Preparation of Fly Ash-Ca(OH)<sub>2</sub>Sorbents by Pressure Hydration for SO<sub>2</sub>Removal

Karatepe, Nilgün; Meriçboyu, Ayşegül Ersoy; Küçükbayrak, Sadriye

doi:10.1080/00908319808970109

Cited by 16 publications

(12 citation statements)

References 9 publications

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“…The adsorption behavior of CaO, MgO and RbO is closely related to the nature of the product formed during the adsorption and to the surface area. The surface area of a solid sorbent is a very important parameter in the solid gas adsorption process and may be on the principal factors determining overall reacitivity (Karatepe et al, 1998). Therefore, selection of CaO as the sorbent support is good idea for further study.…”

Section: Resultsmentioning

confidence: 99%

Development of Superior Sorbents for Separation of CO2 from Flue Gas at a Wide Temperature range during Coal Combustion

Smirniotis¹

2002

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A number basic sorbents based on CaO were synthesized, characterized with novel techniques and tested for sorption of CO 2 and selected gas mixtures simulating flue gas from coal fired boilers. Our studies resulted in highly promising sorbents which demonstrated zero affinity for N 2 , O 2 , SO 2 , and NO very low affinity for water, ultrahigh CO 2 sorption capacities, and rapid sorption characteristics, CO 2 sorption at a very wide temperature range, durability, and low synthesis cost. One of the "key" characteristics of the proposed materials is the fact that we can control very accurately their basicity (optimum number of basic sites of the appropriate strength) which allows for the selective chemisorption of CO 2 at a wide range of temperatures. These unique characteristics of this family of sorbents offer high promise for development of advanced industrial sorbents for the effective CO 2 removal.4

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Section: Resultsmentioning

confidence: 99%

Development of Superior Sorbents for Separation of CO2 from Flue Gas at a Wide Temperature range during Coal Combustion

Smirniotis¹

2002

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“…Thus, the preparation of sorbents for flue gas desulfurization using coal fly ash has recently been studied extensively. [5][6][7][8][9][10][11][12] It is well known that the reactivity of the hydrated sorbents depends strongly on their surface area. Fernandez et al 4 reported that the SO 2 capture activity of these sorbents generally increases with the higher specific surface area of the sorbent.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of sorbents prepared from ash (waste material) for sulfur dioxide (SO2) removal

Lee

Bhatia

Mohamed

2005

J Mater Cycles Waste Manag

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Sorbents synthesized from various types of ash (coal fly ash, coal bottom ash, oil palm ash, and incinerator ash) for flue gas desulfurization were investigated. The sorbents were prepared by mixing the ashes with calcium oxide and calcium sulfate using the water hydration method. The effects of various sorbent preparation variables, such as the hydration period, the ratio of calcium oxide to ash, and the amount of calcium sulfate, on the Brunauer-EmmettTeller (BET)-specific surface area of the resulting sorbent were studied using a two-level full factorial design. The surface area of the sorbents obtained range from 15.4 to 122.1 m 2 /g. Regression models were developed to correlate the significant variables to the surface area of the sorbents. An analysis of variance (ANOVA) showed that the model was significant at a confidence level of 95%. It was found that apart from all the individual variables studied, interactions between variables also exerted a significant influence on the surface area of the sorbent. From the activity test results, it was found that sorbents prepared from coal fly ash and oil palm ash have the highest SO 2 absorption capacity. Scanning electron microscope (SEM) analysis showed that the sorbent was composed of a compound with a high structural porosity, while an X-ray diffraction spectrum showed that calcium aluminum silicate hydrate compounds are the main products of the hydration reaction.

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“…The structural properties of these sorbents, particularly the specific surface area, are believed to play an important role in SO 2 capture. Some studies have shown that higher desulfurization activity correlates with higher specific surface areas (Karatepe et al, 1998;Lin et al, 2003). Jozewicz and Chang (1989) reported that high sorbent surface area is one of the necessary factors that must be found in a sorbent for it to be able to react with SO 2 under the conditions encountered in dry-type flue gas desulfurization (FDG) process.…”

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confidence: 98%

“…In the control of sulfur dioxide (SO 2 ) emission from coal-fired power plants, many studies have shown that when coal fly ash is mixed with Ca(OH) 2 or CaO in a hydration process, sorbents with high SO 2 capture capacity could be attained (Karatepe et al 1997(Karatepe et al , 1998Ishizuka et al 2000;Renedo and Fernandez 2002;Lin et al 2003). These sorbents with high surface area are a product of the pozzolanic reaction between silica eluted from the fly ash and Ca(OH) 2 or CaO.…”

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confidence: 99%

Optimization of Process Parameters for the Preparation of CaO/CaSO₄/Coal Fly Ash Sorbent for Sulfur Dioxide (SO₂) Removal: Part II

Lee

Bhatia

Mohamed

2006

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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Preparation of Fly Ash-Ca(OH)₂Sorbents by Pressure Hydration for SO₂Removal

Cited by 16 publications

References 9 publications

Development of Superior Sorbents for Separation of CO2 from Flue Gas at a Wide Temperature range during Coal Combustion

Development of Superior Sorbents for Separation of CO2 from Flue Gas at a Wide Temperature range during Coal Combustion

Preparation and characterization of sorbents prepared from ash (waste material) for sulfur dioxide (SO2) removal

Optimization of Process Parameters for the Preparation of CaO/CaSO₄/Coal Fly Ash Sorbent for Sulfur Dioxide (SO₂) Removal: Part II

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Preparation of Fly Ash-Ca(OH)2Sorbents by Pressure Hydration for SO2Removal

Cited by 16 publications

References 9 publications

Development of Superior Sorbents for Separation of CO2 from Flue Gas at a Wide Temperature range during Coal Combustion

Development of Superior Sorbents for Separation of CO2 from Flue Gas at a Wide Temperature range during Coal Combustion

Preparation and characterization of sorbents prepared from ash (waste material) for sulfur dioxide (SO2) removal

Optimization of Process Parameters for the Preparation of CaO/CaSO4/Coal Fly Ash Sorbent for Sulfur Dioxide (SO2) Removal: Part II

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Preparation of Fly Ash-Ca(OH)₂Sorbents by Pressure Hydration for SO₂Removal

Optimization of Process Parameters for the Preparation of CaO/CaSO₄/Coal Fly Ash Sorbent for Sulfur Dioxide (SO₂) Removal: Part II