An infrared and Solid-State NMR study of the H2S adsorption on basic zeolite

Gaillard, Marina; Montouillout, V.; Maugé, Françoise; Fernandéz, Christian

doi:10.1016/s0167-2991(04)80694-3

Cited by 11 publications

(6 citation statements)

References 24 publications

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“…This result can be explained by a dissociative adsorption of H 2 S leading to the formation of water or other species containing OH groups with the diffusivities reported above. SH – anions, which are expected to have resonance at around −3 ppm, were also not observed by MAS NMR or MAS PFG NMR under our experimental conditions. It is likely that a residual line broadening and low concentration of the SH – anion line prevented the observation of these anions in the studied samples.…”

Section: Resultsmentioning

confidence: 58%

“…The diffusivity of these species is around 3 × 10 –9 m 2 /s (Figure S6), which can be tentatively assigned to confined water in exchange with water in the gas phase of the sample or diffusion of water in the part of the ZIF-8 sample destroyed by reactions with H 2 S. This diffusivity was not observed using PFG NMR without MAS because of the significant line broadening and short T 1 relaxation time (8 ms). Molecular H 2 S is expected to have a chemical shift in the range between around 0 and 2 ppm . We have not observed an NMR line in this range in the H 2 S-loaded samples using MAS NMR or MAS PFG NMR (5 kHz MAS rate).…”

Section: Resultsmentioning

confidence: 61%

“…Molecular H 2 S is expected to have a chemical shift in the range between around 0 and 2 ppm. 45 We have not observed an NMR line in this range in the H 2 S-loaded samples using MAS NMR or MAS PFG NMR (5 kHz MAS rate). This result can be explained by a dissociative adsorption of H 2 S leading to the formation of water or other species containing OH groups with the diffusivities reported above.…”

Section: ■ Results and Discussionmentioning

confidence: 64%

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Influence of Hydrogen Sulfide Exposure on the Transport and Structural Properties of the Metal–Organic Framework ZIF-8

et al. 2018

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The interaction between hydrogen sulfide and ZIF-8 was studied via structural characterizations and guest molecule diffusion measurements. It was found that hydrogen sulfide reacts with the ZIF-8 external particle surface to form a surface barrier that excludes the uptake of larger molecules (ethanol) and slows down the uptake of smaller molecules (carbon dioxide). Nonetheless, bulk transport properties were unaltered, as supported by pulsed field gradient nuclear magnetic resonance studies. Dispersion-corrected density functional theory calculations revealed that H2S is consumed by reactions occurring at the ZIF external surface. These reactions result in water and defect formation, both of which were found to be exothermic and independent of both crystallographic facets ({001} and {110}) and surface termination. We concluded that these surface reactions lead to structural and chemical changes to the ZIF-8 external surface that generate surface barriers to molecular transport.

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Section: Resultsmentioning

confidence: 58%

Section: Resultsmentioning

confidence: 61%

Section: ■ Results and Discussionmentioning

confidence: 64%

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Influence of Hydrogen Sulfide Exposure on the Transport and Structural Properties of the Metal–Organic Framework ZIF-8

et al. 2018

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“…By choosing among the various aluminosilicate frameworks available, the porosity of the zeolite can be adjusted. By tuning the Si/Al ratio, the distribution of the extraframework cations, and the adsorbate content, zeolites can be obtained with a large spectrum of acido-basic properties: zeolites can be used as a basic material for a low Si/Al ratio and for alkali-exchanged cations or as an acidic material for a high Si/Al ratio and/or protons. , With a low Si/Al ratio and a low proton content, Al-rich faujasite CuY containing both copper and alkali cations catalyzes NO reduction efficiently and selectively . To establish detailed relationships between the structure, the reactivity, and the thermodynamic properties of these zeolites, experimental and theoretical studies were developed to obtain quantitative data. , It is important to know where the active metallic center is located and how the different cations are distributed inside the zeolites because the extraframework cations play a major role in the reactivity.…”

Section: Introductionmentioning

confidence: 99%

Cooperative Cation Migrations upon CO Addition in Cu^I- and Alkali-Exchanged Faujasite: A DFT Study

