In Situ IR Spectrum of 12-Tungstophosphoric Acid Hexahydrate with Planar H5O2+

Hashimoto, Masaya; Koyano, Gaku; Mizuno, Noritaka

doi:10.1021/jp0485744

Cited by 23 publications

(13 citation statements)

References 45 publications

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“…, and ν as (W-O e -W), respectively [23]. These peaks were observed in all the FTIR spectra of M-CsPW as an indication that the doped metal atoms did not severely affect the Keggin structure of Cs-PW.…”

Section: Characterization Resultsmentioning

confidence: 79%

“…The FTIR spectrum of Cs-PW is dominated by four main bands at around 1078, 986, 887, and 802 cm-1. These bands can be assigned as νas(P-O), νas(W-O), νas(W-Oc-W), and νas(W-Oe-W), respectively [23]. These peaks were observed in all the FTIR spectra of M-CsPW as an indication that the doped metal atoms did not severely affect the Keggin structure of Cs-PW.…”

Section: Characterization Resultsmentioning

confidence: 85%

“…Hanefeld and coworkers [26] reported that the tetrahedral incorporation of Al 3+ in the silica matrix can generate Brønsted sites as well as Lewis acidic sites. On the other hand, Kozhevnikov [15,16,23] reported that the type of acidic site in CsPW is only Brønsted acidity. In another word, Al-TUD-1 possesses two different types of acidity which most likely has a positive effect on intermediate formation through the dehydration step.…”

Section: Discussionmentioning

confidence: 99%

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Liquid Phase Hydrogenation of MIBK over M/CsPW (M = Ag, Ru, Pt, and Pd)

et al. 2019

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Four different metal nanoparticles (metal = Ag, Ru, Pt, or Rh) were impregnated on the acidic cesium salt of tungstophosphoric acid Cs2.5H0.5PW12O40 (CsPW) with a loading amount of 2 wt%. The prepared catalysts were characterized by using X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FTIR), N2 sorption measurements, scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX). Results confirmed the formation of highly distributed metallic nanoparticle centres over the acidic CsPW. The catalytic activity of the prepared catalysts were evaluated in the liquid phase hydrogenation of methyl isobutyl ketone (MIBK) to 2-methylpentane (2-MP) at 453 K. Pd-CsPW showed the highest activity compared to other catalysts, where 10% conversion was obtained with 91% selectivity after 4 h’s reaction time.

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Section: Characterization Resultsmentioning

confidence: 79%

Section: Characterization Resultsmentioning

confidence: 85%

Section: Discussionmentioning

confidence: 99%

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Liquid Phase Hydrogenation of MIBK over M/CsPW (M = Ag, Ru, Pt, and Pd)

et al. 2019

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“…Some absorptions bands observed in the spectrum of the just-protonated lm are not present for the dehydrated lm, as it was reported for other crystalline hydrates, and attributed to water and/or hydrated hydronium ions. 67,68 Aer dehydration, more matter intercalated with H 3 O + ions is aerwards diffracting, involving the increase of the peak H intensity in XRD diagram. The lm F2 was analysed by TEM-EDXS and found to be fully free of potassium, demonstrating the total exchange of the potassium ions by the hydronium ions ( Fig.…”

Section: 3242mentioning

confidence: 99%

Epitaxial growth and cationic exchange properties of layered KNb₃O₈thin films

et al. 2017

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The KNb 3 O 8 potassium triniobate phase is a layered compound that shows excellent photocatalytic activity, intercalation properties and electrochemical performances. In this study, we report the synthesis of this niobate in thin film form. Thin films of layered KNb 3 O 8 phase were grown by pulsed laser deposition on (100)-oriented strontium titanate SrTiO 3 substrates using targets with different compositions and various deposition parameters. Samples were analyzed by X-ray diffraction, scanning and transmission electron microscopy, X-ray energy dispersive and Rutherford backscattering spectroscopies. This work shows that

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“…320 Similar experiments were used to follow the phase transitions aÀb-PbWO 4 near 450 1C. 330 The Raman spectra of M-W-Mn/SiO 2 catalysts (M = Li, Na, K, Ba, Ca, Fe, Co, Ni, Al) showed characteristic bands of surface WO 4 and WO 6 units. 321 Polarised IR and Raman spectra for NaBi(WO 4 ) 2 gave bands which were assignable using lattice dynamics calculations.…”

