Evans holes in the infrared spectra of some transition metal formate dihydrates

Tewari, G. D.; Khandelwal, D. P.; Bist, H. D.; Tayal, V. P.

doi:10.1139/v83-471

Cited by 16 publications

(4 citation statements)

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“…After completing the discussion about IR spectra recorded during NH 3 adsorption, we have to point out that a more precise interpretation of IR bands centered within the ν N–H stretching region (3500–2200 cm –1 ) was purposely avoided. Interaction between strong and weak bands within the same energy range can create Evans transmission windows that can be misleading for spectra postprocessing …”

Section: Resultsmentioning

confidence: 99%

“…Interaction between strong and weak bands within the same energy range can create Evans transmission windows that can be misleading for spectra postprocessing. 58 The thermal stability of the above-mentioned NH 3 adspecies was evaluated through the TPD experiment, illustrated in Figure 5. Overall, 1.64 mol/kg zeolite NH 3 were stored and released during the adsorption and TPD phases.…”

Section: Methodsmentioning

confidence: 99%

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IR Spectroscopy Analysis and Kinetic Modeling Study for NH₃ Adsorption and Desorption on H- and Fe-BEA Catalysts

et al. 2013

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Among different types of Fe-exchanged zeolites, Fe-BEA exhibits very promising surface properties for developing efficient urea or NH 3 -SCR systems. In this work, dedicated experimental and kinetic modeling studies were performed in order to elucidate mechanistic aspects related to NH 3 storage and release on these catalysts. A series of NH 3 adsorption and desorption experiments were performed over both H-and Fe-exchanged BEA zeolites, taking into account a broad range of operating conditions. Coupling FTIR spectroscopy, surface NH 3 adspecies were characterized. NH 3 gaseous concentration profiles were subsequently simulated by means of a detailed multisite kinetic model, being able to account for low-temperature adsorption phenomena. Finally, correlations between surface acidity and model sites were enabled by comparing IR spectroscopy and model predicted results, leading to the development of a phenomenological semidetailed, multisite kinetic modeling approach.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

IR Spectroscopy Analysis and Kinetic Modeling Study for NH₃ Adsorption and Desorption on H- and Fe-BEA Catalysts

et al. 2013

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“…The assignments of the bands are done by analogy with those of metal formate dihydrates. (HEYNS, 1985 (a) (b), TEWARI et al, 1982TEWARI et al, , 1983.…”

Section: Resultsmentioning

confidence: 99%

IR and X‐Ray Powder Diffraction Studies on Ba₂Me(HCOO)₆. 4 H₂O (Me = Co, Ni, Zn)

Stoilova

Koleva

1997

Cryst. Res. Technol.

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1997 1 6 1 865-873 IR and X-Ray Powder Diffraction Studies on Ba2Me(HCOO)s. 4 H20 (Me = Co, Ni, Zn)It has been established that the double salts Ba&Ie(HCOO)6.4 HzO (Me = Co, Ni, Zn) are isostructural with Ba*Cu(HCOO)G. 4 H2O (trinclinic space group P1 = Cl). The infrared spectra of the double salts and their deuterated analogues have been recorded and the internal modes of the formate groups and the water molecules are reported. The analysis of the infrared spectra indicates that some of the internal formate modes (v3 and v4) reflect the existence of three crystallographically independent formate ions. The comparatively large frequency separations between the asymmetric and symmetric C-0 stretching modes is a criterion for the different C-0 bond lengths within each formate groups. The number and the positions of the bands in the high frequency range (4000-2300 cm-') are evidence for the existence of two inequivalent water molecules. The apkarance of four uncoupled

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“…quality (Merck). The double salt CuSr(HCOO) 4 was prepared by heating of CuSr(HCOO) 4 .4H 2 O crystals at 100°C for several hours (CuSr(HCOO) 4 .4H 2 O crystals were prepared by crystallization from copper strontium formate solutions at 50°C (VASSILEVA, 1995) ). The double salt CaCd(HCOO) 4 was prepared according to the solubility diagram of the cadmium formate-calcium formate-water system (VASSILEVA, 1998).…”

Section: Methodsmentioning

confidence: 99%

X-ray Powder Diffraction Study and Vibrational Spectra of Calcium Cadmium Formate

Stoilova

Vassileva

1999

Cryst. Res. Technol.

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Cryst. Res. Technol. 34 1999 3 397-401It has been established that the double salt CaCd(HCOO) 4 is isostructural with CuSr(HCOO) 4 . It crystallizes in the monoclinic space group P2/c -C2h 4 with lattice parameters: a = 7.5309(2)Å, b = 8.8815(4)Å, c = 6.4267(2)Å, β = 92.153(2), and V = 429.55(3)Å 3 . The analysis of the infrared spectra shows that the internal formate modes reflect the existence of two crystallographically inequivalent formate groups in the crystal lattices. The additional split of each formate mode into two components is due to the correlation field splitting. The frequency separations between the asymmetric and symmetric C-O stretching modes (ν 4 -ν 2 ) are explained in terms of different C-O bond lengths within each formate group and the frequency separation of the ν 4 components in terms of different C-O bond lengths of the formate groups.

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Evans holes in the infrared spectra of some transition metal formate dihydrates

Abstract: Evans holes have been identified in OH(OD) stretching regions in the ir spectra of M(HCOO)2•2X2O (M = Mn, Co, Ni and Zn; X = H, D) and attributed to Fermi interaction between the stretching mode and an overtone of the bending mode of water.

Cited by 16 publications

References 4 publications

IR Spectroscopy Analysis and Kinetic Modeling Study for NH₃ Adsorption and Desorption on H- and Fe-BEA Catalysts

IR Spectroscopy Analysis and Kinetic Modeling Study for NH₃ Adsorption and Desorption on H- and Fe-BEA Catalysts

IR and X‐Ray Powder Diffraction Studies on Ba₂Me(HCOO)₆. 4 H₂O (Me = Co, Ni, Zn)

X-ray Powder Diffraction Study and Vibrational Spectra of Calcium Cadmium Formate

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Evans holes in the infrared spectra of some transition metal formate dihydrates

Abstract: Evans holes have been identified in OH(OD) stretching regions in the ir spectra of M(HCOO)2•2X2O (M = Mn, Co, Ni and Zn; X = H, D) and attributed to Fermi interaction between the stretching mode and an overtone of the bending mode of water.

Cited by 16 publications

References 4 publications

IR Spectroscopy Analysis and Kinetic Modeling Study for NH3 Adsorption and Desorption on H- and Fe-BEA Catalysts

IR Spectroscopy Analysis and Kinetic Modeling Study for NH3 Adsorption and Desorption on H- and Fe-BEA Catalysts

IR and X‐Ray Powder Diffraction Studies on Ba2Me(HCOO)6. 4 H2O (Me = Co, Ni, Zn)

X-ray Powder Diffraction Study and Vibrational Spectra of Calcium Cadmium Formate

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IR Spectroscopy Analysis and Kinetic Modeling Study for NH₃ Adsorption and Desorption on H- and Fe-BEA Catalysts

IR Spectroscopy Analysis and Kinetic Modeling Study for NH₃ Adsorption and Desorption on H- and Fe-BEA Catalysts

IR and X‐Ray Powder Diffraction Studies on Ba₂Me(HCOO)₆. 4 H₂O (Me = Co, Ni, Zn)