the formation of acid rain, corrosion of metal structures and is harmful to human and other living organisms (Hogan 2010;Holleman and Wiberg 2001). Removal of H 2 S from a gas stream could be accomplished by adsorption onto a solid surface (Srivastav and Srivastava 2009;Samadi-Maybodi et al 2011;Wang et al 2012;Ko et al 2004), catalytic oxidation and absorption using a liquid solution (Morais Batista et al 2010;Corma et al 1995). However, the majority of these techniques show some drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Removal of H2S from crude oil via stripping followed by adsorption using ZnO/MCM-41 and optimization of parameters

Hazrati

Abdouss

Vahid³

et al. 2014

Int. J. Environ. Sci. Technol.

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In the present work, H 2 S of crude oil was removed via a two-step method including stripping followed by adsorption. First, ZnO/MCM-41 adsorbents containing 5, 17.5 and 30 wt% of zinc were synthesized and characterized using XRD and nitrogen physisorption. Then, these materials were used as adsorbents for the removal of the H 2 S stripped from crude oil. At second step, the H 2 S of crude oil was extracted to gas phase by hot stripping. The obtained extract was collected in a storage tank for the subsequent H 2 S adsorption process. A threefactor Box-Behnken design with five center points and one response was performed for the optimization of adsorption of H 2 S. The influence of process parameters and their interactional effects on the adsorption of H 2 S were analyzed using the obtained adsorption experimental data. A model including three important factors, i.e., temperature, space velocity and amount of supported zinc and their interactions, was developed to generate the optimum condition. The point of Zn = 30 wt%, T = 300°C and space velocity = 3,000 h -1 had the optimum point with the highest break point time (t bp = 973 min).

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High temperature removal of hydrogen sulfide using an N-150 sorbent

Cited by 36 publications

References 9 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

Application of Zn-contaminated soil: Feasibility study on the removal of H2S from hot coal-derived gas

Removal of H2S from crude oil via stripping followed by adsorption using ZnO/MCM-41 and optimization of parameters

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