Acidity study of X zeolites modified by nickel and/or chromium cations in the case of binary and ternary exchanges
Identifieur interne : 000292 ( Main/Exploration ); précédent : 000291; suivant : 000293Acidity study of X zeolites modified by nickel and/or chromium cations in the case of binary and ternary exchanges
Auteurs : Souhila Bendenia [Algérie] ; Isabelle Batonneau-Gener [France] ; Jean-Dominique Comparot [France] ; Kheira Marouf-Khelifa [Algérie] ; Habib Hammoudi [Algérie] ; Amine Khelifa [Algérie]Source :
- Microporous and mesoporous materials [ 1387-1811 ] ; 2012.
Descripteurs français
- Pascal (Inist)
- Acidité, Zéolite, Nickel, Chrome, Pyridine, Matériau poreux, Echange ion, Azote, Adsorption, Diffraction RX, Analyse thermique différentielle, Thermogravimétrie, Désorption, Spectrométrie IR, Site acide, Echange cation, Cristallinité, Micropore, Microporosité, Acide Lewis, Site Lewis, Site Brönsted.
- Wicri :
English descriptors
- KwdEn :
- Acidic site, Acidity, Adsorption, Bronsted site, Cation exchange, Chromium, Crystallinity, Desorption, Differential thermal analysis, Infrared spectrometry, Ion exchange, Lewis acid, Lewis site, Micropore, Microporosity, Nickel, Nitrogen, Porous material, Pyridine, Thermogravimetry, X ray diffraction, Zeolite.
Abstract
A series of Ni(x)-, Cr(x) and CrNi(x)-exchanged X zeolites (x being the ion-exchange degree) was prepared and characterised by nitrogen adsorption, XRD, DTA/TGA and pyridine adsorption-desorption followed by IR spectroscopy. The objective is mainly to estimate quantitatively the number, strength and nature of acid sites and their dependence on the type of cation and its exchange level. A comparison between the binary and ternary exchanges was also established. The crystallinity and micropore volume losses were more significant for Cr(x)X and CrNi(x)X. The concentration of Lewis acid sites decreases with increasing the exchange degree for Cr(x)X and Ni(x)X, while it increases up to 39% for CrNi(x)X. An increase of the concentration of Brønsted sites was obtained. The fact that both the Lewis and Brønsted acidities markedly decrease between 423 and 623 K, proves that the available acid sites are overall weak. The pyridine desorption from the protonic sites is easier with CrNi(39)X than with Cr(39)X and Ni(40)X at 623 K, indicating a decrease in the strength in the case of ternary exchange.
Affiliations:
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first="Souhila" last="Bendenia">Souhila Bendenia</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Structure, Elaboration et Applications des Matériaux Moléculaires (S.E.A.2M.), Département de Chimie, Université de Mostaganem, B.P. 981, R.P.</s1><s2>Mostaganem 27000</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Algérie</country><wicri:noRegion>Mostaganem 27000</wicri:noRegion></affiliation></author><author><name sortKey="Batonneau Gener, Isabelle" sort="Batonneau Gener, Isabelle" uniqKey="Batonneau Gener I" first="Isabelle" last="Batonneau-Gener">Isabelle Batonneau-Gener</name><affiliation wicri:level="4"><inist:fA14 i1="02"><s1>Institut de Chimie des Milieux et Matériaux de Poitiers IC2MP - UMR 7285 CNRS-Université de Poitiers, 4 rue Michel Brunet</s1><s2>86022 Poitiers</s2><s3>FRA</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" 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Kheira" sort="Marouf Khelifa, Kheira" uniqKey="Marouf Khelifa K" first="Kheira" last="Marouf-Khelifa">Kheira Marouf-Khelifa</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Structure, Elaboration et Applications des Matériaux Moléculaires (S.E.A.2M.), Département de Chimie, Université de Mostaganem, B.P. 981, R.P.</s1><s2>Mostaganem 27000</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Algérie</country><wicri:noRegion>Mostaganem 27000</wicri:noRegion></affiliation></author><author><name sortKey="Hammoudi, Habib" sort="Hammoudi, Habib" uniqKey="Hammoudi H" first="Habib" last="Hammoudi">Habib Hammoudi</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Structure, Elaboration et Applications des Matériaux Moléculaires (S.E.A.2M.), Département de Chimie, Université de Mostaganem, B.P. 981, R.P.</s1><s2>Mostaganem 27000</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Algérie</country><wicri:noRegion>Mostaganem 27000</wicri:noRegion></affiliation></author><author><name sortKey="Khelifa, Amine" sort="Khelifa, Amine" uniqKey="Khelifa A" first="Amine" last="Khelifa">Amine Khelifa</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Structure, Elaboration et Applications des Matériaux Moléculaires (S.E.A.2M.), Département de Chimie, Université de Mostaganem, B.P. 981, R.P.