Section: Chromium Molybdenum and Tungstenmentioning

confidence: 99%

Vibrational spectra of transition element compounds

Davidson¹

Spectroscopic Properties of Inorganic and Organometallic Compounds

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Scandium, yttrium and the lanthanidesLaser-ablated scandium atoms react with H 2 O/N 2 mixtures to give matrix-trapped (Z 1 -N 2 )Sc(H)OH, (Z 1 -N 2 ) 2 Sc(H)OH and (Z 2 -N 2 )Sc(H)OH. nScH assignments, based on isotopic shifts and DFT calculations, are listed in Table 1. 1 The FTIR spectrum of Sc 3 N@C 80 gave assignments for two isomers-both with trigonal planar Sc 3 N units. 2 There is IR evidence that ScO + in noble gas matrices forms adducts [ScO(Ng) 5Àn (Ng 0 ) n ] + , where n = 0-5, Ng, Ng 0 = Ar, Kr, Xe. nScO assignments are given in Table 2. 3 Laser-evaporated ScO and N 2 , or Sc atoms and N 2 O form the matrix-trapped species OSc(Z 2 -N 2 ). This rearranges to an Z 1 -form (OScNN) on UV irradiation. nScO for the former is at 906.5 cm À1 , and for the latter at 894.6 cm À1 . 4 The Raman spectrum of [Sc(OSMe 2 ) 6 ] 3+ includes symmetric (a g ) and degenerate (e g ) nScO modes at 429, 451 cm À1 , respectively. The IR spectrum includes bands at 452 and 463 cm À1 due to e u , a u modes, respectively. 5 Ab initio calculations gave skeletal vibrational wavenumbers for Sc(mda) 3 ,where mda = C 3 H 3 O 2 À . 6 Raman studies have revealed grain-size effects for nanocrystalline ZrO 2 -Sc 2 O 3 , i.e. (ZrO 2 ) 1Àx (Sc 2 O 3 ) x , where x = 0.02-0.16. 7 The IR and Raman spectra of M 2 (M 0 O 4 ) 3 , where M = Sc, In, M 0 = Mo, W, gave characteristic assignments. For Sc 2 (MoO 4 ) 3 , variable-temperature spectra show the effects of the ferroelastic phase transition. 8 There have been two other reports of Raman studies of the phase behaviour of Sc 2 (MoO 4 ) 3 . 9,10 Raman spectroscopy was used to characterise intermediate compositions in the systems Ln 2 S 3 -Ln 0 2 S 3 , where Ln = La, Dy, L 0 = Sc, Lu etc. 11 The variable-temperature Raman spectra of Rb 2 KScF 6 (elpasolite) were used to follow temperature-induced phase transitions (using both ScF 6 and lattice modes). 12 The IR spectra of MCl 2 (k 3 -L)(thf), where M = Sc, Y, HL = (1), R = COOH, CSSH and CH 2 OH, include nMS near 300 cm À1 , and nMO (R = CH 2 OH) 570 cm À1 . 13 Characteristic Raman bands were seen at 204 and 42 cm À1 for a superconducting YNi 2 B 2 C single crystal. 14 The IR spectrum of Y 2 O 3 shows that nY-O shifts to lower wavenumber with decreased particle size. 15 Variable-temperature Raman spectroscopy was used to follow phase transitions of Y 2 O 3 -ZrO 2 . 16 IR and Raman spectra gave vibrational wavenumbers for orthorhombic M 2 BaCuO 5 , where M = Y, Ho or Gd, assigned using a short-range force constant model. 17 The Raman spectra of Ln 3 NbO 7 , where Ln = Y, La, Nd, Gd, in the temperature range 298-973K gave evidence for reversible structural disordering on increasing temperature. 18 IR data, together with previous Raman bands, gave assignments for KY 3 F 10 single crystals, supported by a normal coordinate analysis. 19 The IR and Raman spectra of [Ln(OH 2 ) 9 ] 3+ , where Ln = La, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb or Lu, gave detailed assignments for the LnO 9 unit (D 3h ). 20 Structural characteristics of MFeGe 2 O 7 , where M...

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In Situ IR Spectrum of 12-Tungstophosphoric Acid Hexahydrate with Planar H₅O₂⁺

Cited by 23 publications

References 45 publications

Liquid Phase Hydrogenation of MIBK over M/CsPW (M = Ag, Ru, Pt, and Pd)

Liquid Phase Hydrogenation of MIBK over M/CsPW (M = Ag, Ru, Pt, and Pd)

Epitaxial growth and cationic exchange properties of layered KNb₃O₈thin films

Vibrational spectra of transition element compounds

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In Situ IR Spectrum of 12-Tungstophosphoric Acid Hexahydrate with Planar H5O2+

Cited by 23 publications

References 45 publications

Liquid Phase Hydrogenation of MIBK over M/CsPW (M = Ag, Ru, Pt, and Pd)

Liquid Phase Hydrogenation of MIBK over M/CsPW (M = Ag, Ru, Pt, and Pd)

Epitaxial growth and cationic exchange properties of layered KNb3O8thin films

Vibrational spectra of transition element compounds

Contact Info

Product

Resources

About

In Situ IR Spectrum of 12-Tungstophosphoric Acid Hexahydrate with Planar H₅O₂⁺

Epitaxial growth and cationic exchange properties of layered KNb₃O₈thin films