Author
L. Zsinka
Bio: L. Zsinka is an academic researcher from Nuclear Regulatory Commission. The author has contributed to research in topics: Ion exchange & Adsorption. The author has an hindex of 1, co-authored 1 publications receiving 40 citations.
Topics: Ion exchange, Adsorption, Alkali metal, Microcrystalline, Phosphate
Papers
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TL;DR: A microcrystalline cerium(IV) phosphate with formula CeH2P2O8.1.33H2O has been synthesized and characterized by its X-ray diffraction pattern as discussed by the authors.
40 citations
Cited by
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TL;DR: In this article, a new inorganic ion-exchanger with the formula Ti(HPO4)2·2H2O and its ion exchange properties towards sodium and strontium ions was reported and discussed.
95 citations
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TL;DR: In this paper, the effect of the degree of crystallinity of zirconium phosphate on its ion-exchange properties and electrical conductivity, the dependence of its selectivity for large cations on steric hindrance and the catalytic effect of small amounts of sodium ions on the exchange of large hydrated cations are discussed.
85 citations
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TL;DR: In this article, the effects of calcination temperature (Tc) on the oxygen storage and release properties of CeO2 and Ce0.8Zr0.2O2 solids were investigated.
Abstract: The present work reports on the effects of calcination temperature (Tc) on the oxygen storage and release properties of CeO2 and Ce0.8Zr0.2O2 solids deliberately contaminated with CePO4. Pulsed-feed and stepped-feed dynamic OSC, 18O2 temperature programmed isotopic exchange (TPIE), and 18O2 transient isothermal isotopic exchange experiments were conducted in order to investigate the alteration of the OSC process by the applied Tc. The characterisation of the solids calcined at a low temperature (ca. 873 K) by XRD, Raman and XPS confirms the presence of CePO4 crystallites covering to a large extent the surface of the solid metal oxides. However, calcination at a higher temperature (ca. 1273 K) results in the sintering of the crystallites of the metal oxides and CePO4, the sintering of the latter being more intense. This sintering effect causes the rearrangement of the surface of CeO2 and Ce0.8Zr0.2O2 solids giving rise to the partial uncovering of it from CePO4. The OSC properties of all P-contaminated solids were found to be largely worse than the corresponding ones of P-free solids due to the presence of CePO4 in the surface/subsurface region of the former solids. However, the OSC properties of the phosphated Ce0.8Zr0.2O2 solid were partially recovered after calcination in air at 1273 K. This effect was not observed in the case of CeO2 and it must be related to the surface/subsurface reorganization of the solid driven by calcination at 1273 K, and also to the intrinsic OSC properties of Ce0.8Zr0.2O2 solid. Therefore, CexZr1−xO2 solid solutions appear to be excellent oxygen storage materials for commercial TWC applications and their OSC properties display an enhanced resistance against P-deterioration compared to those of pure CeO2.
80 citations
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TL;DR: In this article, the preparation procedure of fibrous polyacrylonitrile thorium (IV) phosphate (PANThP) was investigated and a new fibrous ion exchanger was characterized on the basis of SEM and ion exchange studies.
73 citations
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TL;DR: In this paper, it has been found that there is a distinct correlation between the 31============ 31======�P isotropic====== chemical shift value and the type of phosphate group.
Abstract: In studies of a series of crystals of layered metal phosphate compounds
by magic angle spinning (MAS) NMR spectroscopy, it has been found that
there is a distinct correlation between the
31
P isotropic
chemical shift value and the type of phosphate group. The isotropic
31
P chemical shifts of
(H
2
PO
4
)
-
,
(HPO
4
)
2-
and
(PO
4
)
3-
groups appear around δ
-10, -20 and -30, respectively. These assignments were
made unambiguously by measuring the 31
P MAS NMR spectra with
and without 1
H high-power decoupling together with the
cross-polarization transfer technique between 1
H and
31
P nuclei (CP MAS spectra).
71 citations