A novel FTIR method for studying mixed gas adsorption at low concentrations: H2O and CO2 on NaX zeolite and γ-alumina

Rege, Salil U.; Yang, Ralph T.

doi:10.1016/s0009-2509(01)00095-1

Cited by 171 publications

(139 citation statements)

References 33 publications

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“…The peak located at 1560 cm À1 is assigned to surface hydrogen thiocarbonate ðHSCO À 2 Þ species as an intermediate of the hydrolysis of COS (Lavalley et al, 1979;Hoggan et al, 1994). At the same time, the bands at 1653 and 1437 cm À1 due to surface HCO À 3 species are also appeared (Amenomiya et al, 1977;Morterra et al, 1977;Lavalley et al, 1979;Rege and Yang, 2001). The subtract spectrum from b to a (amplified 10 times) also shows that, after the lawn soil exposed to COS in the closed system for 60 min, the peaks for gas-phase CO 2 , surface HCO À 3 , and HSCO À 2 species increase in intensity with time, while the peaks for gaseous COS gradually decrease.…”

Section: The Conversion Of Cos In the Lawn Soilmentioning

confidence: 96%

“…Strong peaks due to gasphase COS appeared at 2071 and 2052 cm À1 (Lavalley et al, 1979). The peaks at 2361 and 2337 cm À1 are attributed to gaseous carbon dioxide ðCO 2 Þ (Amenomiya et al, 1977;Morterra et al, 1977;Rege and Yang, 2001). The peak located at 1560 cm À1 is assigned to surface hydrogen thiocarbonate ðHSCO À 2 Þ species as an intermediate of the hydrolysis of COS (Lavalley et al, 1979;Hoggan et al, 1994).…”

Section: The Conversion Of Cos In the Lawn Soilmentioning

confidence: 98%

“…In addition, the bands at 1057 and 1040 cm À1 are due to surface SO 2À 3 species (Chang, 1978;Laperdrix et al, 2000;Goodman et al, 2001). The negative peak observed at 1653 cm À1 and a broad peak ranging from 3000 to 3500 cm À1 , were assigned to adsorbed water (Meunier and Ross, 2000;Goodman et al, 2001;Rege and Yang, 2001). As the subtract spectrum shown, after the lawn soil exposed to COS in the closed system for 6 h, the peaks for gas-phase CO 2 , surface HCO À 3 , and SO 2À 4 species increase in intensity with time, while the peaks for gaseous COS, adsorbed water and surface SO 2À 3 species gradually decrease.…”

Section: Article In Pressmentioning

confidence: 99%

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Uptake and conversion of carbonyl sulfide in a lawn soil

Liu

Geng

et al. 2007

Atmospheric Environment

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Carbonyl sulfide (COS) exchange fluxes between a lawn soil and the atmosphere as well as influencing factors (temperature and water content of soil) were investigated using a static cuvette. The optimal soil temperature and water content for COS consumption were about 298 K and 12.5%, respectively. The converting products of the consumed COS in the lawn soil were researched using in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The peaks of gas-phase products of CO 2 and surface HCO À 3 , HS À , SO 2À 3 , HSO À 3 , and SO 2À 4 species were observed. The possible mechanism of COS conversion in the lawn soil was discussed. The conversion rates of consumed COS into water-soluble sulfate in the lawn soil were studied by ion chromatography (IC). The experimental results show that about 50% sulfur from the soil consumed COS was eventually converted into water-soluble sulfate. r

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Section: The Conversion Of Cos In the Lawn Soilmentioning

confidence: 96%

Section: The Conversion Of Cos In the Lawn Soilmentioning

confidence: 98%

Section: Article In Pressmentioning

confidence: 99%

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Uptake and conversion of carbonyl sulfide in a lawn soil

Liu

Geng

et al. 2007

Atmospheric Environment

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“…In the DRIFT spectra of the samples recorded at room temperature before vacuum, a broad band in the range of 2500-3800 cm À1 was observed that was probably due to the abundance of water molecules present on the surface, which obscures the isolated OH stretching band. [13] Common bands were detected at 3610, 3410, 3230, 2920, 1630, 1200, 1140, and 1060 cm À1 in the spectra of the samples recorded under these conditions.…”

