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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

CF - Physical chemistry and theoretical chemistry

OECD FORD branch

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Project

<a href="/en/project/GP14-30898P" target="_blank" >GP14-30898P: Understanding of catalytic activity of novel isomorphously substituted microporous germanosilicates</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

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

Name of the periodical

Catalysis Today

ISSN

0920-5861

e-ISSN

—

Volume of the periodical

277

Issue of the periodical within the volume

1

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

11

Pages from-to

37-47

UT code for WoS article

000385594800006

EID of the result in the Scopus database

2-s2.0-84953206623