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dc.creatorHolclajtner-Antunović, Ivanka
dc.creatorUskoković-Marković, Snežana
dc.creatorPopa, Alexandru
dc.creatorJevremović, A
dc.creatorNedić-Vasiljević, Bojana
dc.creatorMilojević-Rakić, Maja
dc.creatorBajuk-Bogdanović, Danica
dc.date.accessioned2019-09-02T12:09:25Z
dc.date.available2019-09-02T12:09:25Z
dc.date.issued2019
dc.identifier.issn1878-5190
dc.identifier.urihttps://farfar.pharmacy.bg.ac.rs/handle/123456789/3280
dc.description.abstractThe current study reports the synthesis, characterization and catalytic activity of tungstophosphoric acid (HPW) and its potassium salts (KH2PW and K3PW) supported on activated carbon (AC). Because potassium salts of tungstophosphoric acid are insoluble, the carbon supported KH2PW and K3PW were prepared by a two step impregnation method. The synthesized catalysts were characterized by various physicochemical methods such as Fourier transform infrared and Raman spectroscopy, differential thermal analysis, thermogravimetric analysis, X-ray diffraction, scanning electron microscopy and nitrogen physisorption. It is observed that all active phases keep their Keggin-type structure after being supported on AC, while their specific surface area is considerably increased by deposition on this porous substrate. The results also indicated that the synthesized materials retained the morphology specific for the support as well as its thermal properties. The adsorption behaviour of the nanocomposites towards nicosulfuron pesticide was found to be particulary good and even slightly improved when compared to pure activated carbon. The catalytic activity of the prepared catalysts was probed for the vapor phase dehydration of ethanol at 300 °C. The conversion of ethanol and selectivity toward ethylene and diethyl ether of nanocomposites were compared with the values of bare HPW, KH2PW and K3PW. Results revealed that catalytic activity depends on the catalyst type and active phase loading. The conversion over unsupported catalysts decreased by increasing the cation content per Keggin unit. The nanocomposites with 30 wt% loading of HPW achieved the best conversion of nearly 100% and the highest and stable selectivity toward ethylene. The catalytic activity of nanocomposites with acidic KH2PW showed lower catalytic activity of about 70%, while the nanocomposites of neutral K3PW and AC showed negligible activity.en
dc.publisherSpringer Netherlands
dc.relationinfo:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/172043/RS//
dc.rightsrestrictedAccess
dc.sourceRecords of Natural Products
dc.subjectAcidityen
dc.subjectActivated carbonen
dc.subjectEthanol dehydrationen
dc.subjectImpregnation methoden
dc.subjectSurface areaen
dc.subjectTungstophosphoric aciden
dc.titleEthanol dehydration over Keggin type tungstophosphoric acid and its potassium salts supported on carbonen
dc.typearticle
dc.rights.licenseARR
dcterms.abstractХолцлајтнер-Aнтуновић, Иванка; Недић-Васиљевић, Бојана; Бајук-Богдановић, Даница; Ускоковић-Марковић, Снежана; Попа, Aлеxандру; Милојевић-Ракић, Маја; Јевремовић, A;
dc.citation.rankM23
dc.identifier.wos000486027900008
dc.identifier.doi10.1007/s11144-019-01625-6
dc.identifier.scopus2-s2.0-85068187891
dc.identifier.rcubconv_4595
dc.type.versionpublishedVersion


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