Titania-supported cobalt and cobalt-phosphorus catalysts : Characterization and performances in ethane oxidative dehydrogenation
Identifieur interne : 000259 ( PascalFrancis/Checkpoint ); précédent : 000258; suivant : 000260Titania-supported cobalt and cobalt-phosphorus catalysts : Characterization and performances in ethane oxidative dehydrogenation
Auteurs : Younes Brik [Maroc, France] ; Mohamed Kacimi [Maroc] ; Mahfoud Ziyad [Maroc] ; Francois Bozon-Verduraz [France]Source :
- Journal of catalysis : (Print) [ 0021-9517 ] ; 2001.
Descripteurs français
- Pascal (Inist)
- Réflexion diffuse, Spectre Raman, Diffraction RX, Spectrométrie photoélectron, Imprégnation, Calcination, Etude expérimentale, Catalyseur sur support, Cobalt, Cobalt Phosphore, Préparation, Titane Oxyde, Réaction catalytique, Déshydrogénation, Oxydation, Ethane, Alcane, Hydrocarbure, Activité catalytique, Catalyse hétérogène.
- Wicri :
- topic : Cobalt, Hydrocarbure.
English descriptors
- KwdEn :
- Alkane, Calcining, Catalyst activity, Catalytic reaction, Cobalt, Cobalt Phosphorus, Dehydrogenation, Diffuse reflection, Ethane, Experimental study, Heterogeneous catalysis, Hydrocarbon, Impregnation, Oxidation, Photoelectron spectrometry, Preparation, Raman spectrum, Supported catalyst, Titanium Oxides, X ray diffraction.
Abstract
TiO2-supported Cobalt and cobalt-phosphorus catalysts prepared by impregnation are characterized by XRD, XPS, Laser Raman Spectroscopy (LRS), and Diffuse Reflectance Spectroscopy (DRS) and investigated in ethane oxidative dehydrogenation (ODH). At low cobalt loadings, the carrier is essentially covered by octahedral Co2+ ions, whereas at concentrations superior to 3.7 wt% formation of the Co3O4 spinel is observed. The best performance in ethane ODH is achieved at 550°C with the sample containing 7.6 wt% Co. The reaction begins with a conversion of 33% and a selectivity around 75%, then it decreases to reach after 150 min on stream a stationary state at 22% of conversion and 60% selectivity. This loss of 30% of the initial activity may be associated with a decrease of the specific surface area and the concomitant formation of CoTiO3 and Co2TiO4, as revealed by LRS, in situ DRS, and XPS analysis. The activity in ethane ODH seems to be mainly related to the presence of Co2+ ions octahedral sites. Addition of phosphorus to Co(7.6)/TiO2 catalysts results in the reduction of Co3+ ions and a growth of amorphous cobalt-phosphorus compounds which provoke a severe decrease of the catalyst performance.
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aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Maroc</country><placeName><settlement type="city">Rabat</settlement><region nuts="2">Rabat-Salé-Kénitra</region></placeName></affiliation><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Laboratoire de Chimie des Matériaux Divisés et Catalyse, Université Paris 7-Denis Diderot, 2, place Jussieu</s1><s2>75251 Paris</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Île-de-France</region><settlement type="city">Paris</settlement></placeName></affiliation></author><author><name sortKey="Kacimi, Mohamed" sort="Kacimi, Mohamed" uniqKey="Kacimi M" first="Mohamed" last="Kacimi">Mohamed Kacimi</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Faculté des Sciences, Département de Chimie, Laboratoire de