Controlling ZIF-8 nano- and microcrystal formation and reactivity through zinc salt variations
Identifieur interne : 000371 ( Main/Exploration ); précédent : 000370; suivant : 000372Controlling ZIF-8 nano- and microcrystal formation and reactivity through zinc salt variations
Auteurs : Aleksandra Schejn [France] ; Lavinia Balan [France] ; Véronique Falk [France] ; Lionel Aranda [France] ; Ghouti Medjahdi [France] ; Raphaël Schneider [France]Source :
English descriptors
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Abstract
We report here a simple method for controlling the crystal size and morphology of zeolitic imidazolate framework-8 (ZIF-8) nanocrystals in methanol solution. ZIF-8 crystals were prepared by mixing 2-methylimidazole (Hmim) with various zinc salts for 1 h and using a Hmim/Zn(+2) salt molar ratio of 8/1. All products prepared were assigned to a sodalite-type structure and both particle size and morphology were found to be dependent on the reactivity of the Zn(+2) salt. Small ZIF-8 crystals with diameters varying between ca. 50 and 200 nm were obtained with reactive zinc salts like Zn(acac)2, Zn(NO3)2, ZnSO4 or Zn(ClO4)2 as demonstrated by SEM, TEM and DLS analyses. The use of ZnCl2, Zn(OAc)2 or ZnI2 afforded crystals with sizes varying between ca. 350 and 650 nm. Finally, the low reactive ZnBr2 salt was found to generate microsized crystals. Taking ZIF-8 crystals prepared from Zn(NO3)2, Zn(OAc)2 and ZnBr2 as representatives and through thermogravimetric analysis and BET measurements, we also demonstrated that changes in particle size induced changes in stability and adsorption properties. The small sized ZIF-8 crystals produced from Zn(NO3)2 were found to exhibit the highest surface area (1700 m2 g−1) and the best catalytic activity in Knoevenagel and Friedländer reactions.
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DOI: 10.1039/C3CE42485E
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Le document en format XML
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CS 25233 - 54052 Nancy cedex</addrLine><country key="FR"></country></address><ref type="url">http://www.univ-lorraine.fr/</ref></desc></org></tutelle><tutelle name="UMR7198" active="#struct-441569" type="direct"><org type="institution" xml:id="struct-441569" status="VALID"><idno type="ISNI">0000000122597504</idno><idno type="IdRef">02636817X</idno><orgName>Centre National de la Recherche Scientifique</orgName><orgName type="acronym">CNRS</orgName><date type="start">1939-10-19</date><desc><address><country key="FR"></country></address><ref type="url">http://www.cnrs.fr/</ref></desc></org></tutelle></tutelles></hal:affiliation><country>France</country><placeName><settlement type="city">Nancy</settlement><settlement type="city">Metz</settlement><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Lorraine (région)</region></placeName><orgName type="university">Université de Lorraine</orgName></affiliation></author><author><name sortKey="Schneider, Raphael" sort="Schneider, Raphael" uniqKey="Schneider R" first="Raphaël" last="Schneider">Raphaël Schneider</name><affiliation wicri:level="1"><hal:affiliation type="laboratory" xml:id="struct-211875" status="VALID"><idno type="IdRef">153068876</idno><idno type="RNSR">201320573K</idno><idno type="IdUnivLorraine">[UL]RQC--</idno><orgName>Laboratoire Réactions et Génie des Procédés</orgName><orgName type="acronym">LRGP</orgName><date type="start">2013-01-01</date><desc><address><addrLine>Université de Lorraine - ENSIC, 1 rue de Grandville BP 20451, 54001 Nancy Cedex</addrLine><country key="FR"></country></address><ref type="url">http://lrgp.univ-lorraine.fr/</ref></desc><listRelation><relation active="#struct-413289" type="direct"></relation><relation name="UMR7274" active="#struct-441569" type="direct"></relation></listRelation><tutelles><tutelle active="#struct-413289" type="direct"><org