On the Nature of Active Sites in Benzene Oxidation to Phenol with N2O over H-ZSM-5 with Low Fe Concentrations.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F02%3A54020093" target="_blank" >RIV/61388955:_____/02:54020093 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

On the Nature of Active Sites in Benzene Oxidation to Phenol with N2O over H-ZSM-5 with Low Fe Concentrations.

Popis výsledku v původním jazyce

Selective oxidation of benzene with N2O to phenol was investigated at 350 and 450 .DEG.C on H-ZSM-5 zeolites with different Si/Al composition, concentrations of iron ranging from 30 to 2000 ppm, and with gallium (2000 ppm). Zeolites dehydrated at 480 .DEG.C, dehydroxylated at 720 .DEG.C and steamed in the temperature range from 500 to 780 .DEG.C as well as those exchanged by NaCl and treated in NaOH solution were used. IR spectra of OH groups and of adsorbed d3-acetonitrile on zeolites were employed todetermine concentration of Broensted and Al-Lewis sites. ESR spectra of Fe(III) ions and IR spectra of perturbed framework T-O-T bonds due to the presence of Fe(II) ions in cationic sites of the reduced zeolites were applied to characterize location of Fe ions in zeolites. It has been shown that the rate of phenol formation correlates with the concentration of Fe in the zeolite, but is not affected by the presence of gallium.

Název v anglickém jazyce

On the Nature of Active Sites in Benzene Oxidation to Phenol with N2O over H-ZSM-5 with Low Fe Concentrations.

Popis výsledku anglicky

Selective oxidation of benzene with N2O to phenol was investigated at 350 and 450 .DEG.C on H-ZSM-5 zeolites with different Si/Al composition, concentrations of iron ranging from 30 to 2000 ppm, and with gallium (2000 ppm). Zeolites dehydrated at 480 .DEG.C, dehydroxylated at 720 .DEG.C and steamed in the temperature range from 500 to 780 .DEG.C as well as those exchanged by NaCl and treated in NaOH solution were used. IR spectra of OH groups and of adsorbed d3-acetonitrile on zeolites were employed todetermine concentration of Broensted and Al-Lewis sites. ESR spectra of Fe(III) ions and IR spectra of perturbed framework T-O-T bonds due to the presence of Fe(II) ions in cationic sites of the reduced zeolites were applied to characterize location of Fe ions in zeolites. It has been shown that the rate of phenol formation correlates with the concentration of Fe in the zeolite, but is not affected by the presence of gallium.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CF - Fyzikální chemie a teoretická chemie

OECD FORD obor

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Projekt

<a href="/cs/project/IAA4040007" target="_blank" >IAA4040007: Selektivní oxidace uhlovodíků katalyzované systémy Me-O/zeolit</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2002

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Catalysis

ISSN

0021-9517

e-ISSN

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Svazek periodika

211

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

109-118

Kód UT WoS článku

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EID výsledku v databázi Scopus

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