Physico-chimie des Matériaux et Catalyse, Avenue Ibn Battouta, B.P. 1017</s1><s2>Rabat</s2><s3>MAR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Maroc</country><placeName><settlement type="city">Rabat</settlement><region nuts="2">Rabat-Salé-Kénitra</region></placeName></affiliation></author><author><name sortKey="Ziyad, Mahfoud" sort="Ziyad, Mahfoud" uniqKey="Ziyad M" first="Mahfoud" last="Ziyad">Mahfoud Ziyad</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Faculté des Sciences, Département de Chimie, Laboratoire de Physico-chimie des Matériaux et Catalyse, Avenue Ibn Battouta, B.P. 1017</s1><s2>Rabat</s2><s3>MAR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Maroc</country><placeName><settlement type="city">Rabat</settlement><region nuts="2">Rabat-Salé-Kénitra</region></placeName></affiliation></author><author><name sortKey="Bozon Verduraz, Francois" sort="Bozon Verduraz, Francois" uniqKey="Bozon Verduraz F" first="Francois" last="Bozon-Verduraz">Francois Bozon-Verduraz</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Laboratoire de Chimie des Matériaux Divisés et Catalyse, Université Paris 7-Denis Diderot, 2, place Jussieu</s1><s2>75251 Paris</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Île-de-France</region><settlement type="city">Paris</settlement></placeName></affiliation></author></analytic><series><title level="j" type="main">Journal of catalysis : (Print)</title><title level="j" type="abbreviated">J. catal. : (Print)</title><idno type="ISSN">0021-9517</idno><imprint><date when="2001">2001</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of catalysis : (Print)</title><title level="j" type="abbreviated">J. catal. : (Print)</title><idno type="ISSN">0021-9517</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Alkane</term><term>Calcining</term><term>Catalyst activity</term><term>Catalytic reaction</term><term>Cobalt</term><term>Cobalt Phosphorus</term><term>Dehydrogenation</term><term>Diffuse reflection</term><term>Ethane</term><term>Experimental study</term><term>Heterogeneous catalysis</term><term>Hydrocarbon</term><term>Impregnation</term><term>Oxidation</term><term>Photoelectron spectrometry</term><term>Preparation</term><term>Raman spectrum</term><term>Supported catalyst</term><term>Titanium Oxides</term><term>X ray diffraction</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Réflexion diffuse</term><term>Spectre Raman</term><term>Diffraction RX</term><term>Spectrométrie photoélectron</term><term>Imprégnation</term><term>Calcination</term><term>Etude expérimentale</term><term>Catalyseur sur support</term><term>Cobalt</term><term>Cobalt Phosphore</term><term>Préparation</term><term>Titane Oxyde</term><term>Réaction catalytique</term><term>Déshydrogénation</term><term>Oxydation</term><term>Ethane</term><term>Alcane</term><term>Hydrocarbure</term><term>Activité catalytique</term><term>Catalyse hétérogène</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Cobalt</term><term>Hydrocarbure</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">TiO<sub>2</sub>-supported Cobalt and cobalt-phosphorus catalysts prepared by impregnation are characterized by XRD, XPS, Laser Raman Spectroscopy (LRS), and Diffuse Reflectance Spectroscopy (DRS) and investigated in ethane oxidative dehydrogenation (ODH). At low cobalt loadings, the carrier is