Temperature programmed decomposition desorption of the mercury species over spent iron-based sorbents for mercury removal from coal derived fuel gas

Ozaki, Masaki; Uddin, Md. Azhar; Sasaoka, Eiji; Wu, Shengji

doi:10.1016/j.fuel.2008.06.011

Cited by 85 publications

(59 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…HgCl 2 <HgS<HgO<HgSO 4 ) according to the temperature of desorption [22]. Thermal decomposition has been used to identify Hg compounds in soil contaminates, sediment samples, iron-based sorbents [23][24][25], and even in mercury lamp wastes [26]. However, there is a lack of a similar knowledge concerning the speciation of Hg in coal combustion products [27].…”

Section: Introductionmentioning

confidence: 99%

Speciation of mercury in fly ashes by temperature programmed decomposition

López-Antón

Perry

Abad-Valle

et al. 2011

Fuel Processing Technology

View full text Add to dashboard Cite

Mercury (Hg) is a toxic trace element which is emitted mostly in gas phase during coal combustion, although some Hg compounds may be retained in the fly ashes depending on the characteristics of the ashes and process conditions. To improve the retention of Hg in the fly ashes a good knowledge of the capture mechanism and Hg species present in the fly ashes is essential. The temperature programmed decomposition technique was chosen

show abstract

Section: Introductionmentioning

confidence: 99%

Speciation of mercury in fly ashes by temperature programmed decomposition

López-Antón

Perry

Abad-Valle

et al. 2011

Fuel Processing Technology

View full text Add to dashboard Cite

show abstract

“…There are three dominate forms of mercury in the combustion flue gas, elemental (Hg 0 ), oxidized (Hg 2? ), and particle bound (Hg p ) [2]. Of these three, elemental is the most difficult to remove, based on its reactivity and low solubility in water [3].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of elemental mercury adsorption by fly ash modified with ammonium bromide

Zhang

Lin

et al. 2015

J Therm Anal Calorim

View full text Add to dashboard Cite

Coal-fired power plants are significant contributors to the anthropogenic emission of mercury. This study focus on evaluated the methods for modification and preparation of fly ash adsorbent which can be applied to adsorb mercury from power plants. Comparing with isometric impregnation and ion exchange method, it was found that the cost and preparation time of the mechanochemical method significantly reduced. Hg 0 adsorption performances of NH 4 Br-modified fly ashes and subsequent effects of mechanical energy on modifying fly ash were investigated, and the results indicated that increasing mechanical force can make the distribution of bromides to be more uniform and increase the number of surface active sites and groups. Furthermore, Hg 0 removal efficiency improved significantly with the increasing bromine loading at 150°C. There is a positive correlation between mechanical energy on modifying fly ash and subsequently Hg 0 adsorption performance. TG/MS analysis was utilized to determine the thermal stability and released material of different samples. Results demonstrated the release of ammonia, which from the modified fly ashes with mechanochemical method, most likely enhances the oxidation and subsequent adsorption of mercury in the 150-200°C temperature range. All results revealed that the mechanochemical application method for adsorbent preparation on site is competitive on economy, practicability, and mercury removal efficiency.

show abstract

“…Thermal decomposition techniques have been used to identify Hg compounds in soil, sediment samples, iron-based sorbents, and even in Hg lamp waste. The Hg species thermally released from contaminated soils can be analysed in several ways, including temperature-controlled continuous heating of samples in a furnace coupled to an atomic absorption spectrophotometer (AAS) (Windmoller et al, 1996) the use of solid-phase Hg-thermodesorption techniques complemented by selective extraction of organically bound Hg (Biester et al, 2000) by temperature programmed decomposition desorption (TPDD) (Ozaki et al, 2008), or by pyrolysis and X-ray absorption fine spectroscopy (XAFS) (Liu et al, 2006). Table 1 shows the mercury speciation derivatives recorded by different researchers.…”

Section: Introductionmentioning

confidence: 99%

Non-isothermal kinetics of the thermal desorption of mercury from a contaminated soil

López¹,

Sierra²,

Rodríguez³

et al. 2014

REVMETAL

View full text Add to dashboard Cite

SUMMARY:The Almadén mining district (Ciudad Real, Spain) was the largest cinnabar (mercury sulphide) mine in the world. Its soils have high levels of mercury a consequence of its natural lithology, but often made much worse by its mining history. The present work examines the thermal desorption of two contaminated soils from the Almadén area under non-isothermal conditions in a N 2 atmosphere, using differential scanning calorimetry (DSC). DSC was performed at different heating rates between room temperature and 600 °C. Desorption temperatures for different mercury species were determined. The Friedman, Flynn-Wall-Ozawa and Coasts-Redfern methods were employed to determine the reaction kinetics from the DSC data. The activation energy and pre-exponential factor for mercury desorption were calculated. KEYWORDS: RESUMEN: Estudio cinético, en condiciones no-isotérmicas, de la desorción térmica del mercurio en suelos contaminados.El distrito minero de Almadén (Ciudad Real, España) tiene la mayor mina de cinabrio (sulfuro de mercurio) del mundo. Sus suelos tienen altos niveles de mercurio como consecuencia de su litología natural, pero a menudo su contenido en mercurio es mucho más alto debido a la historia minera de la zona. Este trabajo examina la desorción térmica de dos suelos contaminados procedentes de Almadén bajo condiciones isotérmicas en atmósfera de N 2 , empleando calorimetría diferencial de barrido (DSC). La calorimetría se llevó a cabo a diferentes velocidades de calentamiento desde temperatura ambiente hasta 600 °C. Se determinaron las diferentes temperaturas de desorción de las especies de mercurio presentes en los suelos. Para determinar la cinética de reacción a partir de los datos de DSC se utilizaron los métodos de Friedman, Flynn-Wall-Ozawa y Coasts-Redfern. Además se calcularon las energías de activación y los factores pre-exponenciales para la desorción del mercurio.

show abstract

Temperature programmed decomposition desorption of the mercury species over spent iron-based sorbents for mercury removal from coal derived fuel gas

Cited by 85 publications

References 18 publications

Speciation of mercury in fly ashes by temperature programmed decomposition

Speciation of mercury in fly ashes by temperature programmed decomposition

Evaluation of elemental mercury adsorption by fly ash modified with ammonium bromide

Non-isothermal kinetics of the thermal desorption of mercury from a contaminated soil

Contact Info

Product

Resources

About