Tuning of textural properties of germanosilicate zeolites ITH and IWW by acidic leaching

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F16%3A00462054" target="_blank" >RIV/61388955:_____/16:00462054 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.jechem.2015.12.003" target="_blank" >http://dx.doi.org/10.1016/j.jechem.2015.12.003</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jechem.2015.12.003" target="_blank" >10.1016/j.jechem.2015.12.003</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Tuning of textural properties of germanosilicate zeolites ITH and IWW by acidic leaching

Popis výsledku v původním jazyce

The possibility to adjust textural properties of ITH and IWW zeolites by the variation of conditions (e.g. temperature, pH, duration) of acidic leaching was shown. While the growth of the temperature of acid treatment caused the increasing amount of leached Ge atoms and enhancing volumes of both micro and mesopores at 80 °C, the mesopore volume in ITH (Si/Ge = 3.4 and 5.8) and IWW (Si/Ge = 3.3) zeolites changed with the duration of the treatment (pH = 2; T = 80 °C) as follows: 96 h < 1 h < 24 h. Independently on the chemical composition and zeolite topology, the treatment of germanosilicate zeolites at pH = 2-7 resulted in development of both micro and mesoporosity accompanied by the extraction of substantial amount of Ge atoms, while the increasing acidity up to pH = 0 resulted in some reduction of Ge extraction and in the development of mesopores at maintained value of micropore volume when compared with initial germanosilicates. The higher activity (i.e. number of reactant molecules converted per active site) of germanosilicate with modified micro-mesoporous channel system in comparison with parent IWW zeolite in esterification of levulinic acid was attributed to enhanced accessibility of active sites.

Název v anglickém jazyce

Tuning of textural properties of germanosilicate zeolites ITH and IWW by acidic leaching

Popis výsledku anglicky

The possibility to adjust textural properties of ITH and IWW zeolites by the variation of conditions (e.g. temperature, pH, duration) of acidic leaching was shown. While the growth of the temperature of acid treatment caused the increasing amount of leached Ge atoms and enhancing volumes of both micro and mesopores at 80 °C, the mesopore volume in ITH (Si/Ge = 3.4 and 5.8) and IWW (Si/Ge = 3.3) zeolites changed with the duration of the treatment (pH = 2; T = 80 °C) as follows: 96 h < 1 h < 24 h. Independently on the chemical composition and zeolite topology, the treatment of germanosilicate zeolites at pH = 2-7 resulted in development of both micro and mesoporosity accompanied by the extraction of substantial amount of Ge atoms, while the increasing acidity up to pH = 0 resulted in some reduction of Ge extraction and in the development of mesopores at maintained value of micropore volume when compared with initial germanosilicates. The higher activity (i.e. number of reactant molecules converted per active site) of germanosilicate with modified micro-mesoporous channel system in comparison with parent IWW zeolite in esterification of levulinic acid was attributed to enhanced accessibility of active 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/GP14-30898P" target="_blank" >GP14-30898P: Výzkum katalytické aktivity nových isomorfně substituovaných mikroporézních germanosilikátů</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

Journal of Energy Chemistry

ISSN

2095-4956

e-ISSN

—

Svazek periodika

25

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

CN - Čínská lidová republika

Počet stran výsledku

9

Strana od-do

318

Kód UT WoS článku

000375334900021

EID výsledku v databázi Scopus

2-s2.0-84962479905