20.500.12556/DKUM-80776 Analiza površinske kislosti in hidroksilacije magnetno izločitvenega bemita in γ-alumine s FTIR spektroskopijo magistrsko delo Analysis of surface acidity and hydroxylation of the magnetically separable boehmite and γ-alumina by FTIR spectroscopy V naši raziskovalni nalogi smo analizirali infrardeče spektre adsorbiranega piridina na kisle površine v območju 1700 in 1400 cm-1. Spekter koordinacijsko vezanega piridina je drugačen, kot je spekter piridinijevega iona, kar nam omogoča razlikovanje kislih mest na površini. Z opazovanjem temperaturne obstojnosti vrhov in njihovih premikov smo na grobo ocenili moč kislih mest. Primerjali smo različne vzorce: bohemit z nanodelci magnetnega železovega oksida, alumina z nanodelci magnetnega železovega oksida, pripravljena v cevni peči in hranjena na zraku, alumina z nanodelci železovega oksida, pripravljena in-situ v peči IR spektrometra in komercialnega alumina. Pri vseh materialih so bila dokazana Lewisova kisla mesta in odsotnost Brønstedovih kislih mest. Ugotovljeno je bilo, da nasičene površine z vlago in dodatek nanodelcev železovega oksida nimajo znatnega vpliva na jakost Lewisowih kislih mest. In our research we analysed infrared spectrum in the 1400 to 1700 cm-1 region for pyridine adsorbed on acidic solids. The spectrum of pyridine coordinately bonded is different from that of the pyridinium ion, which allows us to distinguish acidic sites on the surface. By observing the relative retention of the band with temperature and shift of the bands we roughly estimated the strength of the acid sites. We compared different samples: bohemite with magnetic iron oxide nanoparticles, alumina with magnetic iron oxide nanoparticles prepared in a tube furnace and stored in air, alumina with iron oxide nanoparticles prepared in-situ in an IR spectrometer furnace and last commercial alumina. For all materials Lewis acid sites and the absence Brønsted acid sites were demonstrated. It was found that saturated surfaces with moisture and the addition of iron oxide nanoparticles do not have a significant effect on the strength of Lewis acid sites. površinska kislost hidroksilacija bohemit γ-alumine surface acidity hidroxylation boehmite γ-alumina true true false [L. Suhodolčan] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2021-10-12 00:35:00 2021-11-05 12:41:38 2022-08-09 23:56:02 0000-00-00 00:00:00 2021 0 Maribor 0 Maribor X, 55 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 544.361.5+66.094.32(043.2) 88301059 MAG_Suhodolcan_Larisa_2021.pdf MAG_Suhodolcan_Larisa_2021.pdf 1 81C4E881D65B52267D57BF73A5BACBEF 81583a4a1c7af76a2a2ad9a2e29431bba124777ea550bb10f3daed3cdad1ddeb eee6f250-3cdf-11ec-83ff-00155d000105 20.500.12556/dkum/e8d6141f-03e2-4b94-990c-e66332b6b1e4 https://dk.um.si/Dokument.php?lang=slv&id=155269 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0