Steam reforming of methane to syngas over NiAl2O4 spinel catalysts
Identifieur interne : 000100 ( France/Analysis ); précédent : 000099; suivant : 000101Steam reforming of methane to syngas over NiAl2O4 spinel catalysts
Auteurs : N. Salvi [Algérie] ; A. Boulahouache [Algérie] ; C. Petit [France] ; A. Kiennemann [France] ; C. Rabia [Algérie]Source :
- International journal of hydrogen energy [ 0360-3199 ] ; 2011.
Descripteurs français
- Pascal (Inist)
- Reformage vapeur, Méthane, Gaz synthèse, Spinelle, Catalyseur, Oxyde de nickel, Procédé sol gel, Diffractométrie RX, Microscopie électronique balayage, Microscopie électronique transmission, Aire superficielle, Structure cristalline, Nickel, Aluminium, Matériau cristallin, Frittage, Conversion catalytique, Haute performance, Stabilité, Hydrogène.
- Wicri :
English descriptors
- KwdEn :
- Aluminium, Catalyst, Catalytic conversion, Crystalline material, Crystalline structure, High performance, Hydrogen, Methane, Nickel, Nickel oxide, Scanning electron microscopy, Sintering, Sol gel process, Spinel, Stability, Steam reforming, Surface area, Synthesis gas, Transmission electron microscopy, X ray diffractometry.
Abstract
A series of several mixed oxides close to NiAl2O4 (NiAl2O4, 5 wt% NiO/NiAl2O4, 10 wt% NiO/ NiAl2O4 and 15 wt% NiO/NiAl2O4) were prepared by a pseudo sol gel method using propionic acid then calcinated at 900 °C during 4 h. The catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), surface areas (BET) and temperature-programmed reduction (TPR). The nature of the crystalline structure, the surface area and the reduction temperature depend on the Ni/ Al ratio. For the stoichiometric ratio Ni/Al exactly equal to 0.5, homogeneous crystalline spinel phase was formed after temperature of calcination was equal or higher than 725 °C. The spinel structure being a non-tolerant structure for an excess of Ni, when Ni/Al is higher than 0.5, free NiO in strong interaction with the spinel was present and favoured the reduction of the nickel of the structure at lower temperature compared to the spinel. Till 700 °C, the spinel structure was well conserved even if it was partially reduced. For a temperature higher than 700 °C, the structure leads to Ni species formation on γ-Al2O3. Comparative steam reforming of methane was conducted to control the formation of Ni and its sintering. The stoichiometric spinel showed relevant catalytic performances: high CH4 conversion, high selectivities of CO and H2 and low carbon formation. The presence of nickel inside the spinel structure of NiAl2O4 catalyst confers a high stability and strong dispersion for the metallic particles. The low formation of carbon was due to the high dispersion and the limited growing of the Ni particles on γ-Al2O3. Over 5 wt% of NiO excess, a rough decrease of the CH4 conversion, CO and H2 selectivities were observed. The x wt% NiO/NiAl2O4 systems give an important carbon formation due to a large Ni particle formation after rapid sintering.
Affiliations:
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Salvi</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Laboratoire de Chimie du Gaz Naturel, Faculté de Chimie, USTHB 109, El-Alia Bab Ezzouar</s1><s2>Alger</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>Algérie</country><placeName><settlement type="city">Alger</settlement><region nuts="2">Wilaya d'Alger</region></placeName></affiliation></author><author><name sortKey="Boulahouache, A" sort="Boulahouache, A" uniqKey="Boulahouache A" first="A." last="Boulahouache">A. Boulahouache</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Laboratoire LCPMM, département de chimie, Faculté ses sciences, U. Blida, route de soumaa, BP</s1><s2>Blida</s2><s3>DZA</s3><sZ>2 aut.</sZ></inist:fA14><country>Algérie</country><wicri:noRegion>Blida</wicri:noRegion></affiliation></author><author><name sortKey="Petit, C" sort="Petit, C" uniqKey="Petit C" first="C." last="Petit">C. Petit</name><affiliation wicri:level="3"><inist:fA14 i1="03"><s1>Ecole de Chimie, Polymères et Matériaux - Laboratoire Matériaux, Surface, Procédés pour la Catalyse (LMSPC), UMR CNRS 7515 - 25, rue Becquerel</s1><s2>67087 Strasbourg</s2><s3>FRA</s3><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Alsace (région administrative)</region><settlement type="city">Strasbourg</settlement></placeName></affiliation></author><author><name sortKey="Kiennemann, A" sort="Kiennemann, A" uniqKey="Kiennemann A" first="A." last="Kiennemann">A. Kiennemann</name><affiliation wicri:level="3"><inist:fA14 i1="03"><s1>Ecole de Chimie, Polymères et Matériaux - Laboratoire Matériaux, Surface, Procédés pour la Catalyse (LMSPC), UMR CNRS 7515 - 25, rue Becquerel</s1><s2>67087 Strasbourg</s2><s3>FRA</s3><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Alsace (région administrative)</region><settlement type="city">Strasbourg</settlement></placeName></affiliation></author><author><name sortKey="Rabia, C" sort="Rabia, C" uniqKey="Rabia C" first="C." last="Rabia">C. Rabia</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Laboratoire de Chimie du Gaz Naturel, Faculté de Chimie, USTHB 