Comparing regenerative SO2 sorbents using tg: The SRO test

Duisterwinkel, A.E.; Doesburg, E.B.M.; Hakvoort, G.

doi:10.1016/0040-6031(89)87040-6

Cited by 18 publications

(4 citation statements)

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“…Among these favorable metal oxides for flue gas desulfurization, sodium and copper oxides have been the most extensively studied. Since the introduction of the Shell flue gas desulfurization process (copper oxide process) in the late 1960s, a significant amount of work has been carried out to develop improved regenerative sorbents for flue gas desulfurization processes. − Different porous materials including γ-alumina, α-alumina, silica, and titania were used as the sorbent supports. However, one of the persisting problems associated with the dry regenerable sorbent processes developed for FGD applications has been the high sorbent attrition rates .…”

Section: Introductionmentioning

confidence: 99%

Dry Regenerable Metal Oxide Sorbents for SO₂ Removal from Flue Gases. 1. Development and Evaluation of Copper Oxide Sorbents

Gavaskar

Abbasian

2006

Ind. Eng. Chem. Res.

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The reactivities of a number of copper-based sorbent prepared by the sol−gel method toward SO2 were determined in a thermogravimetric analyzer as well as a fluid-bed reactor. The copper content of these sorbents ranged from 11.2 to 26.5%. The highest sorbent capacity was achieved with sorbent with copper content of 14.1%. All these sorbents have significantly higher mechanical strength than commercially available copper-based sorbents and commercial fluid catalytic cracking catalysts (i.e., 5−8 times higher), making them suitable for fluidized-bed applications. The reactivity of the sorbent increases with increasing temperature up to 450 °C, and starts to decrease significantly beyond 500 °C, possibly due to sintering of the sorbent. Although these sorbents can be readily and completely regenerated with natural gas, the overall sulfur capacity of the sorbents gradually decreases in the cyclic operation and appears to stabilize after about 20 cycles, making them suitable for regenerative flue gas desulfurization applications.

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Section: Introductionmentioning

confidence: 99%

Dry Regenerable Metal Oxide Sorbents for SO₂ Removal from Flue Gases. 1. Development and Evaluation of Copper Oxide Sorbents

Gavaskar

Abbasian

2006

Ind. Eng. Chem. Res.

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“…Since strong SO 2 adsorption on alumina occurs at basic sites, alkalized alumina is an obvious choice for an alumina-based sorbent for SO 2 . Methods for the preparation of alkali-doped aluminas include the following: (a) melting and sintering of alumina with the hydroxides or carbonates , of alkali metals at 650−1100 °C; (b) mixing dried sodium acetate with alumina and calcining the mixture at 450 °C; , (c) incipient wetness using aqueous sodium sulfate or acetate followed by calcining at 700−800 °C; , (d) soaking alumina in aqueous solutions of sodium-containing salts, followed by filtration of the solid, drying, and calcining. ,, Other methods of impregnating alumina with alkali and alkaline-earth metals are described elsewhere. − …”

Section: Introductionmentioning

confidence: 99%

Adsorption and Reaction of Sulfur Dioxide on Alumina and Sodium-Impregnated Alumina

1996

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The adsorption and oxidation of SO2 on alumina and sodium-impregnated alumina has been examined using thermogravimetric analysis and diffuse reflectance infrared Fourier transform spectroscopy. Sulfur dioxide chemisorbs initially at basic sites to form an adsorbed sulfite, which is quantitatively converted to sulfate on oxidation. It has been observed that at low coverages, ∼2.6 μmol/m2, sodium acts as a promoter for the formation of an adsorbed sulfite and sulfate which have structures similar to those of aluminum sulfite and sulfate, respectively. At higher sodium loadings, a second type of adsorbed SO2 is formed, similar to sodium sulfite and sulfate. The species with the aluminum sulfate structure appears to be more easily decomposed than does the sodium sulfate species and accounts for the regenerable adsorption capacity. Formation of the sodium sulfate species appears to account for the loss of adsorption capacity as the number of adsorption/regeneration cycles increases. Oxidation of the sulfite form to the sulfate form can occur in the absence of added oxygen, but it is an activated process and begins to occur in measurable amounts at temperatures between 150 and 300 °C. Partitioning of adsorbed SO2 between aluminum and sodium forms is not a function of temperature and depends on only sodium loading.

