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Titolo:
Electron spin resonance and electron spin echo modulation studies on the formation and adsorbate interactions of Ni(I) in synthetic clinoptilolite
Autore:
Choo, H; Prakash, AM; Park, SK; Kevan, L;
Indirizzi:
Univ Houston, Dept Chem, Houston, TX 77204 USA Univ Houston Houston TX USA 77204 uston, Dept Chem, Houston, TX 77204 USA
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 30, volume: 103, anno: 1999,
pagine: 6193 - 6199
SICI:
1520-6106(19990729)103:30<6193:ESRAES>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
SILICOALUMINOPHOSPHATE TYPE-5; PARAMAGNETIC-RESONANCE; ETHYLENE DIMERIZATION; Y-ZEOLITES; IONS; REDUCTION; LOCATION; SPECTROSCOPIES; REDUCIBILITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Kevan, L Univ Houston, Dept Chem, Univ Pk, Houston, TX 77204 USA Univ Houston Univ Pk Houston TX USA 77204 , Houston, TX 77204 USA
Citazione:
H. Choo et al., "Electron spin resonance and electron spin echo modulation studies on the formation and adsorbate interactions of Ni(I) in synthetic clinoptilolite", J PHYS CH B, 103(30), 1999, pp. 6193-6199

Abstract

Electron spin resonance (ESR) and electron spin echo modulation (ESEM) spectroscopies were used to study the formation of Ni(I) by various reduction methods and various adsorbate interactions of Ni(I) in synthetic clinoptilolite, in which Ni(II) was ion-exchanged into extraframework sites of clinoptilolite. Thermal reduction by dehydration at 573 K shows a single species assigned to Ni(I) ions. Two isolated Ni(I) ions are observed after hydrogenreduction at 623 K. Adsorption of methanol on hydrogen-reduced NiNaK-Clinoforms a Ni(I)-(CD3OH)(n) complex resulting from the interaction of methanol with one of the isolated Ni(I) ions. Adsorption of ammonia on hydrogen-reduced NiNaK-Clino produces a prominent Ni(I)-(ND3)(n) complex by interaction with both Ni(I) ions. The C-13 hyperfine structure and ESEM analysis parameters after (CO)-C-13 adsorption indicate that Ni(I) interacts with one COmolecule and forms a NI(I)-(CO)(1) complex. Two Ni(I)-(C2D4)(n) complexes are generated after adsorption of ethylene on dehydrated Ni(II)NaK-Clino and subsequent heating below 623 K. At higher temperature, these species disappear with the concomitant formation of two Ni(I)-(C4D8)(n) complexes, indicating ethylene dimerization. D-2 ESEM confirms the coordination of Ni(I) with butene. Adsorption of NO on dehydrated Ni(II)NaK-Clino produces two Ni(I)-NO+ complexes formed by transfer of the odd electron from NO to Ni(II) ions. Along with two Ni(I)-NO+ species, another species assigned to the NO radical is also observed in NiNaK-Clino after NO adsorption on Ni(II)NaK-Clino and NaK-Clino.

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Documento generato il 26/09/20 alle ore 01:56:37