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Chemical control of the characteristics of Mo-doped carbon xerogels by surfactant-mediated synthesis
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SYSNO ASEP 0386057 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Chemical control of the characteristics of Mo-doped carbon xerogels by surfactant-mediated synthesis Tvůrce(i) Maldonado-Hódar, F. J. (ES)
Jirglová, Hana (UFCH-W) RID, ORCID
Pérez-Cadenas, A. F. (ES)
Morales-Torres, S. (ES)Zdroj.dok. Carbon. - : Elsevier - ISSN 0008-6223
Roč. 51, JAN 2013 (2013), s. 213-223Poč.str. 11 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova synthesis ; molybdenum ; carbon xerogels Vědní obor RIV CF - Fyzikální chemie a teoretická chemie Institucionální podpora UFCH-W - RVO:61388955 UT WOS 000311005300024 EID SCOPUS 84868148603 DOI 10.1016/j.carbon.2012.08.046 Anotace Carbon xerogels doped with Mo were prepared by a sol–gel modified method for the resorcinol (R) – formaldehyde (F) polymerization (RF-gels). The use of surfactants (S) yields composites (RFS-gels), the S molecules are incorporated to the gel structure generating different metal anchoring sites. The interaction of molybdate ions View the MathML source with RF and RFS-gels was analysed. The View the MathML source adsorption is favoured by the attractive interactions with the RFS-gel containing a cationic surfactant, and by the presence of oxygenated chemical groups introduced by the non-ionic surfactant. The smallest Mo-loading was obtained in RFS-gels containing anionic surfactant as a consequence of repulsive interactions. The adsorbed Mo-species influence on the curing of the polymeric gels, inducing a larger shrinkage and a lower microporosity of the carbon xerogels. The dispersion and chemical nature of Mo particles depend also on the Mo-gel interactions. Stronger attractive interactions avoid sintering in some extent and favour the reduction of the molybdate with formation of a mixture of α-Mo2C and MoO3, while MoO3 particles were only found in RF-Mo or anionic RFS-Mo carbon xerogels. Only propene was obtained as product of the isopropanol decomposition showing the acid character of these catalysts. The catalytic activity is correlated to the proportion of Mo2C formed in each sample. Pracoviště Ústav fyzikální chemie J.Heyrovského Kontakt Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Rok sběru 2014
Počet záznamů: 1