Direct incorporation of B, Al, and Ga into medium-pore ITH zeolite: Synthesis, acidic, and catalytic properties

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F16%3A00462056" target="_blank" >RIV/61388955:_____/16:00462056 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.cattod.2015.10.013" target="_blank" >http://dx.doi.org/10.1016/j.cattod.2015.10.013</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cattod.2015.10.013" target="_blank" >10.1016/j.cattod.2015.10.013</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Direct incorporation of B, Al, and Ga into medium-pore ITH zeolite: Synthesis, acidic, and catalytic properties

Popis výsledku v původním jazyce

Direct crystallization of B-, Al- and Ga-substituted medium-pore ITH zeolites was carried out using hexamethonium hydroxide (HMH) and N,N,N,N,-tetramethyl-1,6-hexanediamine (TMHDA) as structure-directing agents. The type of organic SDA was found determining the crystal size and the nature of Brønsted acid sites in isomorphously substituted ITH zeolites. The use of HMH resulted in formation of tiny (length of 0.5–3 μm) needle-like ITH crystals having bridging 6-point triple bond; length half of m-dashSisingle bond(OH+)single bondE()6-point triple bond; length half of m-dash (E = B, Al, Ga) groups with acidic strength increasing in the following sequence B < Ga < Al. In contrast, ITH zeolites with bulky (length of 40–50 μm) crystals prepared using TMHDA possess loosely bond framework and [(SiO)3Alsingle bondOH]H+ and (SiO)2Bsingle bondOH groups (absorption band at 3670 cm1) perturbing upon interaction with pyridine. B-, Al- and Ga-ITH possessing tiny crystals showed improved catalytic performance in tetrahydropyranylation of 1-hexanol in comparison with non-acidic heteroelement-free germanosilicate zeolites and isomorphously substituted ITH zeolites with bulky crystals. The yield of target ether is enhanced with increasing strength of acid sites (e.g. B- < Ga- < Al-ITH) or with growth in their concentration.n

Název v anglickém jazyce

Direct incorporation of B, Al, and Ga into medium-pore ITH zeolite: Synthesis, acidic, and catalytic properties

Popis výsledku anglicky

Direct crystallization of B-, Al- and Ga-substituted medium-pore ITH zeolites was carried out using hexamethonium hydroxide (HMH) and N,N,N,N,-tetramethyl-1,6-hexanediamine (TMHDA) as structure-directing agents. The type of organic SDA was found determining the crystal size and the nature of Brønsted acid sites in isomorphously substituted ITH zeolites. The use of HMH resulted in formation of tiny (length of 0.5–3 μm) needle-like ITH crystals having bridging 6-point triple bond; length half of m-dashSisingle bond(OH+)single bondE()6-point triple bond; length half of m-dash (E = B, Al, Ga) groups with acidic strength increasing in the following sequence B < Ga < Al. In contrast, ITH zeolites with bulky (length of 40–50 μm) crystals prepared using TMHDA possess loosely bond framework and [(SiO)3Alsingle bondOH]H+ and (SiO)2Bsingle bondOH groups (absorption band at 3670 cm1) perturbing upon interaction with pyridine. B-, Al- and Ga-ITH possessing tiny crystals showed improved catalytic performance in tetrahydropyranylation of 1-hexanol in comparison with non-acidic heteroelement-free germanosilicate zeolites and isomorphously substituted ITH zeolites with bulky crystals. The yield of target ether is enhanced with increasing strength of acid sites (e.g. B- < Ga- < Al-ITH) or with growth in their concentration.n

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

Catalysis Today

ISSN

0920-5861

e-ISSN

—

Svazek periodika

277

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

11

Strana od-do

37-47

Kód UT WoS článku

000385594800006

EID výsledku v databázi Scopus

2-s2.0-84953206623