Tailoring the Structure and Acid Site Accessibility of Mordenite Zeolite for Hydroisomerisation of n-hexane

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F18%3A39912797" target="_blank" >RIV/00216275:25310/18:39912797 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61388955:_____/18:00490608

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.apcata.2018.05.035" target="_blank" >http://dx.doi.org/10.1016/j.apcata.2018.05.035</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.apcata.2018.05.035" target="_blank" >10.1016/j.apcata.2018.05.035</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Tailoring the Structure and Acid Site Accessibility of Mordenite Zeolite for Hydroisomerisation of n-hexane

Popis výsledku v původním jazyce

Mordenite zeolites with diffusion-restricted access to the acid sites located in mono-dimensional 12-ring channels and 8-ring side pockets have found broad applications as catalysts for hydroisomerisation of linear C-5 and C-6 alkanes and other highly relevant acid-catalysed processes. The accessibility of the porous structure of mordenite (MOR) zeolite is traditionally enhanced by dealumination, but this is invariably connected with a dramatic reduction in the aluminium content and corresponding concentration of the acid sites in the zeolites. Here we describe the preparation of MOR zeolite with high micropore volume, three-dimensional supermicropores (d similar to 7.5 angstrom) and good acid site accessibility by concurrent extraction of Si and Al using postsynthesis fluorination alkaline-acid treatment. The concurrent extraction of Si and Al enables formation of more developed super-microporous structure and preservation of the molecular Si/Al. The procedure yields MOR with a crystalline structure in which the Si/Al ratio and the micropore volume can be tailored (Si/Al from similar to 6, V-MI up to 0.25 cm(3).g(-1)) by the chemical conditions of the treatment. The Al-rich 3D supermicroporous structure with accessible Bronsted and Lewis active sites provides strongly enhanced activity, selectivity and long-term catalytic stability in the transformation of n-hexane into the corresponding branched isomers.

Název v anglickém jazyce

Tailoring the Structure and Acid Site Accessibility of Mordenite Zeolite for Hydroisomerisation of n-hexane

Popis výsledku anglicky

Mordenite zeolites with diffusion-restricted access to the acid sites located in mono-dimensional 12-ring channels and 8-ring side pockets have found broad applications as catalysts for hydroisomerisation of linear C-5 and C-6 alkanes and other highly relevant acid-catalysed processes. The accessibility of the porous structure of mordenite (MOR) zeolite is traditionally enhanced by dealumination, but this is invariably connected with a dramatic reduction in the aluminium content and corresponding concentration of the acid sites in the zeolites. Here we describe the preparation of MOR zeolite with high micropore volume, three-dimensional supermicropores (d similar to 7.5 angstrom) and good acid site accessibility by concurrent extraction of Si and Al using postsynthesis fluorination alkaline-acid treatment. The concurrent extraction of Si and Al enables formation of more developed super-microporous structure and preservation of the molecular Si/Al. The procedure yields MOR with a crystalline structure in which the Si/Al ratio and the micropore volume can be tailored (Si/Al from similar to 6, V-MI up to 0.25 cm(3).g(-1)) by the chemical conditions of the treatment. The Al-rich 3D supermicroporous structure with accessible Bronsted and Lewis active sites provides strongly enhanced activity, selectivity and long-term catalytic stability in the transformation of n-hexane into the corresponding branched isomers.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Applied catalysis A: General

ISSN

0926-860X

e-ISSN

—

Svazek periodika

562

Číslo periodika v rámci svazku

July

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

14

Strana od-do

159-172

Kód UT WoS článku

000443630600018

EID výsledku v databázi Scopus

2-s2.0-85048269246