109, El-Alia Bab Ezzouar</s1><s2>Alger</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>Algérie</country><placeName><settlement type="city">Alger</settlement><region nuts="2">Wilaya d'Alger</region></placeName></affiliation></author></analytic><series><title level="j" type="main">International journal of hydrogen energy</title><title level="j" type="abbreviated">Int. j. hydrogen energy</title><idno type="ISSN">0360-3199</idno><imprint><date when="2011">2011</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">International journal of hydrogen energy</title><title level="j" type="abbreviated">Int. j. hydrogen energy</title><idno type="ISSN">0360-3199</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Aluminium</term><term>Catalyst</term><term>Catalytic conversion</term><term>Crystalline material</term><term>Crystalline structure</term><term>High performance</term><term>Hydrogen</term><term>Methane</term><term>Nickel</term><term>Nickel oxide</term><term>Scanning electron microscopy</term><term>Sintering</term><term>Sol gel process</term><term>Spinel</term><term>Stability</term><term>Steam reforming</term><term>Surface area</term><term>Synthesis gas</term><term>Transmission electron microscopy</term><term>X ray diffractometry</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Reformage vapeur</term><term>Méthane</term><term>Gaz synthèse</term><term>Spinelle</term><term>Catalyseur</term><term>Oxyde de nickel</term><term>Procédé sol gel</term><term>Diffractométrie RX</term><term>Microscopie électronique balayage</term><term>Microscopie électronique transmission</term><term>Aire superficielle</term><term>Structure cristalline</term><term>Nickel</term><term>Aluminium</term><term>Matériau cristallin</term><term>Frittage</term><term>Conversion catalytique</term><term>Haute performance</term><term>Stabilité</term><term>Hydrogène</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Nickel</term><term>Aluminium</term><term>Hydrogène</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">A series of several mixed oxides close to NiAl<sub>2</sub>O<sub>4</sub> (NiAl<sub>2</sub>O<sub>4</sub>, 5 wt% NiO/NiAl<sub>2</sub>O<sub>4</sub>, 10 wt% NiO/ NiAl<sub>2</sub>O<sub>4</sub> and 15 wt% NiO/NiAl<sub>2</sub>O<sub>4</sub>) were prepared by a pseudo sol gel method using propionic acid then calcinated at 900 °C during 4 h. The catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), surface areas (BET) and temperature-programmed reduction (TPR). The nature of the crystalline structure, the surface area and the reduction temperature depend on the Ni/ Al ratio. For the stoichiometric ratio Ni/Al exactly equal to 0.5, homogeneous crystalline spinel phase was formed after temperature of calcination was equal or higher than 725 °C. The spinel structure being a non-tolerant structure for an excess of Ni, when Ni/Al is higher than 0.5, free NiO in strong interaction with the spinel was present and favoured the reduction of the nickel of the structure at lower temperature compared to the spinel. Till 700 °C, the spinel structure was well conserved even if it was partially reduced. For a temperature higher than 700 °C, the structure leads to Ni species formation on γ-Al<sub>2</sub>O<sub>3</sub>. Comparative steam reforming of methane was conducted to control the formation of Ni and its sintering. The stoichiometric spinel showed relevant catalytic performances: high CH<sub>4</sub> conversion, high selectivities of CO and H<sub>2</sub> and low carbon formation. The presence of nickel inside the spinel structure of NiAl<sub>2</sub>O<sub>4</sub> catalyst confers a high stability and strong dispersion for the metallic particles. The low formation of carbon was due to the high dispersion and the limited growing of the Ni particles on γ-Al<sub>2</sub>O<sub>3</sub>. Over 5 wt% of NiO excess, a rough decrease of the CH<sub>4</sub> conversion, CO and H<sub>2</sub> selectivities were observed. The x wt% NiO/NiAl<sub>2</sub>O<sub>4</sub> systems give an important carbon formation due to a large Ni particle formation after rapid sintering.</div></front></TEI><affiliations><list><country><li>Algérie</li><li>France</li></country><region><li>Alsace (région administrative)</li><li>Grand Est</li><li>Wilaya d'Alger</li></region><settlement><li>Alger</li><li>Strasbourg</li></settlement></list><tree><country name="Algérie"><region name="Wilaya d'Alger"><name sortKey="Salvi, N" sort="Salvi, N" uniqKey="Salvi N" first="N." last="Salvi">N. Salvi</name></region><name sortKey="Boulahouache, A" sort="Boulahouache, A" uniqKey="Boulahouache A" first="A." last="Boulahouache">A. Boulahouache</name><name sortKey="Rabia, C" sort="Rabia, C" uniqKey="Rabia C" first="C." last="Rabia">C. Rabia</name></country><country name="France"><region name="Grand Est"><name sortKey="Petit, C" sort="Petit, C" uniqKey="Petit C" first="C." last="Petit">C. Petit</name></region><name sortKey="Kiennemann, A" sort="Kiennemann, A" uniqKey="Kiennemann A" first="A." last="Kiennemann">A. Kiennemann</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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