https://ogma.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:38517 2O₃ (possessing weak acid sites, 9.2 nm) and Ru/SiO₂ (absence of acid sites, 15.2 nm) were also prepared and examined. It was observed that a decrease in the Si/Al ratio of the support results in an increase in the yield of cyclohexane and a decrease in the yield of 2-methoxycyclohexanol in HDO of guaiacol. This data also discloses the influence of the concentration of acid sites on the deoxygenation of 2-methoxycyclohexanol. Both Ru/BEA and Ru/ZSM-5, with both possessing low Si/Al ratios, display a high activity for HDO for guaiacol, while only the Ru/BEA catalyst exhibits a high activity for HDO of biocrude oil. Catalyst characterisation (BET, NH₃-TPD and NH₃ and acetonitrile-d3-FTIR) shows that the Ru/BEA catalyst, with a low Si/Al ratio, not only possesses strong Brønsted acid sites but also contains extensive mesoporosity. Notably, these mesopores appear to facilitate the hydrogenation, deoxygenation, and ring-opening of large oxygenated and condensed-ring hydrocarbons in biocrude oil which then leads to a high yield of cycloalkanes. As expected, the Ru/Al₂O₃ and Ru/SiO₂ catalysts exhibit a high hydrogenation activity but a lower deoxygenation activity in the HDO of guaiacol and biocrude oil. These results suggest that the larger pore support, with strong Brønsted acid sites, engendered the HDO activity observed. The reaction pathway for the main components of biocrude oil was proposed based on the observed reaction product distribution.]]> Wed 20 Oct 2021 11:28:59 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:24586 Wed 11 Apr 2018 17:14:09 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:15000 Wed 11 Apr 2018 11:22:30 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:37789 Tue 20 Apr 2021 15:22:33 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:40870 Tue 19 Jul 2022 14:17:29 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47076 Tue 13 Dec 2022 16:21:23 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:43843 Tue 04 Oct 2022 11:46:23 AEDT ]]> https://ogma.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://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:21372 Sat 24 Mar 2018 07:51:26 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36398 Mon 04 May 2020 13:53:00 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36381 2 , which was attributed to the high reactivity and stability of isolated single Co atoms. Our findings open up a new avenue to regulate the metal particle size and catalytic performance of MOF derivatives.]]> Fri 03 Apr 2020 16:59:31 AEDT ]]>