Conversion of ethanol to acetaldehyde over VOX-SiO2 catalysts: the effects of support texture and vanadium speciation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F17%3A39902743" target="_blank" >RIV/00216275:25310/17:39902743 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22320/17:43913292

Výsledek na webu

<a href="http://dx.doi.org/10.1007/s11144-017-1169-z" target="_blank" >http://dx.doi.org/10.1007/s11144-017-1169-z</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11144-017-1169-z" target="_blank" >10.1007/s11144-017-1169-z</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Conversion of ethanol to acetaldehyde over VOX-SiO2 catalysts: the effects of support texture and vanadium speciation

Popis výsledku v původním jazyce

SBA-15 and fumed-silica-supported vanadium catalysts prepared by impregnation to contain 1, 5 and 10 wt% of vanadia were characterized by XRF, N-2-BET, SEM, H-2-TPR, DR UV-vis and Raman spectroscopy to determine the key vanadium species present in these catalysts. These catalysts were then used in the oxidation of ethanol by oxygen at 250 and 300 degrees C. The comparison of the catalytic performances of individual catalysts with their physico-chemical characteristics led to the conclusion that oligomeric tetrahedrally coordinated vanadium species have the highest potential for the selective oxidation of ethanol reaching high intrinsic catalytic activity and high selectivity to acetaldehyde. They differ significantly from catalysts with a high population of monomeric species, which exhibit low activity, especially at 250 degrees C, and high selectivity to ethylene as a product of ethanol dehydration. The observed changes in the isothermal dependence of selectivity to ethene on the conversion degree were ascribed to the auto-inhibition effect of water vapor.

Název v anglickém jazyce

Conversion of ethanol to acetaldehyde over VOX-SiO2 catalysts: the effects of support texture and vanadium speciation

Popis výsledku anglicky

SBA-15 and fumed-silica-supported vanadium catalysts prepared by impregnation to contain 1, 5 and 10 wt% of vanadia were characterized by XRF, N-2-BET, SEM, H-2-TPR, DR UV-vis and Raman spectroscopy to determine the key vanadium species present in these catalysts. These catalysts were then used in the oxidation of ethanol by oxygen at 250 and 300 degrees C. The comparison of the catalytic performances of individual catalysts with their physico-chemical characteristics led to the conclusion that oligomeric tetrahedrally coordinated vanadium species have the highest potential for the selective oxidation of ethanol reaching high intrinsic catalytic activity and high selectivity to acetaldehyde. They differ significantly from catalysts with a high population of monomeric species, which exhibit low activity, especially at 250 degrees C, and high selectivity to ethylene as a product of ethanol dehydration. The observed changes in the isothermal dependence of selectivity to ethene on the conversion degree were ascribed to the auto-inhibition effect of water vapor.

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

Reaction Kinetics Mechanisms and Catalysis

ISSN

1878-5190

e-ISSN

—

Svazek periodika

121

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

17

Strana od-do

353-369

Kód UT WoS článku

000401935400025

EID výsledku v databázi Scopus

2-s2.0-85014230575