Kinetics of sulfur dioxide oxidation in slurries of activated carbon and concentrated sulfuric acid

Py, Xavier; Roizard, C.; Midoux, N.

doi:10.1016/0009-2509(95)00067-f

Cited by 13 publications

(6 citation statements)

References 11 publications

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“…Different reaction mechanisms have been proposed in the literature for the adsorption of NO and SO 2 . For SO 2 adsorption, the majority of studies coincide in proposing a first step where SO 2 is adsorbed on the surface of the activated carbon. ,, Davini suggested the basic surface groups as the sites responsible for the dissociative chemisorption of SO 2 . Bagreev et al showed that the nitrogen species present in the activated carbon, as pyridinic-N and quaternary-N, have a favorable influence on SO 2 adsorption.…”

Section: Resultsmentioning

confidence: 99%

Surface Complexes Formed during Simultaneous Catalytic Adsorption of NO and SO₂ on Activated Carbons at Low Temperatures

et al. 2006

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Simultaneous adsorption of NO and SO 2 on activated carbon provides an adequate alternative to control the low concentration emissions of these air pollutants. The surface complexes formed during the NO and SO 2 adsorptions at 30 °C were studied by X-ray photoelectron spectroscopy (XPS) and temperature-programmed desorption (TPD). The effects of the addition of copper supported on the carbon and O 2 on the gas stream were studied. The presence of copper enhanced the chemical adsorption of both NO and SO 2 . In the simultaneous adsorption of NO and SO 2 , SO 2 inhibited the adsorption of NO, while SO 2 adsorption was notably improved. The reaction carried out under a NO/SO 2 /O 2 gas mixture showed a synergic effect increasing the formation of surface complexes. The addition of copper assisted the oxygen transfer to the carbon matrix.

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Section: Resultsmentioning

confidence: 99%

Surface Complexes Formed during Simultaneous Catalytic Adsorption of NO and SO₂ on Activated Carbons at Low Temperatures

et al. 2006

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“…The oxidation of SO 2 to H 2 SO 4 (sulfates) on catalysts takes place via the Eli-Riedil (ER) [79][80][81], Langmuir-Hinshelwood (LH) [81,82] or Mars-van Krevelen (MvK) [81] mechanisms: the LH and ER mechanisms account for the oxidation of SO 2 (adsorbed or from the gas phase) through surface-activated molecular oxygen, while the MvK mecha nism is closely related to surface O lattices that gene rate atomic oxygen vacancies during the formation of SO 3 and H 2 SO 4 . Since the co-adsorption of SO 2 and O 2 on carbon catalysts has a large adsorption energy (-1.03 eV) compared to the individual adsorption of SO 2 (-0.45 eV) or O 2 , then, according to [75], the oxidation of SO 2 on carbon materials is more likely to occur by the LH mechanism, compared to the ER mechanism.…”

Section: Phisical Chemistrymentioning

confidence: 99%

Impregnated Activated Carbon Materials for Respiratory Purpose. Chemisorption of Sulfur Dioxide

Khoma,

Vodzinskii,

Klimov

2023

Ukr. Chem. Journ.

