https://nova.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:40459 Wed 27 Jul 2022 11:43:27 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:11552 Wed 11 Apr 2018 14:55:54 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:22054 Wed 11 Apr 2018 11:47:42 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:34989 Wed 09 Jun 2021 16:04:03 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47177 Tue 21 Mar 2023 18:09:43 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39065 2 were screened as co-catalyst components for Fe₂O₃/attapulgite (ATP) catalyst, and three new catalysts (CuO-Fe₂O₃/ATP, CeO₂-Fe₂O₃/ATP and CuO-CeO₂-Fe₂O₃/ATP) were prepared for degradation of methylene blue (MB). The three catalysts' characteristics were determined by BET, XRD, FT-IR, SEM and XPS. MB degradation in different systems and at different pH values was also studied. Under the conditions of H₂O₂ concentration of 4.9 mmol L^-1, catalyst dosage of 5 g L^-1, pH of 5, reaction temperature of 60 ℃ and MB initial concentration of 100 mg L^-1, the as-synthesized catalysts showed much greater reaction rate and degradation efficiency of MB than Fe₂O₃/ATP catalyst. In addition, the reusability of the as-prepared composites was evaluated. The intermediate products of MB degradation were identified by LC-MS and the possible degradation process of MB was put forward.]]> Tue 03 May 2022 11:59:40 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:43325 Thu 15 Sep 2022 14:43:46 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37767 2O as oxidant. Spectroscopic and solid characterization tools including H₂-TPR, in situ IR, N₂ gas adsorption, CO chemisorption, and TGA-MS were used in the investigation. Ammonia adsorption data suggested that among the studied zeolites, H-FER zeolite contained the highest concentration of framework Al atoms, which are essential for the formation of active extra-framework Fe species. The oxidation state and redox active species of Fe-ZSM-5, Fe-Beta, and Fe-FER catalysts were studied by H₂-TPR, which disclosed the presence of a unique reduction peak (originating from N₂O pretreatment) centered at approximately 235 °C over the samples. The hydrogen consumption peak was more prominent over Fe-FER than other catalysts, demonstrating that the Fe-FER catalyst contained more active sites for N₂O conversion in comparison to Fe-Beta and Fe-ZSM-5 catalysts. For IR spectra of NO adsorbed on the Fe zeolites, a band at 1874 cm^–1 with a shoulder at 1894 cm^–1 was observed over the three catalysts, suggesting the presence of extra-framework Fe clusters in ion exchange positions. We demonstrated these clusters are acting as active sites for the oxidation of methane with N₂O. Bands of methoxy groups were observed in FTIR profiles of CH4 and N₂O adsorbed on Fe-FER, Fe-ZSM-5, and Fe-Beta catalysts at 350 °C. Over Fe-FER, the concentration of silanol-bonded methoxy groups accounted for over 95% of all methoxy groups under all the reaction conditions studied. In comparison, for the Fe-ZSM-5 and Fe-Beta catalysts, the proportion was less than 80%. The catalytic activity studies showed that Fe-FER was the most active catalyst based on methane and N₂O conversion, and displayed the highest selectivity to C₁-oxygenates and dimethyl ether formation, while Fe-ZSM-5 obtained the highest selectivity to ethylene among the three catalysts. Fe-ZSM-5 was found to deactivate significantly due to coke formation.]]> Thu 15 Apr 2021 10:03:06 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:49214 Sun 07 May 2023 09:37:16 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:11961 Sat 24 Mar 2018 10:32:24 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:17054 Sat 24 Mar 2018 08:02:11 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:48716 Mon 29 Jan 2024 18:47:51 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47359 Mon 29 Jan 2024 18:35:13 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47208 Mon 29 Jan 2024 17:45:48 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50393 Mon 24 Jul 2023 14:54:09 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:36649 2O production being assumed to accompany the formation of BN during BOCVD, we do not observe Ni-catalyzed evolution of H₂O, although significant amounts of H₂ is evident. At low oxygen chemical potentials, defect-free BN ring networks are produced following the oligomerization of BN chain structures and the Ni-catalyzed cleavage of homoelemental B-B and N-N bonds. The BNNT tip structures align perpendicular to the surface via the direct fusion of adjacent BN ring networks via a mechanism that is a stark departure from that observed for carbon nanotube nucleation.]]> Mon 22 Jun 2020 14:38:29 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47973 Mon 13 Feb 2023 16:12:53 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:29491 Fri 28 Jun 2019 11:53:08 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:40041 2. The influence of the concentrations of NO and O₂ on the oxidation of NO was investigated. Besides, the changes in the reaction rate with the particle size of the catalysts were investigated to determine the internal diffusion resistance. The surface area and microcrystalline structure of the catalysts were analyzed to investigate the impact of physical structure on SO₂ poisoning in the catalyst. It was observed that Co doping in Mn/TiO₂ had a favorable impact on reducing the effect of SO₂ poisoning during the NO oxidation reaction. On the basis of the kinetic study, it was concluded that the reaction followed the Langmuir−Hinshelwood (L-H) mechanism, where NO and O₂ were adsorbed on the catalyst, forming highly reactive NO⁺ and O⁻, which were then converted into NO₂. The Co doping into the TiO₂ crystal lattice increased the O₂ adsorption, thus accelerating the rate of NO oxidation reaction.]]> Fri 22 Jul 2022 13:14:04 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:51718 Fri 15 Sep 2023 17:54:41 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:46095 Fri 11 Nov 2022 11:03:01 AEDT ]]>