Principal Features of Tetrapropylammonium Hydroxide Removal Kinetics from Silicalite-1 in Quasi-isothermal Heating Regimes

Kód výsledku v IS VaVaI

RIV/61388955:_____/13:00391764 - isvavai.cz

Nalezeny alternativní kódy

RIV/60461373:22310/13:43895607

Výsledek na webu

http://dx.doi.org/10.1021/jp3090364

DOI - Digital Object Identifier

10.1021/jp3090364

Jazyk výsledku

angličtina

Název v původním jazyce

Principal Features of Tetrapropylammonium Hydroxide Removal Kinetics from Silicalite-1 in Quasi-isothermal Heating Regimes

Popis výsledku v původním jazyce

We study the time dependence of tetrapropylammonium hydroxide (TPAOH) removal from unconsolidated silicalite-1 crystal layers. The changes in the as-synthesized silicalite-1 crystals caused by TPAOH removal were investigated by thermogravimetric (TG) measurements using oxidative and nonoxidative gaseous agent. TG experiments were carried out under quasi-isothermal conditions that consisted of fast heating the sample to various temperatures T-max and keeping at those temperatures. The shape of the TG curves confirmed the key role of the mobilization reaction that controls the percolation of the mobile products of TPAOH through the zeolite channel system. Another key finding was the existence of clearly defined deviations between the TG curves for air and those for N-2. On the basis of these results, we proposed a simplified kinetic model that accounts for the principal features of quasi-isothermal TPAOH removal from silicalite-1. Our model approximates the TG arrangement with a continuo

Název v anglickém jazyce

Principal Features of Tetrapropylammonium Hydroxide Removal Kinetics from Silicalite-1 in Quasi-isothermal Heating Regimes

Popis výsledku anglicky

We study the time dependence of tetrapropylammonium hydroxide (TPAOH) removal from unconsolidated silicalite-1 crystal layers. The changes in the as-synthesized silicalite-1 crystals caused by TPAOH removal were investigated by thermogravimetric (TG) measurements using oxidative and nonoxidative gaseous agent. TG experiments were carried out under quasi-isothermal conditions that consisted of fast heating the sample to various temperatures T-max and keeping at those temperatures. The shape of the TG curves confirmed the key role of the mobilization reaction that controls the percolation of the mobile products of TPAOH through the zeolite channel system. Another key finding was the existence of clearly defined deviations between the TG curves for air and those for N-2. On the basis of these results, we proposed a simplified kinetic model that accounts for the principal features of quasi-isothermal TPAOH removal from silicalite-1. Our model approximates the TG arrangement with a continuo

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CF - Fyzikální chemie a teoretická chemie

OECD FORD obor

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Projekt

GAP204/11/1206: Použití PFG NMR, stochastické rekonstrukce a molekulární simulace pro stanovení transportně-strukturních vlastností pokročilých porézních materiálů

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2013

Kód důvěrnosti údajů

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

Název periodika

Journal of Physical Chemistry C

ISSN

1932-7447

e-ISSN

—

Svazek periodika

117

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

1468-1476

Kód UT WoS článku

000314205100031

EID výsledku v databázi Scopus

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