Oxidative transformation of methane over nickel catalysts supported on rare-earth metal oxides
Identifieur interne : 000351 ( France/Analysis ); précédent : 000350; suivant : 000352Oxidative transformation of methane over nickel catalysts supported on rare-earth metal oxides
Auteurs : A. Djaidja [Algérie] ; A. Barama [Algérie] ; M. M Bettahar [France]Source :
- Catalysis Today [ 0920-5861 ] ; 2000.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Hydrocarbure, Nickel.
English descriptors
- KwdEn :
Abstract
The oxidative transformation of methane over Ni catalysts supported on La, Sm and Ce oxides was investigated at atmospheric pressure, T=723–923K and CH4/O2=1–10. The BET surface areas were low (3–22m2g−1) and decreased strongly after reaction (down to 0.5m2g−1). Carbonate species, Ni2O3 and supported oxides were identified by XRD or IR spectroscopy studies in both the fresh and used catalysts. The Ni° phase was also probably formed as amorphous phase. The oxidative coupling of methane route passed through a minimum as a function of the Ni percentage and was favored by the Ce or Sm oxide support, Li additive and low reaction temperature. High selectivities (60–90%) and good yields (about 15%) in C2 hydrocarbons with low carbon balance (0–10%) were obtained at 823K. La supported oxide, Ba additive and high reaction temperature favored the partial oxidation of methane. The obtained results were discussed in the light of the reducibility and acid–base properties of the catalysts.
Url:
DOI: 10.1016/S0920-5861(00)00389-8
Affiliations:
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M Bettahar</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire de Catalyse Hétérogène, UMR-CNRS 7565, Université Henri Poincaré-Nancy I, Boulevard des Aiguillettes, BP 239, 54506 Vandoeuvre-les-Nancy Cedex</wicri:regionArea><placeName><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Lorraine (région)</region><settlement type="city">Vandoeuvre-les-Nancy</settlement></placeName></affiliation><affiliation></affiliation><affiliation wicri:level="1"><country wicri:rule="url">France</country></affiliation></author></analytic><monogr></monogr><series><title level="j">Catalysis Today</title><title level="j" type="abbrev">CATTOD</title><idno type="ISSN">0920-5861</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="2000">2000</date><biblScope unit="volume">61</biblScope><biblScope unit="issue">1–4</biblScope><biblScope unit="page" from="303">303</biblScope><biblScope unit="page" to="307">307</biblScope></imprint><idno type="ISSN">0920-5861</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0920-5861</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Catalyst activity</term><term>Catalytic reaction</term><term>Experimental study</term><term>Heterogeneous catalysis</term><term>Hydrocarbon</term><term>Lanthanum oxide</term><term>Methane</term><term>Ni</term><term>Nickel</term><term>Oxidation</term><term>Oxidative coupling</term><term>Partial oxidation</term><term>Preparation</term><term>Rare-earth oxides</term><term>Supported catalyst</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Activité catalytique</term><term>Catalyse hétérogène</term><term>Catalyseur sur support</term><term>Copulation oxydante</term><term>Etude expérimentale</term><term>Hydrocarbure</term><term>Lanthane oxyde</term><term>Méthane</term><term>Nickel</term><term>Oxydation</term><term>Préparation</term><term>Réaction catalytique</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Hydrocarbure</term><term>Nickel</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The oxidative transformation of methane over Ni catalysts supported on La, Sm and Ce oxides was investigated at atmospheric pressure, T=723–923K and CH4/O2=1–10. The BET surface areas were low (3–22m2g−1) and decreased strongly after reaction (down to 0.5m2g−1). Carbonate species, Ni2O3 and supported oxides were identified by XRD or IR spectroscopy studies in both the fresh and used catalysts. The Ni° phase was also probably formed as amorphous phase. The oxidative coupling of methane route passed through a minimum as a function of the Ni percentage and was favored by the Ce or Sm oxide support, Li additive and low reaction temperature. High selectivities (60–90%) and good yields (about 15%) in C2 hydrocarbons with low carbon balance (0–10%) were obtained at 823K. La supported oxide, Ba additive and high reaction temperature favored the partial oxidation of methane. The obtained results were discussed in the light of the reducibility and acid–base properties of the catalysts.</div></front></TEI><affiliations><list><country><li>Algérie</li><li>France</li></country><region><li>Grand Est</li><li>Lorraine (région)</li></region><settlement><li>Vandoeuvre-les-Nancy</li></settlement></list><tree><country name="Algérie"><noRegion><name sortKey="Djaidja, A" sort="Djaidja, A" uniqKey="Djaidja A" first="A" last="Djaidja">A. Djaidja</name></noRegion><name sortKey="Barama, A" sort="Barama, A" uniqKey="Barama A" first="A" last="Barama">A. Barama</name></country><country name="France"><region name="Grand Est"><name sortKey="Bettahar, M M" sort="Bettahar, M M" uniqKey="Bettahar M" first="M. M" last="Bettahar">M. M Bettahar</name></region><name sortKey="Bettahar, M M" sort="Bettahar, M M" uniqKey="Bettahar M" first="M. M" last="Bettahar">M. M Bettahar</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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