Login for students

Login for employees

Publication detail

Over- and low-exchanged Co/BEA catalysts: General characterization and catalytic behaviour in ethane ammoxidation
Authors: Essid Safaa | Ayari Faouzi | Bulánek Roman | Vaculík Jan | Mhamdi Mourad | Delahay Gerard | Ghorbel Abdelhamid
Year: 2018
Type of publication: článek v odborném periodiku
Name of source: Catalysis Today
Publisher name: Elsevier Science BV
Place: Amsterdam
Page from-to: 103-111
Titles:
Language Name Abstract Keywords
cze Iontově vyměněné Co/BEA katalyzátory: Základní charakterizace a katalytické chování v ammoxidaci etanu Ammoxidace etanu na acetonitril byla úspěšně katalyzována při teplotách 380 až 450 °C pomocí iontově vyměněných pevných Co/BEA katalyzátorů s odlišným obsahem kovu. Katalyticky aktivní kationtové polohy byly identifikovány spektroskopickými metodami a pomocí CO-TPR. Amoxidace; kationtový výměna v pevné fázi; CO-TPR; oxidy kobaltu
eng Over- and low-exchanged Co/BEA catalysts: General characterization and catalytic behaviour in ethane ammoxidation 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. Ammoxidation; Solid-state exchange; CO-TPR; Cobalt oxide

Departments

Other Parts

Map

en.mapy.cz

Services

Popular Links

© 2023 University of Pardubice, Studentská 95, 532 10 Pardubice 2
Phone: +420 466 036 111, 466 036 112, 466 036 113
Webmaster, RSS
Data box ID: f5vj9hu
Accessibility Statement
CC BY-NC-ND 4.0Creative CommonsAttributionNonCommercialNoDerivatives