Consecutive interlayer disassembly-reassembly during alumination of UOV zeolites: insight into the mechanism

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F17%3A00487473" target="_blank" >RIV/61388955:_____/17:00487473 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/17:10368189

Výsledek na webu

<a href="http://dx.doi.org/10.1039/c7ta05935c" target="_blank" >http://dx.doi.org/10.1039/c7ta05935c</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/c7ta05935c" target="_blank" >10.1039/c7ta05935c</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Consecutive interlayer disassembly-reassembly during alumination of UOV zeolites: insight into the mechanism

Popis výsledku v původním jazyce

Investigation of the kinetics of UOV germanosilicate alumination by X-ray diffraction, Al-27 and Si-29 MAS NMR, ICP/OES and FTIR spectroscopy showed the multi-stage mechanism of the process. The first step consists of degermanation and partial disassembly followed by Al incorporation into the UOV germanosilicate framework in the second step. The Al atoms stabilize the UOV framework by healing the defects formed after rapid hydrolysis of Ge-O-Si bonds, which was evidenced by comparison with the reference treatment of initial UOV samples with HNO3 (pH = 2). Post-synthesis alumination of UOV leads to the generation of strong Bronsted and Lewis acid sites. Their ratio in aluminated UOV derivatives can be adjusted by the variation of treatment conditions. The intrinsic properties of parent UOV germanosilicates determine the textural properties of aluminated derivatives.

Název v anglickém jazyce

Consecutive interlayer disassembly-reassembly during alumination of UOV zeolites: insight into the mechanism

Popis výsledku anglicky

Investigation of the kinetics of UOV germanosilicate alumination by X-ray diffraction, Al-27 and Si-29 MAS NMR, ICP/OES and FTIR spectroscopy showed the multi-stage mechanism of the process. The first step consists of degermanation and partial disassembly followed by Al incorporation into the UOV germanosilicate framework in the second step. The Al atoms stabilize the UOV framework by healing the defects formed after rapid hydrolysis of Ge-O-Si bonds, which was evidenced by comparison with the reference treatment of initial UOV samples with HNO3 (pH = 2). Post-synthesis alumination of UOV leads to the generation of strong Bronsted and Lewis acid sites. Their ratio in aluminated UOV derivatives can be adjusted by the variation of treatment conditions. The intrinsic properties of parent UOV germanosilicates determine the textural properties of aluminated derivatives.

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

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Journal of materials chemistry A

ISSN

2050-7488

e-ISSN

—

Svazek periodika

5

Číslo periodika v rámci svazku

43

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

12

Strana od-do

22576-22587

Kód UT WoS článku

000414605900018

EID výsledku v databázi Scopus

2-s2.0-85033225085