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The review is devoted to the use of impregnated activated carbon materials as chemisorbents of sulfur (IV) oxide. General methods for obtaining ordinary activated carbon, preparation of raw materials, their chemical activation with alkalis and acids followed by heat treatment (carbonization) in an inert environment or in the presence of a gaseous oxidizer, the role of acid-base and redox catalysts in this process are considered. The influence of the chemical composition of the activated carbon surface, the presence of functional groups, and their acid-base properties, as well as the products of surface reactions on the peculiarities of sulfur (IV) oxide adsorption is analyzed from the point of view of SO2 removal efficiency and the possibility of SO2 regeneration. An important role in these processes is played by the pore size, the possibility of co-adsorption of water, and the presence of an oxidant. The nature of adsorbent-adsorbate interactions on the surface of activated carbon, their energy, in particular, the contribution of so-called "physical" adsorption, van der Waals forces, hydrogen bonding, and the influence of surface functional groups are discussed. The activation of carbon raw materials with nitrogen-containing compounds leads to the N-doping of the surface, which increases the efficiency of SO2 adsorption, facilitating not only van der Waals and electrostatic interactions, but also S←N binding. The influence of oxygen and oxygen-containing functional groups on SO2 adsorption is also discussed. To obtain impregnated activated carbon for SO2 absorption, the original activated carbon of the required quality is impregnated with solutions of inorganic and organic compounds that remain on the inner surface of the activated carbon after drying. Impregnation blocks partly the porosity of activated carbon, but makes it more capable of chemical adsorption. Chemisorption, in which certain chemical bonds are formed between the surface of the activated carbon and the compound being adsorbed, is more selective than physical adsorption, where the size of molecules is critical for an effective capture process. It can be noted that unlike inorganic alkalis, which spoil the porous structure of activated carbon, treatment with a solution of ammonia or organic N-containing bases promotes SO2 absorption. A special place in gas purification is occupied by activated carbon impregnated with ionic liquids, non-aqueous solvents being used for impregnation. A separate issue of the chemisorption of sulfur (IV) oxide by samples of impregnated activated carbon based on d-metals will be discussed in detail below.

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“…Other authors , have reported that the activity of carbon for SO 2 oxidation in the presence of water can be enhanced by doping with typical oxidation catalysts or by impregnating the carbon with Pt or Pd. In recent work, we have shown that the Centaur carbon produced by Calgon Carbon of Pittsburgh is active for the oxidation, performing as well as other activated carbon impregnated with noble metals at 0.1 wt %. , …”

Section: Introductionmentioning

confidence: 99%

High-Efficiency Structured-Packing Catalysts with Activated Carbon for SO₂ Oxidation from Flue Gas

et al. 1997

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Coiled screen or Sulzer CY gauze structured packings, loaded with an activated carbon treated to make it partially hydrophobic, were employed to investigate the removal of SO2 from a stack gas. Measurements were made of SO2 removal and its conversion to H2SO4 and gas-side pressure drop as a function of gas and liquid loadings, temperature, and method of operation (continuous liquid flow vs intermittent liquid flow). Both packings exhibited remarkably high catalytic efficiency in terms of SO2 converted per gram of carbon, as well as high conversions of SO2 to H2SO4 and low-pressure drops. Although the Sulzer CY packing displayed the lowest pressure drop per meter of packing depth, the coiled screen provided higher removal of SO2 per volume of packing. The performances of each were close enough that a choice between them would require an economic analysis.

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Kinetics of sulfur dioxide oxidation in slurries of activated carbon and concentrated sulfuric acid

Cited by 13 publications

References 11 publications

Surface Complexes Formed during Simultaneous Catalytic Adsorption of NO and SO₂ on Activated Carbons at Low Temperatures

Surface Complexes Formed during Simultaneous Catalytic Adsorption of NO and SO₂ on Activated Carbons at Low Temperatures

Impregnated Activated Carbon Materials for Respiratory Purpose. Chemisorption of Sulfur Dioxide

High-Efficiency Structured-Packing Catalysts with Activated Carbon for SO₂ Oxidation from Flue Gas

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Kinetics of sulfur dioxide oxidation in slurries of activated carbon and concentrated sulfuric acid

Cited by 13 publications

References 11 publications

Surface Complexes Formed during Simultaneous Catalytic Adsorption of NO and SO2 on Activated Carbons at Low Temperatures

Surface Complexes Formed during Simultaneous Catalytic Adsorption of NO and SO2 on Activated Carbons at Low Temperatures

Impregnated Activated Carbon Materials for Respiratory Purpose. Chemisorption of Sulfur Dioxide

High-Efficiency Structured-Packing Catalysts with Activated Carbon for SO2 Oxidation from Flue Gas

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Surface Complexes Formed during Simultaneous Catalytic Adsorption of NO and SO₂ on Activated Carbons at Low Temperatures

Surface Complexes Formed during Simultaneous Catalytic Adsorption of NO and SO₂ on Activated Carbons at Low Temperatures

High-Efficiency Structured-Packing Catalysts with Activated Carbon for SO₂ Oxidation from Flue Gas