High acidity unilamellar zeolite MCM-56 and its pillared and delaminated derivatives

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F14%3A00506969" target="_blank" >RIV/61388955:_____/14:00506969 - isvavai.cz</a>

Result on the web

<a href="http://hdl.handle.net/11104/0298091" target="_blank" >http://hdl.handle.net/11104/0298091</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/c4dt00130c" target="_blank" >10.1039/c4dt00130c</a>

Result language

angličtina

Original language name

High acidity unilamellar zeolite MCM-56 and its pillared and delaminated derivatives

Original language description

The unilamellar form of zeolite MWW, MCM-56, which is obtained by direct hydrothermal synthesis has been studied with regard to acidity and porosity in its original and post-synthesis modified pillared and delaminated forms. The acidity measured by FTIR was found to be only slightly lower than the highly active 3-D MWW forms, MCM-22 and MCM-49. Pivalonitrile adsorption, which is a measure of spatial openness, showed 50% accessibility vs. <30% for MCM-22/49. It highlights the potential of MCM-56 as a layered material with increased access to acid sites because it does not entail laborious post-synthesis modification. Swelling, pillaring and delamination of MCM-56 are facile but result in a reduction in the number of BrØnsted acid sites (BAS) while increasing accessibility to pivalonitrile. The delamination procedure involving sonication and acidification of the highly basic mother liquor produces the most visible increase in surface area and access to all BAS. The accompanying doubling of the solid yield and the decrease in absolute number of BAS suggest significant precipitation of dissolved silica generated during swelling and sonication in high pH medium. The viability of separating surfactant covered layers upon sonication with the consequence of exposing hydrophobic hydrocarbon tails to aqueous environment is addressed.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10403 - Physical chemistry

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2014

Confidentiality

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

Name of the periodical

Dalton Transactions

ISSN

1477-9226

e-ISSN

—

Volume of the periodical

43

Issue of the periodical within the volume

27

Country of publishing house

GB - UNITED KINGDOM

Number of pages

11

Pages from-to

10501-10511

UT code for WoS article

000338117200022

EID of the result in the Scopus database

2-s2.0-84902675122