20.500.12556/RUL-153558 Synthesis of Pt decorated manganese oxide (▫${\rm MnO}_2/{\rm Mn}_5{\rm O}_8$▫) nanorods and their catalytic activity for the reduction of 4-nitrophenol to 4-aminophenol α-MnO2 nanorods (NRs) were synthesized by microwave irradiation and used as supports for platinum nanoparticles by wet impregnation with Pt(acac)2 as precursor. XRD analysis revealed that the samples without platinum (sample MP0) and with 1 % platinum (sample MP1) contained tetragonal α-MnO2. Samples with 3 % (sample MP3) and 5 % (sample MP5) of platinum contained monoclinic Mn5O8 in addition to α-MnO2, with Mn5O8 dominating in sample MP5. Rietveld analysis showed that the lattice parameters of α-MnO2 increased slightly with Pt loading. SEM and STEM showed that higher Pt loadings resulted in shorter nanorods and different sizes and dispersions of PtNPs on their surface. XPS results showed a decrease in Pt(IV) and Pt(II) concentration with Pt loading, while Pt(0) increased. NEXAFS results showed the presence of Mn(II) in MP3 and MP5, which is consistent with XRD results detecting Mn5O8. The catalytic activity of the Pt/α-MnO2 nanorods was tested in the catalytic reduction of 4-nitrophenol to 4-aminophenol. MP1, with the lowest platinum content, exhibited the highest mass normalized rate constant kapp/mPt of 1.8 × 104 s−1 g−1. The study suggests that the presence of Pt(IV) is not a limiting factor for the catalytic reduction of 4-NP to 4-AP. manganese oxides microwave synthesis platinum reducible supports wet-impregnation 4-nitrophenol reduction manganovi oksidi mikrovalovna sinteza platina reducibilni nosilci mokra impregnacija redukcija 4-nitrofenola true false true Angleški jezik Slovenski jezik Članek v reviji 2024-01-15 14:39:21 2024-01-15 14:39:22 2024-01-16 03:41:24 0000-00-00 00:00:00 2024 0 0 12 str. Vol. 649, art. 159091 Mar. 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 544 1873-5584 10.1016/j.apsusc.2023.159091 180932611 1-s2.0-S016943322302771X-main.pdf 1-s2.0-S016943322302771X-main.pdf 1 5E4F9C2667B6C00A9ECF0488C35C0224 2aee5ecd63cd785504189cc97912b5a930aacc9982602f8bbd854fa39df63ca1 d4acab22-b3ab-11ee-88ef-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=179616 https://www.sciencedirect.com/science/article/pii/S016943322302771X 1 7e225212-b3ab-11ee-88ef-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=179615 Zdravstvena fakulteta 0 0 0