essentially covered by octahedral Co<sup>2+</sup> ions, whereas at concentrations superior to 3.7 wt% formation of the Co<sub>3</sub>O<sub>4</sub> spinel is observed. The best performance in ethane ODH is achieved at 550°C with the sample containing 7.6 wt% Co. The reaction begins with a conversion of 33% and a selectivity around 75%, then it decreases to reach after 150 min on stream a stationary state at 22% of conversion and 60% selectivity. This loss of 30% of the initial activity may be associated with a decrease of the specific surface area and the concomitant formation of CoTiO<sub>3</sub> and Co<sub>2</sub>TiO<sub>4</sub>, as revealed by LRS, in situ DRS, and XPS analysis. The activity in ethane ODH seems to be mainly related to the presence of Co<sup>2+</sup> ions octahedral sites. Addition of phosphorus to Co(7.6)/TiO<sub>2</sub> catalysts results in the reduction of Co<sup>3+</sup> ions and a growth of amorphous cobalt-phosphorus compounds which provoke a severe decrease of the catalyst performance.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0021-9517</s0></fA01><fA02 i1="01"><s0>JCTLA5</s0></fA02><fA03 i2="1"><s0>J. catal. : (Print)</s0></fA03><fA05><s2>202</s2></fA05><fA06><s2>1</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Titania-supported cobalt and cobalt-phosphorus catalysts : Characterization and performances in ethane oxidative dehydrogenation</s1></fA08><fA11 i1="01" i2="1"><s1>BRIK (Younes)</s1></fA11><fA11 i1="02" i2="1"><s1>KACIMI (Mohamed)</s1></fA11><fA11 i1="03" i2="1"><s1>ZIYAD (Mahfoud)</s1></fA11><fA11 i1="04" i2="1"><s1>BOZON-VERDURAZ (Francois)</s1></fA11><fA14 i1="01"><s1>Faculté des Sciences, Département de Chimie, Laboratoire de Physico-chimie des Matériaux et Catalyse, Avenue Ibn Battouta, B.P. 1017</s1><s2>Rabat</s2><s3>MAR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></fA14><fA14 i1="02"><s1>Laboratoire de Chimie des Matériaux Divisés et Catalyse, Université Paris 7-Denis Diderot, 2, place Jussieu</s1><s2>75251 Paris</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ></fA14><fA20><s1>118-128</s1></fA20><fA21><s1>2001</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>9623</s2><s5>354000099437060120</s5></fA43><fA44><s0>0000</s0><s1>© 2001 INIST-CNRS. All rights reserved.</s1></fA44><fA45><s0>38 ref.</s0></fA45><fA47 i1="01" i2="1"><s0>01-0481834</s0></fA47><fA60><s1>P</s1></fA60><fA61><s0>A</s0></fA61><fA64 i1="01" i2="1"><s0>Journal of catalysis : (Print)</s0></fA64><fA66 i1="01"><s0>USA</s0></fA66><fC01 i1="01" l="ENG"><s0>TiO<sub>2</sub>-supported Cobalt and cobalt-phosphorus catalysts prepared by impregnation are characterized by XRD, XPS, Laser Raman Spectroscopy (LRS), and Diffuse Reflectance Spectroscopy (DRS) and investigated in ethane oxidative dehydrogenation (ODH). At low cobalt loadings, the carrier is essentially covered by octahedral Co<sup>2+</sup> ions, whereas at concentrations superior to 3.7 wt% formation of the Co<sub>3</sub>O<sub>4</sub> spinel is observed. The best performance in ethane ODH is achieved at 550°C with the sample containing 7.6 wt% Co. The reaction begins with a conversion of 33% and a selectivity around 75%, then it decreases to reach after 150 min on stream a stationary state at 22% of conversion and 60% selectivity. This loss of 30% of the initial activity may be associated with a