</s1><s2>Mostaganem 27000</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Algérie</country><wicri:noRegion>Mostaganem 27000</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Microporous and mesoporous materials</title><title level="j" type="abbreviated">Microporous mesoporous mater.</title><idno type="ISSN">1387-1811</idno><imprint><date when="2012">2012</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Microporous and mesoporous materials</title><title level="j" type="abbreviated">Microporous mesoporous mater.</title><idno type="ISSN">1387-1811</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Acidic site</term><term>Acidity</term><term>Adsorption</term><term>Bronsted site</term><term>Cation exchange</term><term>Chromium</term><term>Crystallinity</term><term>Desorption</term><term>Differential thermal analysis</term><term>Infrared spectrometry</term><term>Ion exchange</term><term>Lewis acid</term><term>Lewis site</term><term>Micropore</term><term>Microporosity</term><term>Nickel</term><term>Nitrogen</term><term>Porous material</term><term>Pyridine</term><term>Thermogravimetry</term><term>X ray diffraction</term><term>Zeolite</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Acidité</term><term>Zéolite</term><term>Nickel</term><term>Chrome</term><term>Pyridine</term><term>Matériau poreux</term><term>Echange ion</term><term>Azote</term><term>Adsorption</term><term>Diffraction RX</term><term>Analyse thermique différentielle</term><term>Thermogravimétrie</term><term>Désorption</term><term>Spectrométrie IR</term><term>Site acide</term><term>Echange cation</term><term>Cristallinité</term><term>Micropore</term><term>Microporosité</term><term>Acide Lewis</term><term>Site Lewis</term><term>Site Brönsted</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Nickel</term><term>Chrome</term><term>Azote</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">A series of Ni(x)-, Cr(x) and CrNi(x)-exchanged X zeolites (x being the ion-exchange degree) was prepared and characterised by nitrogen adsorption, XRD, DTA/TGA and pyridine adsorption-desorption followed by IR spectroscopy. The objective is mainly to estimate quantitatively the number, strength and nature of acid sites and their dependence on the type of cation and its exchange level. A comparison between the binary and ternary exchanges was also established. The crystallinity and micropore volume losses were more significant for Cr(x)X and CrNi(x)X. The concentration of Lewis acid sites decreases with increasing the exchange degree for Cr(x)X and Ni(x)X, while it increases up to 39% for CrNi(x)X. An increase of the concentration of Brønsted sites was obtained. The fact that both the Lewis and Brønsted acidities markedly decrease between 423 and 623 K, proves that the available acid sites are overall weak. The pyridine desorption from the protonic sites is easier with CrNi(39)X than with Cr(39)X and Ni(40)X at 623 K, indicating a decrease in the strength in the case of ternary exchange.</div></front></TEI><affiliations><list><country><li>Algérie</li><li>France</li></country><region><li>Nouvelle-Aquitaine</li><li>Poitou-Charentes</li></region><settlement><li>Poitiers</li></settlement><orgName><li>Université de Poitiers</li></orgName></list><tree><country name="Algérie"><noRegion><name sortKey="Bendenia, Souhila" sort="Bendenia, Souhila" uniqKey="Bendenia S" first="Souhila" last="Bendenia">Souhila Bendenia</name></noRegion><name sortKey="Hammoudi, Habib" sort="Hammoudi, Habib" uniqKey="Hammoudi H" first="Habib" last="Hammoudi">Habib Hammoudi</name><name sortKey="Khelifa, Amine" sort="Khelifa, Amine" uniqKey="Khelifa A" first="Amine" last="Khelifa">Amine Khelifa</name><name sortKey="Marouf Khelifa, Kheira" sort="Marouf Khelifa, Kheira" uniqKey="Marouf Khelifa K" first="Kheira" last="Marouf-Khelifa">Kheira Marouf-Khelifa</name></country><country name="France"><region name="Nouvelle-Aquitaine"><name sortKey="Batonneau Gener, Isabelle" sort="Batonneau Gener, Isabelle" uniqKey="Batonneau Gener I" first="Isabelle" last="Batonneau-Gener">Isabelle Batonneau-Gener</name></region><name sortKey="Comparot, Jean Dominique" sort="Comparot, Jean Dominique" uniqKey="Comparot J" first="Jean-Dominique" last="Comparot">Jean-Dominique Comparot</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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