Over- and low-exchanged Co/BEA catalysts: General characterization and catalytic behaviour in ethane ammoxidation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F18%3A39912573" target="_blank" >RIV/00216275:25310/18:39912573 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.cattod.2017.08.027" target="_blank" >http://dx.doi.org/10.1016/j.cattod.2017.08.027</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cattod.2017.08.027" target="_blank" >10.1016/j.cattod.2017.08.027</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Over- and low-exchanged Co/BEA catalysts: General characterization and catalytic behaviour in ethane ammoxidation

Popis výsledku v původním jazyce

Ethane ammoxidation into acetonitrile was successfully catalyzed between 380 and 450 degrees C over Co/BEA solids issued from solid-state ion exchange with different metal loads. During the preparation, in the presence of NH4+-Beta zeolite (Si/Al = 12.5), CoCl2 precursor decomposes under helium stream without evaporation, leading to the stabilization of bare Co2+ at the exchange cationic sites as revealed by spectroscopic tools. However, at 4.13 and 5.63 wt.% of Co (Co/Al molar ratio equal to 0.75 and 1, respectively), the corresponding solids stabilized, besides bare beta-type Co2+ ions, Co oxo [Co(III)O](+) species, revealed by H-2-TPR. These species exhibit highest catalytic activity on the basis of TOF calculation and play a key role in ethane ammoxidation into acetonitrile at low temperature (380 degrees C). Nevertheless, the excess of cobalt is transformed into Co3O4 oxide (as revealed by XRD and TPR experiments) which catalyzes the hydrocarbons combustion into CO2.

Název v anglickém jazyce

Over- and low-exchanged Co/BEA catalysts: General characterization and catalytic behaviour in ethane ammoxidation

Popis výsledku anglicky

Ethane ammoxidation into acetonitrile was successfully catalyzed between 380 and 450 degrees C over Co/BEA solids issued from solid-state ion exchange with different metal loads. During the preparation, in the presence of NH4+-Beta zeolite (Si/Al = 12.5), CoCl2 precursor decomposes under helium stream without evaporation, leading to the stabilization of bare Co2+ at the exchange cationic sites as revealed by spectroscopic tools. However, at 4.13 and 5.63 wt.% of Co (Co/Al molar ratio equal to 0.75 and 1, respectively), the corresponding solids stabilized, besides bare beta-type Co2+ ions, Co oxo [Co(III)O](+) species, revealed by H-2-TPR. These species exhibit highest catalytic activity on the basis of TOF calculation and play a key role in ethane ammoxidation into acetonitrile at low temperature (380 degrees C). Nevertheless, the excess of cobalt is transformed into Co3O4 oxide (as revealed by XRD and TPR experiments) which catalyzes the hydrocarbons combustion into CO2.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

<a href="/cs/project/GBP106%2F12%2FG015" target="_blank" >GBP106/12/G015: Vývoj nových nanoporézních adsorbentů a katalyzátorů</a><br>

Návaznosti

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Catalysis Today

ISSN

0920-5861

e-ISSN

—

Svazek periodika

304

Číslo periodika v rámci svazku

April

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

9

Strana od-do

103-111

Kód UT WoS článku

000425179000014

EID výsledku v databázi Scopus

2-s2.0-85028382518