decrease of the specific surface area and the concomitant formation of CoTiO<sub>3</sub> and Co<sub>2</sub>TiO<sub>4</sub>, as revealed by LRS, in situ DRS, and XPS analysis. The activity in ethane ODH seems to be mainly related to the presence of Co<sup>2+</sup> ions octahedral sites. Addition of phosphorus to Co(7.6)/TiO<sub>2</sub> catalysts results in the reduction of Co<sup>3+</sup> ions and a growth of amorphous cobalt-phosphorus compounds which provoke a severe decrease of the catalyst performance.</s0></fC01><fC02 i1="01" i2="X"><s0>001C01A03B</s0></fC02><fC03 i1="01" i2="X" l="FRE"><s0>Réflexion diffuse</s0><s5>01</s5></fC03><fC03 i1="01" i2="X" l="ENG"><s0>Diffuse reflection</s0><s5>01</s5></fC03><fC03 i1="01" i2="X" l="SPA"><s0>Reflexión difusa</s0><s5>01</s5></fC03><fC03 i1="02" i2="X" l="FRE"><s0>Spectre Raman</s0><s5>02</s5></fC03><fC03 i1="02" i2="X" l="ENG"><s0>Raman spectrum</s0><s5>02</s5></fC03><fC03 i1="02" i2="X" l="SPA"><s0>Espectro Raman</s0><s5>02</s5></fC03><fC03 i1="03" i2="X" l="FRE"><s0>Diffraction RX</s0><s5>03</s5></fC03><fC03 i1="03" i2="X" l="ENG"><s0>X ray diffraction</s0><s5>03</s5></fC03><fC03 i1="03" i2="X" l="SPA"><s0>Difracción RX</s0><s5>03</s5></fC03><fC03 i1="04" i2="X" l="FRE"><s0>Spectrométrie photoélectron</s0><s5>04</s5></fC03><fC03 i1="04" i2="X" l="ENG"><s0>Photoelectron spectrometry</s0><s5>04</s5></fC03><fC03 i1="04" i2="X" l="SPA"><s0>Espectrometría fotoelectrón</s0><s5>04</s5></fC03><fC03 i1="05" i2="X" l="FRE"><s0>Imprégnation</s0><s5>09</s5></fC03><fC03 i1="05" i2="X" l="ENG"><s0>Impregnation</s0><s5>09</s5></fC03><fC03 i1="05" i2="X" l="SPA"><s0>Impregnación</s0><s5>09</s5></fC03><fC03 i1="06" i2="X" l="FRE"><s0>Calcination</s0><s5>15</s5></fC03><fC03 i1="06" i2="X" l="ENG"><s0>Calcining</s0><s5>15</s5></fC03><fC03 i1="06" i2="X" l="SPA"><s0>Calcinación</s0><s5>15</s5></fC03><fC03 i1="07" i2="X" l="FRE"><s0>Etude expérimentale</s0><s5>16</s5></fC03><fC03 i1="07" i2="X" l="ENG"><s0>Experimental study</s0><s5>16</s5></fC03><fC03 i1="07" i2="X" l="SPA"><s0>Estudio experimental</s0><s5>16</s5></fC03><fC03 i1="08" i2="X" l="FRE"><s0>Catalyseur sur support</s0><s5>17</s5></fC03><fC03 i1="08" i2="X" l="ENG"><s0>Supported catalyst</s0><s5>17</s5></fC03><fC03 i1="08" i2="X" l="SPA"><s0>Catalizador sobre soporte</s0><s5>17</s5></fC03><fC03 i1="09" i2="X" l="FRE"><s0>Cobalt</s0><s1>ACT</s1><s2>NC</s2><s5>19</s5></fC03><fC03 i1="09" i2="X" l="ENG"><s0>Cobalt</s0><s1>ACT</s1><s2>NC</s2><s5>19</s5></fC03><fC03 i1="09" i2="X" l="SPA"><s0>Cobalto</s0><s1>ACT</s1><s2>NC</s2><s5>19</s5></fC03><fC03 i1="10" i2="X" l="FRE"><s0>Cobalt Phosphore</s0><s1>ACT</s1><s2>NC</s2><s5>20</s5></fC03><fC03 i1="10" i2="X" l="ENG"><s0>Cobalt Phosphorus</s0><s1>ACT</s1><s2>NC</s2><s5>20</s5></fC03><fC03 i1="10" i2="X" l="SPA"><s0>Cobalto Fósforo</s0><s1>ACT</s1><s2>NC</s2><s5>20</s5></fC03><fC03 i1="11" i2="X" l="FRE"><s0>Préparation</s0><s5>21</s5></fC03><fC03 i1="11" i2="X" l="ENG"><s0>Preparation</s0><s5>21</s5></fC03><fC03 i1="11" i2="X" l="SPA"><s0>Preparación</s0><s5>21</s5></fC03><fC03 i1="12" i2="X" l="FRE"><s0>Titane Oxyde</s0><s1>SUB</s1><s2>NC</s2><s2>NA</s2><s5>22</s5></fC03><fC03 i1="12" i2="X" l="ENG"><s0>Titanium Oxides</s0><s1>SUB</s1><s2>NC</s2><s2>NA</s2><s5>22</s5></fC03><fC03 i1="12" i2="X" l="SPA"><s0>Titanio Óxido</s0><s1>SUB</s1><s2>NC</s2><s2>NA</s2><s5>22</s5></fC03><fC03 