Titania-supported cobalt and cobalt-phosphorus catalysts : Characterization and performances in ethane oxidative dehydrogenation
Identifieur interne : 000027 ( PascalFrancis/Curation ); précédent : 000026; suivant : 000028Titania-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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<series><title level="j" type="main">Journal of catalysis : (Print)</title>
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<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>
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<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>
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-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>
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<s5>16</s5>
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<s5>16</s5>
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<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>
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<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>
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<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>
</record>
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