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Magnetically modified nanogold-biosilica composite as an effective catalyst for CO oxidation
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SYSNO ASEP 0510770 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Magnetically modified nanogold-biosilica composite as an effective catalyst for CO oxidation Author(s) Holišová, V. (CZ)
Natšinová, M. (CZ)
Kratošová, G. (CZ)
Chromčáková, Ž. (CZ)
Schröfel, A. (CZ)
Vávra, I. (SK)
Životský, O. (CZ)
Šafařík, Ivo (BC-A) RID, ORCID
Obalová, L. (CZ)Source Title Arabian Journal of Chemistry . - : Elsevier - ISSN 1878-5352
Roč. 12, č. 7 (2019), s. 1148-1158Number of pages 11 s. Language eng - English Country SA - Saudi Arabia Keywords biosynthesis ; carbon monoxide ; catalysis ; ferrofluid ; nanogold-biosilica Subject RIV CA - Inorganic Chemistry OECD category Inorganic and nuclear chemistry R&D Projects LTC17020 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support BC-A - RVO:60077344 UT WOS 000494954400022 EID SCOPUS 85058363232 DOI 10.1016/j.arabjc.2018.12.002 Annotation The temperature-dependent biosynthesis of gold nanoparticles (AuNP) using diatom cells of Diadesmis gallica was successfully performed. The resulting biosynthesis product was a bionanocomposite containing AuNP (app. 20 nm) subsequently anchored on the silica surface of diatomaceous frustules. As-prepared nanogold-biosilica composite was tested as catalyst in the oxidation of carbon monoxide using gas chromatograph with thermal conductivity detector. For catalytic activity enhancement, bionanocomposite was magnetically modified by ferrofluid using two different methods, i.e., with and without the use of methanol. The oxidation of CO at 300 °C was 58–60% in the presence of nanogold-biosilica composites. CO conversion at 300 °C was only 15% over magnetically responsive sample modified in the presence of methanol. On the other hand, complete CO conversion was reached over direct (without methanol) magnetically modified nanogold-biosilica composite at 330 °C (GHSV = 60 l g−1 h−1). Our results show, that the type of magnetic modification can influence the catalytic activity of bionanocomposite. The best catalytic effect in CO conversion established direct magnetically modified nanogold-biosilica composite. Workplace Biology Centre (since 2006) Contact Dana Hypšová, eje@eje.cz, Tel.: 387 775 214 Year of Publishing 2020 Electronic address https://www.sciencedirect.com/science/article/pii/S1878535218302521?via%3Dihub
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