2010

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International audienceCO adsorption in Al-rich faujasite zeolite containing copper and alkali cations has been investigated using DFT methods in order to determine how CO interacts and may modify the original position of the cations. Whether a cluster or a periodic model is used, addition of CO induces the formation of stable complexes labeled DI(CO) in which CO interacts by both its C-end and its O-end, resulting from a cooperative rearrangement of cations. In addition to a CuI migration from site II to the supercage, a migration of alkali from site III′ to site III may occur. DI(CO) also induces a downshift of the νCO mode in comparison with the complex containing CO interacting with a single cation, SI(CO). These results suggest a new assignment of the IR spectra of CO adsorbed in YCuI and YNa+: for YCuI, the upshifted signal at ca. 2160 cm-1 in comparison with νCOgas at 2143 cm-1 could be assigned to a SI(CO) structure, whereas the downshifted signal at ca. 2140 cm-1 could be assigned to a DI(CO) complex. For YNa+, the upshifted signal at ca. 2170 cm-1 could be assigned to SI(CO) NaSII · · ·CO and/or to DI(CO) NaSII · · ·OC· · · NaSIII′, whereas the downshifted signal at ca. 2122 cm-1 could be assigned to DI(CO) complex NaSII · · ·CO· · ·NaSIII′. This study shows that the DI(CO) interaction is a key ingredient for understanding the metal-exchanged zeolite properties

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“…This adsorption can be dissociative or non-dissociative. [8,9] It has been suggested that the dissociative adsorption of H 2 S depends on the amount and position of the exchanged cations. [10,11] An interesting study was conducted by Pavlova et al [12] testing 13X with several cations (Na + , K + , Li + , H + , Ca 2 + , Mg 2 + , and La 3 + ) finding that the factor that determines the amount of adsorbed H 2 S, is the increase in accessibility of the cavities by replacing Na + with Ca 2 + or Mg 2 + cations.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Sulfide Adsorption Mechanism and Breakthrough Curves of Highly Stable Na‐, Na‐H‐, Ca‐ and K‐Mordenites

Villarreal,

Ramírez,

Cuevas‐García

et al. 2024

ChemPlusChem

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Hydrogen sulfide (H2S) is a hazardous gas found in natural gas and biogas, lethal over 100 ppm. When released into the atmosphere, it can turn into sulfur dioxide. One option to remove H2S is using porous materials such as zeolites. Among them, mordenite stands out due to its channel structure, wide availability, and low cost. In this work, we evaluated the H2S adsorption capacity of mordenite using a volumetric static method. The results show the adsorption capacity of H2S in mordenite varies with the exchanged cation. The highest was measured in Na‐mordenite (~4.08 mmol H2S/g mordenite). The experimental breakthrough curves for this zeolite confirmed Langmuir‐type adsorption and strong affinity between Na+ cations and H2S. Despite this interaction, the XRD diffractograms of Na‐mordenite show that the material retained its crystalline structure. More information about the differences in the amount of H2S adsorbed in the zeolites caused by the change in exchanged cation was obtained by H2S adsorption followed by FTIR spectroscopy. The spectra show differences in the position of the peaks related to the different adsorption modes of H2S caused by a change in the polarizing power of the cations due to their charge and position inside the zeolite pores.

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An infrared and Solid-State NMR study of the H2S adsorption on basic zeolite

Cited by 11 publications

References 24 publications

Influence of Hydrogen Sulfide Exposure on the Transport and Structural Properties of the Metal–Organic Framework ZIF-8

Influence of Hydrogen Sulfide Exposure on the Transport and Structural Properties of the Metal–Organic Framework ZIF-8

Cooperative Cation Migrations upon CO Addition in Cu^I- and Alkali-Exchanged Faujasite: A DFT Study

Hydrogen Sulfide Adsorption Mechanism and Breakthrough Curves of Highly Stable Na‐, Na‐H‐, Ca‐ and K‐Mordenites

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An infrared and Solid-State NMR study of the H2S adsorption on basic zeolite

Cited by 11 publications

References 24 publications

Influence of Hydrogen Sulfide Exposure on the Transport and Structural Properties of the Metal–Organic Framework ZIF-8

Influence of Hydrogen Sulfide Exposure on the Transport and Structural Properties of the Metal–Organic Framework ZIF-8

Cooperative Cation Migrations upon CO Addition in CuI- and Alkali-Exchanged Faujasite: A DFT Study

Hydrogen Sulfide Adsorption Mechanism and Breakthrough Curves of Highly Stable Na‐, Na‐H‐, Ca‐ and K‐Mordenites

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Cooperative Cation Migrations upon CO Addition in Cu^I- and Alkali-Exchanged Faujasite: A DFT Study