IR Operando Study of Ethanol Dehydration over MFI Zeolites: Structure-Activity Relationships

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F18%3A00506518" target="_blank" >RIV/61388955:_____/18:00506518 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/18:10386117

Výsledek na webu

<a href="http://hdl.handle.net/11104/0297751" target="_blank" >http://hdl.handle.net/11104/0297751</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpcc.8b05697" target="_blank" >10.1021/acs.jpcc.8b05697</a>

Jazyk výsledku

angličtina

Název v původním jazyce

IR Operando Study of Ethanol Dehydration over MFI Zeolites: Structure-Activity Relationships

Popis výsledku v původním jazyce

The effect of MFI zeolite morphology (2D-nanosheets vs conventional 3D structure) on ethanol dehydration was probed by FTIR operando spectroscopy. Simultaneous examination of turnover rates and Bronsted acid sites coverage under different reaction conditions allowed determining activation energies for monomolecular and bimolecular dehydration pathways, as well as thermodynamic parameters (Delta H-ads and Delta S-ads) for the adsorption of the most abundant surface species (i.e., ethanol monomers and dimers). The catalytic results showed smaller first-order activation energy (E-first) for 2D-MFI (E-first = 16 +/- 4 kJ mor(-1)) nanosheets vs 3D-MFI (E-first = 41 +/- 1 kJ mol(-1)) and similar zero-order activation energies (E-zero) for both 2D-(E-zero = 117 +/- 4 kJ mol(-1)) and 3D-MFI (E-zero = 124 +/- 1 kJ mol(-1)). Correlating the kinetic and thermodynamic parameters revealed that the different in stabilization of adsorbed ethanol monomers and dimers is the origin behind the differences in the intrinsic activities of 2D- and 3D-MFI zeolites which is refected in the corresponding zero-order activation entropies (Delta S-zero(double dagger)).

Název v anglickém jazyce

IR Operando Study of Ethanol Dehydration over MFI Zeolites: Structure-Activity Relationships

Popis výsledku anglicky

The effect of MFI zeolite morphology (2D-nanosheets vs conventional 3D structure) on ethanol dehydration was probed by FTIR operando spectroscopy. Simultaneous examination of turnover rates and Bronsted acid sites coverage under different reaction conditions allowed determining activation energies for monomolecular and bimolecular dehydration pathways, as well as thermodynamic parameters (Delta H-ads and Delta S-ads) for the adsorption of the most abundant surface species (i.e., ethanol monomers and dimers). The catalytic results showed smaller first-order activation energy (E-first) for 2D-MFI (E-first = 16 +/- 4 kJ mor(-1)) nanosheets vs 3D-MFI (E-first = 41 +/- 1 kJ mol(-1)) and similar zero-order activation energies (E-zero) for both 2D-(E-zero = 117 +/- 4 kJ mol(-1)) and 3D-MFI (E-zero = 124 +/- 1 kJ mol(-1)). Correlating the kinetic and thermodynamic parameters revealed that the different in stabilization of adsorbed ethanol monomers and dimers is the origin behind the differences in the intrinsic activities of 2D- and 3D-MFI zeolites which is refected in the corresponding zero-order activation entropies (Delta S-zero(double dagger)).

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

—

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

Journal of Physical Chemistry C

ISSN

1932-7447

e-ISSN

—

Svazek periodika

122

Číslo periodika v rámci svazku

42

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

24055-24067

Kód UT WoS článku

000448754300026

EID výsledku v databázi Scopus

2-s2.0-85054870284