Study of the reductive solid-state ion exchange of indium into an NH4-beta zeolite

Mihályi, R.M.; Beyer, Hermann K.; Mavrodinova, V.; Minchev, Christo; Neinska, Ya.

doi:10.1016/s1387-1811(98)00156-5

Cited by 45 publications

(53 citation statements)

References 13 publications

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“…TPO and TPR results reported in earlier papers [5][6][7] provided evidence that InO + cations are formed by oxidation of In + in zeolite Y and beta at higher temperatures according to 2In+Z + 02 --~ 2InO+Z -…”

Section: Resultsmentioning

confidence: 85%

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Infrared-spectroscopic detection and distinction of indium cations of different oxidation states in zeolites

Mihályi

Beyer

Neinska

et al. 1999

React Kinet Catal Lett

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In+ cations introduced by reductive solid-state ion exchange into zeolites (Y, ZSM-5, mordenite) and cationic InO + species created by oxidation of the incorporated univalent cations were found to be detectable and distinguishable by IR spectroscopy using pyridine as probe molecule. Relatively weak interactions of In + lattice cations with pyridine give rise, after degassing at temperatures not higher than 370 K, to typical bands at 1446 and 1599 cm "~. After oxidation to InO +, these bands are shifted to 1452 and 1610 cm ~, being significantly more resistant towards degassing. Because of restrictions in the accessibility ofInO § to pyridine, the respective bands are absent in the spectra of mordenite.

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Section: Resultsmentioning

confidence: 85%

“…Further, it could be evidenced by IR spectroscopy and TPR/TPO techniques that In + cations, once incorporated by RSSIE into zeolites, can be oxidized with 02 to InO + and again restored by subsequent reduction [5][6][7]. These oxidation/reduction cycles proved to be fully reversible.…”

Section: Introductionmentioning

confidence: 99%

Infrared-spectroscopic detection and distinction of indium cations of different oxidation states in zeolites

Mihályi

Beyer

Neinska

et al. 1999

React Kinet Catal Lett

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“…3(a)], three characteristic absorption bands, corresponding to the C-C stretching vibrations of pyridine adsorbing on Brönsted acid sites, Brönsted + Lewis acid sites and Lewis acid sites, appear at 1545, 1490 and 1455 cm −1 , respectively. 17 The intensities of the 1545 and 1490 cm −1 bands become much weaker after HZSM-5 zeolite is modified. The intensity of the 1545 cm The small main channels (0.56 nm) of HZSM-5 zeolite, which are less than the supercage window (0.74 nm) of HY zeolite and the 12-membered ring openings (0.62 nm) of Hβ, are responsible mainly for this difference because a small amount of SnMe 4 can enter the channels to react with surface acid hydroxyls.…”

Section: Materials Nanoscience and Catalysismentioning

confidence: 98%

Study of the grafting reaction of SnMe₄ on the surface of ZSM‐5 zeolite

Zheng

Wang

et al. 2006

Applied Organom Chemis

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The grafting reaction of tetramethyltin on the surface of ZSM-5 zeolite (Si : Al = 55.0) was studied under vacuum conditions, and the chemical compositions, structure and properties of the resulting solid were characterized by in situ FTIR, ICP, XRD, XPS, UV-vis DRS, temperature programmed decomposition (TPD) and N 2 adsorption. The results show that the reaction occurs on the surface of ZSM-5 zeolite at 223 K without destroying the zeolite framework. The BET surface area and the pore volume of the zeolite decrease and the surface properties change; however, the microporous structure is retained during the reaction and post treatment.

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“…Ez utóbbi megfigyelésből levonható a következtetés, hogy az indium kation a további redukciónak inkább ellenáll, ha a zeolit ráccsal már kölcsönhatást létesített [53][54][55].…”

Section: Indium Tartalmú Zeolitok Előállítása Reduktív Szilárd Fázisúunclassified

“…A tiszta H-formán kapott spektrumot összehasonlítás céljából a 25. egyenlet) reagál a zeolit savas hidroxil csoportjaival [53]. Alternatív mechanizmus lehet, ha + kationokká, amelyekben az indium oxidációs állapota +3 [54,55]. Az itt javasolt mechanizmus szerint tehát mindhárom reakció, így az NO-SCR reakcióban aktív In-zeolit katalizátorok előállítására alkalmazott RSSIE is, azonos InOH köztiterméken és záró lépésen keresztül megy végbe.…”

Section: Coh-és Incoh-zsm5 Katalizátorok Tulajdonságai a Ch 4 /No-unclassified

Nitrogén-oxidok szelektív katalitikus redukciója metánnal indium tartalmú zeolitokon

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Study of the reductive solid-state ion exchange of indium into an NH4-beta zeolite

Cited by 45 publications

References 13 publications

Infrared-spectroscopic detection and distinction of indium cations of different oxidation states in zeolites

Infrared-spectroscopic detection and distinction of indium cations of different oxidation states in zeolites

Study of the grafting reaction of SnMe₄ on the surface of ZSM‐5 zeolite

Nitrogén-oxidok szelektív katalitikus redukciója metánnal indium tartalmú zeolitokon

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Study of the reductive solid-state ion exchange of indium into an NH4-beta zeolite

Cited by 45 publications

References 13 publications

Infrared-spectroscopic detection and distinction of indium cations of different oxidation states in zeolites

Infrared-spectroscopic detection and distinction of indium cations of different oxidation states in zeolites

Study of the grafting reaction of SnMe4 on the surface of ZSM‐5 zeolite

Nitrogén-oxidok szelektív katalitikus redukciója metánnal indium tartalmú zeolitokon

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Study of the grafting reaction of SnMe₄ on the surface of ZSM‐5 zeolite