In situ synchrotron X-ray diffraction reveals the disassembly-organisation mechanism of germanosilicate zeolites in HCl vapour

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F22%3A10453425" target="_blank" >RIV/00216208:11310/22:10453425 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=yHc1kLMTrm" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=yHc1kLMTrm</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/d2qi00211f" target="_blank" >10.1039/d2qi00211f</a>

Jazyk výsledku

angličtina

Název v původním jazyce

In situ synchrotron X-ray diffraction reveals the disassembly-organisation mechanism of germanosilicate zeolites in HCl vapour

Popis výsledku v původním jazyce

The assembly-disassembly-organisation-reassembly (ADOR) approach extends the synthesis of new zeolites. Understanding the disassembly and organisation mechanism is important to optimise the post-treatment process on germanosilicate zeolites. In situ synchrotron X-ray diffraction technique was applied to study the mechanism of these two steps in HCl vapour, which it is often unfeasible to capture using conventional ex situ characterisation. Three germanosilicate zeolites with different pore systems, i.e.UTL, UOV and IWR, were selected as models to compare the reaction behaviours. Three key steps, including fast hydrolysis of d4r units (ca. 1 min), further disassembly (ca. 3-5 min), and self-organisation after disassembly (ca. 2-3 min), were observed in the HCl acid vapour. An unusual lattice expansion of the intralayer was observed at the very beginning of the hydrolysis process in IWR, while the UTL and UOV showed continuous shrinkage. Owing to the diffusion differences related to the structural features, extra-large-pore UTL zeolite showed faster kinetics than the other two large-pore zeolites, although UTL zeolite has much larger crystals. These findings potentially guide further modification of the treatment parameters in the ADOR process to prepare new zeolites.

Název v anglickém jazyce

In situ synchrotron X-ray diffraction reveals the disassembly-organisation mechanism of germanosilicate zeolites in HCl vapour

Popis výsledku anglicky

The assembly-disassembly-organisation-reassembly (ADOR) approach extends the synthesis of new zeolites. Understanding the disassembly and organisation mechanism is important to optimise the post-treatment process on germanosilicate zeolites. In situ synchrotron X-ray diffraction technique was applied to study the mechanism of these two steps in HCl vapour, which it is often unfeasible to capture using conventional ex situ characterisation. Three germanosilicate zeolites with different pore systems, i.e.UTL, UOV and IWR, were selected as models to compare the reaction behaviours. Three key steps, including fast hydrolysis of d4r units (ca. 1 min), further disassembly (ca. 3-5 min), and self-organisation after disassembly (ca. 2-3 min), were observed in the HCl acid vapour. An unusual lattice expansion of the intralayer was observed at the very beginning of the hydrolysis process in IWR, while the UTL and UOV showed continuous shrinkage. Owing to the diffusion differences related to the structural features, extra-large-pore UTL zeolite showed faster kinetics than the other two large-pore zeolites, although UTL zeolite has much larger crystals. These findings potentially guide further modification of the treatment parameters in the ADOR process to prepare new zeolites.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

<a href="/cs/project/GA20-12099S" target="_blank" >GA20-12099S: Pokročilá charakterizace aktivních center v nových zeolitových katalyzátorech</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Inorganic Chemistry Frontiers [online]

ISSN

2052-1553

e-ISSN

2052-1553

Svazek periodika

9

Číslo periodika v rámci svazku

14

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

8

Strana od-do

3453-3460

Kód UT WoS článku

000804228900001

EID výsledku v databázi Scopus

2-s2.0-85131763346