i1="13" i2="X" l="FRE"><s0>Réaction catalytique</s0><s5>23</s5></fC03><fC03 i1="13" i2="X" l="ENG"><s0>Catalytic reaction</s0><s5>23</s5></fC03><fC03 i1="13" i2="X" l="SPA"><s0>Reacción catalítica</s0><s5>23</s5></fC03><fC03 i1="14" i2="X" l="FRE"><s0>Déshydrogénation</s0><s5>24</s5></fC03><fC03 i1="14" i2="X" l="ENG"><s0>Dehydrogenation</s0><s5>24</s5></fC03><fC03 i1="14" i2="X" l="SPA"><s0>Deshidrogenación</s0><s5>24</s5></fC03><fC03 i1="15" i2="X" l="FRE"><s0>Oxydation</s0><s5>25</s5></fC03><fC03 i1="15" i2="X" l="ENG"><s0>Oxidation</s0><s5>25</s5></fC03><fC03 i1="15" i2="X" l="SPA"><s0>Oxidación</s0><s5>25</s5></fC03><fC03 i1="16" i2="X" l="FRE"><s0>Ethane</s0><s1>ENT</s1><s2>NK</s2><s5>26</s5></fC03><fC03 i1="16" i2="X" l="ENG"><s0>Ethane</s0><s1>ENT</s1><s2>NK</s2><s5>26</s5></fC03><fC03 i1="16" i2="X" l="SPA"><s0>Etano</s0><s1>ENT</s1><s2>NK</s2><s5>26</s5></fC03><fC03 i1="17" i2="X" l="FRE"><s0>Alcane</s0><s5>27</s5></fC03><fC03 i1="17" i2="X" l="ENG"><s0>Alkane</s0><s5>27</s5></fC03><fC03 i1="17" i2="X" l="SPA"><s0>Alcano</s0><s5>27</s5></fC03><fC03 i1="18" i2="X" l="FRE"><s0>Hydrocarbure</s0><s2>FX</s2><s5>28</s5></fC03><fC03 i1="18" i2="X" l="ENG"><s0>Hydrocarbon</s0><s2>FX</s2><s5>28</s5></fC03><fC03 i1="18" i2="X" l="SPA"><s0>Hidrocarburo</s0><s2>FX</s2><s5>28</s5></fC03><fC03 i1="19" i2="X" l="FRE"><s0>Activité catalytique</s0><s5>29</s5></fC03><fC03 i1="19" i2="X" l="ENG"><s0>Catalyst activity</s0><s5>29</s5></fC03><fC03 i1="19" i2="X" l="SPA"><s0>Actividad catalítica</s0><s5>29</s5></fC03><fC03 i1="20" i2="X" l="FRE"><s0>Catalyse hétérogène</s0><s5>30</s5></fC03><fC03 i1="20" i2="X" l="ENG"><s0>Heterogeneous catalysis</s0><s5>30</s5></fC03><fC03 i1="20" i2="X" l="SPA"><s0>Catálisis heterogénea</s0><s5>30</s5></fC03><fC07 i1="01" i2="X" l="FRE"><s0>Métal transition</s0><s2>NC</s2><s5>18</s5></fC07><fC07 i1="01" i2="X" l="ENG"><s0>Transition metal</s0><s2>NC</s2><s5>18</s5></fC07><fC07 i1="01" i2="X" l="SPA"><s0>Metal transición</s0><s2>NC</s2><s5>18</s5></fC07><fN21><s1>344</s1></fN21></pA></standard></inist><affiliations><list><country><li>France</li><li>Maroc</li></country><region><li>Rabat-Salé-Kénitra</li><li>Île-de-France</li></region><settlement><li>Paris</li><li>Rabat</li></settlement></list><tree><country name="Maroc"><region name="Rabat-Salé-Kénitra"><name sortKey="Brik, Younes" sort="Brik, Younes" uniqKey="Brik Y" first="Younes" last="Brik">Younes Brik</name></region><name sortKey="Kacimi, Mohamed" sort="Kacimi, Mohamed" uniqKey="Kacimi M" first="Mohamed" last="Kacimi">Mohamed Kacimi</name><name sortKey="Ziyad, Mahfoud" sort="Ziyad, Mahfoud" uniqKey="Ziyad M" first="Mahfoud" last="Ziyad">Mahfoud Ziyad</name></country><country name="France"><region name="Île-de-France"><name sortKey="Brik, Younes" sort="Brik, Younes" uniqKey="Brik Y" first="Younes" last="Brik">Younes Brik</name></region><name sortKey="Bozon Verduraz, Francois" sort="Bozon Verduraz, Francois" uniqKey="Bozon Verduraz F" first="Francois" last="Bozon-Verduraz">Francois Bozon-Verduraz</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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|texte= Titania-supported cobalt and cobalt-phosphorus catalysts : Characterization and performances in ethane oxidative dehydrogenation
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