Raman and infrared study of KHSO₄ crystal

Abstract

The Raman spectra of the low temperature phase single crystal of KHSO, and of polycrystalline KDSO, have been investigated at 300 and 9 0 K . Infrared spectra of polycrystalline samples have been recorded for comparison in the 4000 to 3 cm-' range. An assignment of bands due to internal vibrations to their symmetry species (Raman) and in terms of approximate type of motion is given. A distinction between the bands corresponding to cyclic dimers and infinite chains is possible in the case of the OH group and most skeletal stretching vibrations. An interpretation of lattice bands using an oriented gas model is proposed. Hydrogen bonding in the KHS04 crystal is discussed.

1H and 39K spin–lattice relaxation, ionic motion and Raman processes in the proton conducting KHSeO4 single crystal

“…Although the KHSeO 4 crystal is isomorphous with KHSO 4 and displays a similar hydrogen-bonding scheme, the phonon mechanism and molecular motion are very different. Our NMR results are consistent with, which the two crystals from IR results are dissimilar [8,9]. …”

Infrared and Raman spectroscopic studies of KHSO4 crystals

“…The remaining bands have been associated with the translatory lattice modes (Table 1). It may be mentioned that Goypiron et al 4 have considered librations of the dimer unit as a whole. However, this does not account for the librational motions of individual HSO, ions within the dimer unit.…”

Single Mo atoms paired with neighbouring Ti atoms catalytically decompose ammonium bisulfate formed in low-temperature SCR

“…Moreover, the disappearance of δ SO–H and the appearance of v asSO in the spectra of Mo 1 /TiO 2 compared to pure ABS indicates the transformation of HSO 4 − into SO 4 2− , 23 via a strong interplay between TiO 2 and HSO 4 − . The interaction resulted in obvious redshifts of v asS–O , indicating the increase of the S–O bond length and hence the reduction of its bonding energy, 39 which is favorable for the cleavage of two S–O bonds of SO 4 − so as to release SO 2 . Hence, the co-adsorption of NH 4 + and HSO 4 − of ABS on acid–base Mo–Ti dual sites was established, where Mo sites and Ti sites are responsible for the oxidation of NH 4 + and the reduction of HSO 4 − , respectively .…”