DC FieldValueLanguage
dc.contributor.authorParaskevopoulou, Patrina-
dc.contributor.authorGurikov, Pavel-
dc.contributor.authorRaptopoulos, Grigorios-
dc.contributor.authorChriti, Despoina-
dc.contributor.authorPapastergiou, Maria-
dc.contributor.authorKypritidou, Zacharenia-
dc.contributor.authorSkounakis, Vassilis-
dc.contributor.authorArgyraki, Ariadne-
dc.date.accessioned2019-06-19T12:26:57Z-
dc.date.available2019-06-19T12:26:57Z-
dc.date.issued2018-11-01-
dc.identifier.citationPolyhedron (154): 209-216 (2018-11-01)de_DE
dc.identifier.issn0277-5387de_DE
dc.identifier.urihttp://hdl.handle.net/11420/2804-
dc.description.abstractWe report the synthesis of W-doped biopolymer aerogels with potential applications to catalysis. The biopolymers were based on alginate, a cost-efficient natural material, and were prepared in environmentally friendly water/ethanol solutions. Gelation of alginate was induced by crosslinking with Ca2+. The resulting wet-gels were impregnated with an ethanolic solution of the ditungsten complex [W2(μ-OEt)2(OEt)2(EtOH)2Cl4] ({W = W}8+) and were dried with supercritical fluid (SCF) CO2 to yield W-doped alginate aerogels containing 10% w/w tungsten. Dry materials were characterized with FTIR, SEM/EDS, TGA, N2 porosimetry and He pycnometry. The bulk densities were low (<0.1 g cm−3), porosities were high (96% v/v), as well as the BET surface areas (380 m2/g). Pyrolysis of those aerogels at 800 °C under Ar yielded carbon along with a mixture of calcium tungstates, i.e., CaWO4 and Ca3WO6 (weight ratio: 70:30), while pyrolysis under O2 yielded the same tungstates, but with a different weight ratio (10:90). This can be a new process for Ca3WO6, which, due to its ordered double perovskite structure, is ideal for doping with metal ions, at relatively low temperature (800 °C versus >1000 °C in the literature).en
dc.language.isoende_DE
dc.relation.ispartofPolyhedronde_DE
dc.titleStrategies toward catalytic biopolymers: Incorporation of tungsten in alginate aerogelsde_DE
dc.typeArticlede_DE
dc.type.diniarticle-
dcterms.DCMITypeText-
tuhh.abstract.englishWe report the synthesis of W-doped biopolymer aerogels with potential applications to catalysis. The biopolymers were based on alginate, a cost-efficient natural material, and were prepared in environmentally friendly water/ethanol solutions. Gelation of alginate was induced by crosslinking with Ca2+. The resulting wet-gels were impregnated with an ethanolic solution of the ditungsten complex [W2(μ-OEt)2(OEt)2(EtOH)2Cl4] ({W = W}8+) and were dried with supercritical fluid (SCF) CO2 to yield W-doped alginate aerogels containing 10% w/w tungsten. Dry materials were characterized with FTIR, SEM/EDS, TGA, N2 porosimetry and He pycnometry. The bulk densities were low (<0.1 g cm−3), porosities were high (96% v/v), as well as the BET surface areas (380 m2/g). Pyrolysis of those aerogels at 800 °C under Ar yielded carbon along with a mixture of calcium tungstates, i.e., CaWO4 and Ca3WO6 (weight ratio: 70:30), while pyrolysis under O2 yielded the same tungstates, but with a different weight ratio (10:90). This can be a new process for Ca3WO6, which, due to its ordered double perovskite structure, is ideal for doping with metal ions, at relatively low temperature (800 °C versus >1000 °C in the literature).de_DE
tuhh.publisher.doi10.1016/j.poly.2018.07.051-
tuhh.publication.instituteThermische Verfahrenstechnik V-8de_DE
tuhh.type.opus(wissenschaftlicher) Artikel-
tuhh.institute.germanThermische Verfahrenstechnik V-8de
tuhh.institute.englishThermische Verfahrenstechnik V-8de_DE
tuhh.gvk.hasppnfalse-
dc.type.driverarticle-
dc.type.casraiJournal Article-
tuhh.container.volume154de_DE
tuhh.container.startpage209de_DE
tuhh.container.endpage216de_DE
item.creatorGNDParaskevopoulou, Patrina-
item.creatorGNDGurikov, Pavel-
item.creatorGNDRaptopoulos, Grigorios-
item.creatorGNDChriti, Despoina-
item.creatorGNDPapastergiou, Maria-
item.creatorGNDKypritidou, Zacharenia-
item.creatorGNDSkounakis, Vassilis-
item.creatorGNDArgyraki, Ariadne-
item.languageiso639-1en-
item.fulltextNo Fulltext-
item.cerifentitytypePublications-
item.openairetypeArticle-
item.openairecristypehttp://purl.org/coar/resource_type/c_6501-
item.grantfulltextnone-
item.creatorOrcidParaskevopoulou, Patrina-
item.creatorOrcidGurikov, Pavel-
item.creatorOrcidRaptopoulos, Grigorios-
item.creatorOrcidChriti, Despoina-
item.creatorOrcidPapastergiou, Maria-
item.creatorOrcidKypritidou, Zacharenia-
item.creatorOrcidSkounakis, Vassilis-
item.creatorOrcidArgyraki, Ariadne-
crisitem.author.deptEntwicklung und Modellierung neuartiger nanoporöser Materialien V-EXK2-
crisitem.author.orcid0000-0003-0598-243X-
crisitem.author.parentorgStudiendekanat Verfahrenstechnik-
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