Section: Temperature-programmed Diffuse Reflectance Fourier Transformmentioning

confidence: 87%

“…Clinoptilolite and its Na, K, Ca, H, and NH 4 forms were tested for their applications in drying of air, hydrocarbons, H 2 , etc. [4,[11][12][13] Adsorption drying with zeolite was proposed as an alternative method to improve the energy efficiency of industrial drying. [14][15][16][17][18] The principle of zeolite drying is based on dehumidification of air before feeding to the dryer.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Dehydration Behavior of a Natural, Ammonium Hydroxide, and Thermally Treated Zeolitic Tuff

2011

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Aqueous NH 4 OH-treated and subsequently calcined forms of local natural zeolitic tuff were characterized by different techniques including scanning electron microscopy (SEM), X-ray powder diffraction, inductively coupled plasma-atomic emission spectroscopy (ICP-AES), volumetric N 2 adsorption at À196 C, thermogravimetry (TG), differential scanning calorimetry (DSC), and transmittance infrared spectroscopy. The dehydration behavior of the samples was investigated using an in situ temperature-programmed diffuse reflectance Fourier transform infrared spectroscopy (TP-DRIFTS) method under vacuum. The DRIFTS spectra recorded yielded information about the effect of the NH 4 OH treatment and subsequent calcination on the dehydration behavior of the natural zeolite. Changes in the infrared bands corresponding to vibrations of the OÀH and NÀH bonds upon in situ heating under vacuum were analyzed.Keywords Ammonium hydroxide treatment; Characterization;Clinoptilolite; Dehydration; DRIFTS INTRODUCTIONNatural zeolites constitute a group of minerals having open aluminosilicate frameworks containing channels and cavities that accommodate cations and water molecules. Generally, these cations are exchangeable and the water molecules can be removed or replaced reversibly without disrupting the framework. The presence of water in the pores hinders adsorption of other molecules; thus adsorption and catalytic properties of zeolites are directly related to their water content. Water is adsorbed into zeolites by filling oxygen-lined channels and hydrating the cations present in the channels. The observed macroscopic thermal behavior of a zeolite depends on the type, amount, and position of the extraframework cations within the structure, their coordination to water molecules, their interactions with framework oxygen atoms, the presence of other water molecules, Si=Al ratio, time, temperature, pressure, and heating rate.Dehydration behaviors of clinoptilolite have been investigated by various analytical techniques including

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Enhanced Direct Air Carbon Capture on NaX Zeolite by Electric‐Field Enhanced Physical Adsorption and In Situ CO₂ Synergistic Effects of Cold Plasma

Shen,

Kong,

Guo

et al. 2024

Adv Funct Materials

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Direct air carbon capture (DAC) is vital to achieving negative CO2 emissions, with physical adsorption offering a cost‐effective and energy‐efficient solution. an advanced zeolite modification technique is presented using cold plasma, which enhances the CO2 adsorption efficiency of NaX zeolite by 11.5% after just 60 min. This method utilizes the electric field to reorganize cation distribution and pore structure and significantly improve the adsorption capacity, efficiency, and selectivity. Compared to traditional methods, this technique is simpler and more effective, as demonstrated through first‐principles calculations, thermodynamics, kinetics, and adsorption equilibrium studies.

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A novel FTIR method for studying mixed gas adsorption at low concentrations: H2O and CO2 on NaX zeolite and γ-alumina

Cited by 171 publications

References 33 publications

Uptake and conversion of carbonyl sulfide in a lawn soil

Uptake and conversion of carbonyl sulfide in a lawn soil

Characterization and Dehydration Behavior of a Natural, Ammonium Hydroxide, and Thermally Treated Zeolitic Tuff

Enhanced Direct Air Carbon Capture on NaX Zeolite by Electric‐Field Enhanced Physical Adsorption and In Situ CO₂ Synergistic Effects of Cold Plasma

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A novel FTIR method for studying mixed gas adsorption at low concentrations: H2O and CO2 on NaX zeolite and γ-alumina

Cited by 171 publications

References 33 publications

Uptake and conversion of carbonyl sulfide in a lawn soil

Uptake and conversion of carbonyl sulfide in a lawn soil

Characterization and Dehydration Behavior of a Natural, Ammonium Hydroxide, and Thermally Treated Zeolitic Tuff

Enhanced Direct Air Carbon Capture on NaX Zeolite by Electric‐Field Enhanced Physical Adsorption and In Situ CO2 Synergistic Effects of Cold Plasma

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Product

Resources

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Enhanced Direct Air Carbon Capture on NaX Zeolite by Electric‐Field Enhanced Physical Adsorption and In Situ CO₂ Synergistic Effects of Cold Plasma