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“…Since the introduction of the Shell flue gas desulfurization process (copper oxide process) in the late 1960s (Dautzenberg et al, 1971), a significant amount of work has been done to improve the existing regenerative sorbents or to develop new types of regenerative sorbents for flue gas desulfurization processes (Centi et al, 1990;Cull, 1978;Duisterwinkel et al, 1989;Hakvoort et al, 1987;Hedges and Yeh, 1992;Kiel et al, 1992;Wolff et al, 1993;Yang and Shen, 1979). Different porous materials including γ-alumina, R-alumina, silica, and titania have been applied as the sorbent supports.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Stability, and Sulfation Properties of Sol−Gel-Derived Regenerative Sorbents for Flue Gas Desulfurization

Deng

1996

Ind. Eng. Chem. Res.

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The sol-gel method is applied to prepare γ-alumina-supported copper oxide and calcium oxide sorbents containing 10-50 wt % active species. The prepared sorbents are characterized for their pore texture, dispersion of active species on the surface of support, and desulfurization properties. The sol-gel-derived alumina-supported sorbents have a relatively large surface area (>200 m 2 /g) and pore volume (>0.3 cm 3 /g) and uniform pore size distribution (20-60 Å). Thermal and chemical stability of the sol-gel-derived sorbents is studied by comparing the pore texture data of the sorbents before and after several different heat treatments. The stability results show that the pore structure of the sol-gel-derived sorbents is stable in the normal conditions of the flue gas desulfurization process. It is found that CuO/γ-Al 2 O 3 sorbent containing 20 wt % of CuO coated as a monolayer or submonolayer on the surface of support has the highest SO 2 sorption capacity (22.5 wt % at 500°C). The sol-gel-derived CuO/γ-Al 2 O 3 sorbent exhibits desired sulfation and regeneration properties.

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Comparing regenerative SO2 sorbents using tg: The SRO test

Cited by 18 publications

References 2 publications

Dry Regenerable Metal Oxide Sorbents for SO₂ Removal from Flue Gases. 1. Development and Evaluation of Copper Oxide Sorbents

Dry Regenerable Metal Oxide Sorbents for SO₂ Removal from Flue Gases. 1. Development and Evaluation of Copper Oxide Sorbents

Adsorption and Reaction of Sulfur Dioxide on Alumina and Sodium-Impregnated Alumina

Synthesis, Stability, and Sulfation Properties of Sol−Gel-Derived Regenerative Sorbents for Flue Gas Desulfurization

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Comparing regenerative SO2 sorbents using tg: The SRO test

Cited by 18 publications

References 2 publications

Dry Regenerable Metal Oxide Sorbents for SO2 Removal from Flue Gases. 1. Development and Evaluation of Copper Oxide Sorbents

Dry Regenerable Metal Oxide Sorbents for SO2 Removal from Flue Gases. 1. Development and Evaluation of Copper Oxide Sorbents

Adsorption and Reaction of Sulfur Dioxide on Alumina and Sodium-Impregnated Alumina

Synthesis, Stability, and Sulfation Properties of Sol−Gel-Derived Regenerative Sorbents for Flue Gas Desulfurization

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Product

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Dry Regenerable Metal Oxide Sorbents for SO₂ Removal from Flue Gases. 1. Development and Evaluation of Copper Oxide Sorbents

Dry Regenerable Metal Oxide Sorbents for SO₂ Removal from Flue Gases. 1. Development and Evaluation of Copper Oxide Sorbents