Infrared studies of the adsorption and surface reactions of hydrogen sulfide and sulfur dioxide on some aluminas and zeolites

Deo, A. V.

doi:10.1016/0021-9517(71)90146-1

Cited by 138 publications

(27 citation statements)

References 6 publications

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“…The absorption bands present in the spectra shown in Figure 3 can be assigned with the aid from previous infrared studies of SO 2 absorption on surfaces [ Deo et al , 1971; Low et al , 1971; Schoonheydt and Lunsford , 1972; Goodsel et al , 1972; Davis and Lunsford , 1978; Chang , 1978; Lavalley et al , 1981; Harrison et al , 1983; Karge and Dalla Lana , 1984; Datta et al , 1985; Saur et al , 1986; Mitchell et al , 1996; Allen and Hayhurst , 1996; Waqif et al , 1992; Stark et al , 1996]. Many, if not all, of these previous studies on oxides were conducted so as to investigate the use of these oxides as potential adsorbents for emission abatement of SO 2 into the atmosphere.…”

Section: Resultsmentioning

confidence: 99%

A laboratory study of the heterogeneous uptake and oxidation of sulfur dioxide on mineral dust particles

et al. 2002

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[1] The heterogeneous uptake and oxidation of SO 2 on particle surfaces representative of mineral dusts found in the atmosphere have been investigated. These particles include metal oxides (e.g., hematite, corundum), calcite, and China loess. FT-IR spectroscopy was used to characterize surface-bound species following exposure to gaseous SO 2 . It was found that SO 2 irreversibly adsorbs as sulfite (SO 3 2À ) and/or bisulfite (HSO 3 À ) on all particle surfaces with the exception of SiO 2 . The adsorbed species can be oxidized to sulfate and/or bisulfate (SO 4 2À and/or HSO 4 À ) upon exposure to ozone. Knudsen cell reactor studies were done to measure heterogeneous uptake coefficients for SO 2 . Initial uptake coefficients, calculated using BET surface areas, g BET , are found to be lower than that found for water droplets. As shown here, the g BET value for China loess can be predicted from the reactivity of the single component oxide and carbonate particles along with the average composition of the dust sample, with each component weighted by its natural abundance in the sample.

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Section: Resultsmentioning

confidence: 99%

A laboratory study of the heterogeneous uptake and oxidation of sulfur dioxide on mineral dust particles

et al. 2002

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“…However at higher ratios the bands of sulfur species become evident. The small narrow band at 1330 cm −1 on the top of the broader nitrate band is due to physisorbed SO 2 (Chang, 1978;Datta et al, 1985;Deo and Dalla Lana, 1971;Goodman et al, 2001;Nakamoto, 1997;Ullerstam et al, 2002). The nitrate band is also to some extent distorted and the nitrite band is superimposed on the band of surface bound sulfate at 1240 cm −1 (Meyer et al, 1980;Schoonheydt and Lunsford, 1972;Ullerstam et al, 2002;Usher et al, 2002).…”

Section: Observed Productsmentioning

confidence: 97%

DRIFTS and Knudsen cell study of the heterogeneous reactivity of SO<sub>2</sub> and NO<sub>2</sub> on mineral dust

et al. 2003

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Abstract. The heterogeneous oxidation of SO 2 by NO 2 on mineral dust was studied using Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) and a Knudsen cell. This made it possible to characterise, kinetically, both the formation of sulfate and nitrate as surface products and the gas phase loss of the reactive species. The gas phase loss rate was determined to be first order in both SO 2 and NO 2 . From the DRIFTS experiment the uptake coefficient, γ , for the formation of sulfate was determined to be of the order of 10 −10 using the BET area as the reactive surface area. No significant formation of sulfate was seen in the absence of NO 2 . The Knudsen cell study gave uptake coefficients of the order of 10 −6 and 10 −7 for SO 2 and NO 2 respectively. There was no significant difference in uptake when SO 2 or NO 2 were introduced individually compared to experiments in which SO 2 and NO 2 were present at the same time.

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“…The adsorption characteristics of SO 2 over γ-Al 2 O 3 and sodium-impregnated γ-Al 2 O 3 have been reported previously in the literature (Deo and Dalla, 1971; Karge and Dalla, 1984;Saad et al, 1993). However, the simultaneous adsorption of SO 2 and NO x in a short-contact-time riser reactor (SNAP process) is a relatively new subject of study.…”

Section: Introductionmentioning

confidence: 84%

Development of a Transient Kinetic Model for the Simultaneous Adsorption of SO₂−NO_x over Na/γ-Al₂O₃ Sorbent

Wilde

Das

Heynderickx

et al. 2000

Ind. Eng. Chem. Res.

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A transient kinetic model has been developed for the simultaneous adsorption of SO 2 -NO x on Na/γ-Al 2 O 3 sorbent, using step response experimental data from a fixed-bed microreactor. The reactor temperature ranges from 367 to 407 K, and the molar SO 2/ NO ratio from 2 to 8 with and without NO 2 . SO 2 and NO 2 readily adsorb on the sorbent surface, producing SO 2 * and NO 2 * species. However, NO and O 2 only adsorb simultaneously and in the presence of sufficient SO 2 * on the surface. The proposed mechanism consists of chemisorption steps for SO 2 and NO 2 , whereas NO and O 2 are adsorbed simultaneously via an Eley-Rideal step involving a surface species derived from SO 2 *. The latter is followed by several consecutive steps involving more SO 2 * species as well as O 2 , leading to the formation of a complex with a stoichiometry of SO 2 / O 2 /NO of 10/5.5/1. The enhanced SO 2 sorption capacity in the presence of NO 2 is described adequately by considering that the adsorbed NO 2 * opens a new reaction path for SO 2 adsorption. Both the Langmuir ideal surface and the Elovich nonuniform surface kinetics were considered for the steps involving free sites. The latter were found to simulate the experimental data more closely, indicating that the interaction among various species and intrinsic surface nonuniformity are important.

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Infrared studies of the adsorption and surface reactions of hydrogen sulfide and sulfur dioxide on some aluminas and zeolites

Cited by 138 publications

References 6 publications

A laboratory study of the heterogeneous uptake and oxidation of sulfur dioxide on mineral dust particles

A laboratory study of the heterogeneous uptake and oxidation of sulfur dioxide on mineral dust particles

DRIFTS and Knudsen cell study of the heterogeneous reactivity of SO<sub>2</sub> and NO<sub>2</sub> on mineral dust

Development of a Transient Kinetic Model for the Simultaneous Adsorption of SO₂−NO_x over Na/γ-Al₂O₃ Sorbent

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Infrared studies of the adsorption and surface reactions of hydrogen sulfide and sulfur dioxide on some aluminas and zeolites

Cited by 138 publications

References 6 publications

A laboratory study of the heterogeneous uptake and oxidation of sulfur dioxide on mineral dust particles

A laboratory study of the heterogeneous uptake and oxidation of sulfur dioxide on mineral dust particles

DRIFTS and Knudsen cell study of the heterogeneous reactivity of SO&lt;sub&gt;2&lt;/sub&gt; and NO&lt;sub&gt;2&lt;/sub&gt; on mineral dust

Development of a Transient Kinetic Model for the Simultaneous Adsorption of SO2−NOx over Na/γ-Al2O3 Sorbent

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DRIFTS and Knudsen cell study of the heterogeneous reactivity of SO<sub>2</sub> and NO<sub>2</sub> on mineral dust

Development of a Transient Kinetic Model for the Simultaneous Adsorption of SO₂−NO_x over Na/γ-Al₂O₃ Sorbent