Location of Framework Al Atoms in the Channels of ZSM-5: Effect of the (Hydrothermal) Synthesis

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F16%3A00458272" target="_blank" >RIV/61388955:_____/16:00458272 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1002/chem.201503758" target="_blank" >http://dx.doi.org/10.1002/chem.201503758</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/chem.201503758" target="_blank" >10.1002/chem.201503758</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Location of Framework Al Atoms in the Channels of ZSM-5: Effect of the (Hydrothermal) Synthesis

Popis výsledku v původním jazyce

27Al 3Q MAS NMR and UV/Vis spectroscopy with bare CoII ions as probes of Al pairs in the zeolite framework were employed to analyze the location of framework Al atoms in the channel system of zeolite ZSM-5. Furthermore, the effect of Na+ ions together with tetrapropylammonium cation (TPA+) in the ZSM-5 synthesis gel on the location of Al in the channel system was investigated. Zeolites prepared using exclusively TPA+ as a structure-directing agent (i.e., in the absence of Na+ ions) led to 55–90 % of Al atoms located at the channel intersection, regardless the presence or absence of Al pairs [AlO(SiO)2Al sequences in one ring] in the zeolite framework. The presence of Na+ ions in the synthesis gel did not modify the Al location at the channel intersection (55–95 % of Al atoms) and led only to changes in i) the distribution of framework Al atoms between Al pairs (decrease) and single isolated Al atoms (increase), and ii) the siting of Al in distinguishable framework tetrahedral sites.

Název v anglickém jazyce

Location of Framework Al Atoms in the Channels of ZSM-5: Effect of the (Hydrothermal) Synthesis

Popis výsledku anglicky

27Al 3Q MAS NMR and UV/Vis spectroscopy with bare CoII ions as probes of Al pairs in the zeolite framework were employed to analyze the location of framework Al atoms in the channel system of zeolite ZSM-5. Furthermore, the effect of Na+ ions together with tetrapropylammonium cation (TPA+) in the ZSM-5 synthesis gel on the location of Al in the channel system was investigated. Zeolites prepared using exclusively TPA+ as a structure-directing agent (i.e., in the absence of Na+ ions) led to 55–90 % of Al atoms located at the channel intersection, regardless the presence or absence of Al pairs [AlO(SiO)2Al sequences in one ring] in the zeolite framework. The presence of Na+ ions in the synthesis gel did not modify the Al location at the channel intersection (55–95 % of Al atoms) and led only to changes in i) the distribution of framework Al atoms between Al pairs (decrease) and single isolated Al atoms (increase), and ii) the siting of Al in distinguishable framework tetrahedral sites.

Druh

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

CEP obor

CF - Fyzikální chemie a teoretická chemie

OECD FORD obor

—

Projekt

<a href="/cs/project/GA15-13876S" target="_blank" >GA15-13876S: Zeolity se (semi)monomodální distribucí hliníku ve skeletu</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Chemistry A European Journal

ISSN

1521-3765

e-ISSN

—

Svazek periodika

22

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

5

Strana od-do

3937-3941

Kód UT WoS článku

000372526500004

EID výsledku v databázi Scopus

2-s2.0-84960152991