type="institution" xml:id="struct-413289" status="VALID"><idno type="IdRef">157040569</idno><idno type="IdUnivLorraine">[UL]100--</idno><orgName>Université de Lorraine</orgName><orgName type="acronym">UL</orgName><date type="start">2012-01-01</date><desc><address><addrLine>34 cours Léopold - CS 25233 - 54052 Nancy cedex</addrLine><country key="FR"></country></address><ref type="url">http://www.univ-lorraine.fr/</ref></desc></org></tutelle><tutelle name="UMR7274" active="#struct-441569" type="direct"><org type="institution" xml:id="struct-441569" status="VALID"><idno type="ISNI">0000000122597504</idno><idno type="IdRef">02636817X</idno><orgName>Centre National de la Recherche Scientifique</orgName><orgName type="acronym">CNRS</orgName><date type="start">1939-10-19</date><desc><address><country key="FR"></country></address><ref type="url">http://www.cnrs.fr/</ref></desc></org></tutelle></tutelles></hal:affiliation><country>France</country><placeName><settlement type="city">Nancy</settlement><settlement type="city">Metz</settlement><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Lorraine (région)</region></placeName><orgName type="university">Université de Lorraine</orgName></affiliation></author></analytic><idno type="DOI">10.1039/C3CE42485E</idno></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="mix" xml:lang="en"><term>MOFs</term><term>ZIF-8</term><term>adsorption</term><term>catalysis</term><term>particle size</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We report here a simple method for controlling the crystal size and morphology of zeolitic imidazolate framework-8 (ZIF-8) nanocrystals in methanol solution. ZIF-8 crystals were prepared by mixing 2-methylimidazole (Hmim) with various zinc salts for 1 h and using a Hmim/Zn(+2) salt molar ratio of 8/1. All products prepared were assigned to a sodalite-type structure and both particle size and morphology were found to be dependent on the reactivity of the Zn(+2) salt. Small ZIF-8 crystals with diameters varying between ca. 50 and 200 nm were obtained with reactive zinc salts like Zn(acac)2, Zn(NO3)2, ZnSO4 or Zn(ClO4)2 as demonstrated by SEM, TEM and DLS analyses. The use of ZnCl2, Zn(OAc)2 or ZnI2 afforded crystals with sizes varying between ca. 350 and 650 nm. Finally, the low reactive ZnBr2 salt was found to generate microsized crystals. Taking ZIF-8 crystals prepared from Zn(NO3)2, Zn(OAc)2 and ZnBr2 as representatives and through thermogravimetric analysis and BET measurements, we also demonstrated that changes in particle size induced changes in stability and adsorption properties. The small sized ZIF-8 crystals produced from Zn(NO3)2 were found to exhibit the highest surface area (1700 m2 g−1) and the best catalytic activity in Knoevenagel and Friedländer reactions.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Grand Est</li><li>Lorraine (région)</li></region><settlement><li>Metz</li><li>Nancy</li></settlement><orgName><li>Université de Lorraine</li></orgName></list><tree><country name="France"><region name="Grand Est"><name sortKey="Schejn, Aleksandra" sort="Schejn, Aleksandra" uniqKey="Schejn A" first="Aleksandra" last="Schejn">Aleksandra Schejn</name></region><name sortKey="Aranda, Lionel" sort="Aranda, Lionel" uniqKey="Aranda L" first="Lionel" last="Aranda">Lionel Aranda</name><name sortKey="Balan, Lavinia" sort="Balan, Lavinia" uniqKey="Balan L" first="Lavinia" last="Balan">Lavinia Balan</name><name sortKey="Falk, Veronique" sort="Falk, Veronique" uniqKey="Falk V" first="Véronique" last="Falk">Véronique Falk</name><name sortKey="Medjahdi, Ghouti" sort="Medjahdi, Ghouti" uniqKey="Medjahdi G" first="Ghouti" last="Medjahdi">Ghouti Medjahdi</name><name sortKey="Schneider, Raphael" sort="Schneider, Raphael" uniqKey="Schneider R" first="Raphaël" last="Schneider">Raphaël Schneider</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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