Influence of the Co/Al ratio and the temperature of thermal treatment on cobalt speciation and catalytic properties of Co-ZSM-5 prepared by solid-state ion exchange
Identifieur interne : 000789 ( Main/Exploration ); précédent : 000788; suivant : 000790Influence of the Co/Al ratio and the temperature of thermal treatment on cobalt speciation and catalytic properties of Co-ZSM-5 prepared by solid-state ion exchange
Auteurs : Mourad Mhamdi [Tunisie] ; Sihem Khaddar-Zine [Tunisie] ; Abdelhamid Ghorbel [Tunisie]Source :
- Applied catalysis. A, General [ 0926-860X ] ; 2008.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Cobalt.
English descriptors
- KwdEn :
Abstract
Physico-chemical and catalytic properties of cobalt-containing ZSM-5 zeolite prepared by solid-state ion exchange were compared as a function of both the Co/Al molar ratio and the temperature of thermal treatment. The catalysts were characterized by chemical analysis, XRD, N2 BET, TEM/EDX, H2 TPR, FTIR, XANES, EXAFS and TPD of NH3. The preparation procedure results in the disappearance ofBrØnsted acid sites and the creation of new Lewis acid sites, as suggested by TPD of NH3 and FTIR of pyridine adsorption. TEM/EDX shows that for a Co/Al ratio of 1/2, cobalt is present as exchanged ions in the zeolite and as oxide particles on the support; whilst for a Co/Al ratio of 1 or 3/2, a cobalt phyllosilicate phase is present at the outer surface of the zeolite. Catalyst prepared with the Co/Al ratio of 1 at 500 °C exhibits high activity and selectivity toward acetonitrile in the ammoxidation of ethane and ethylene.
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A, General</title><title level="j" type="abbreviated">Appl. catal., A Gen.</title><idno type="ISSN">0926-860X</idno><imprint><date when="2008">2008</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Applied catalysis. A, General</title><title level="j" type="abbreviated">Appl. catal., A Gen.</title><idno type="ISSN">0926-860X</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Ammoxidation</term><term>Catalytic reaction</term><term>Cobalt</term><term>EXAFS spectrometry</term><term>Heat treatment</term><term>Heterogeneous catalysis</term><term>Ion exchange</term><term>Molecular sieve</term><term>Solid state</term><term>Solid state reaction</term><term>XANES spectrometry</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Traitement thermique</term><term>Cobalt</term><term>Réaction catalytique</term><term>Tamis moléculaire</term><term>Etat solide</term><term>Echange ion</term><term>Réaction état solide</term><term>Spectrométrie EXAFS</term><term>Spectrométrie XANES</term><term>Ammonioxydation</term><term>Catalyse hétérogène</term><term>Zéolite ZSM5</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Cobalt</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Physico-chemical and catalytic properties of cobalt-containing ZSM-5 zeolite prepared by solid-state ion exchange were compared as a function of both the Co/Al molar ratio and the temperature of thermal treatment. The catalysts were characterized by chemical analysis, XRD, N<sub>2</sub> BET, TEM/EDX, H<sub>2</sub> TPR, FTIR, XANES, EXAFS and TPD of NH<sub>3</sub>. The preparation procedure results in the disappearance ofBrØnsted acid sites and the creation of new Lewis acid sites, as suggested by TPD of NH<sub>3</sub> and FTIR of pyridine adsorption. TEM/EDX shows that for a Co/Al ratio of 1/2, cobalt is present as exchanged ions in the zeolite and as oxide particles on the support; whilst for a Co/Al ratio of 1 or 3/2, a cobalt phyllosilicate phase is present at the outer surface of the zeolite. Catalyst prepared with the Co/Al ratio of 1 at 500 °C exhibits high activity and selectivity toward acetonitrile in the ammoxidation of ethane and ethylene.</div></front></TEI><affiliations><list><country><li>Tunisie</li></country><region><li>Gouvernorat de Tunis</li></region><settlement><li>Tunis</li></settlement></list><tree><country name="Tunisie"><region name="Gouvernorat de Tunis"><name sortKey="Mhamdi, Mourad" sort="Mhamdi, Mourad" uniqKey="Mhamdi M" first="Mourad" last="Mhamdi">Mourad Mhamdi</name></region><name sortKey="Ghorbel, Abdelhamid" sort="Ghorbel, Abdelhamid" uniqKey="Ghorbel A" first="Abdelhamid" last="Ghorbel">Abdelhamid Ghorbel</name><name sortKey="Khaddar Zine, Sihem" sort="Khaddar Zine, Sihem" uniqKey="Khaddar Zine S" first="Sihem" last="Khaddar-Zine">Sihem Khaddar-Zine</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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