https://nova.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 The role of acid and metal sites in hydrodeoxygenation of guaiacol over Ni/Beta catalysts https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:40459 Wed 27 Jul 2022 11:43:27 AEST ]]> Mass transfer and kinetic study on BEA zeolite-catalysed oil hydroesterification https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47710 Wed 25 Jan 2023 10:48:36 AEDT ]]> In Situ XAFS Study of a Modified TS-1 Framework for Carbonyl Formation https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:42538 Wed 24 Aug 2022 16:04:24 AEST ]]> Role of metal support during ru-catalysed hydrodeoxygenation of biocrude oil https://nova.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 ]]> Formation of surface oxygen species and the conversion of methane to value-added products with N2O as Oxidant over Fe-Ferrierite Catalysts https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37281 2O over Fe-ferrierite (Fe-FER) catalyst prepared by solid-state ion-exchange method at moderate temperatures was studied using spectroscopic and solid characterization techniques including H2 temperature-programmed reduction (H2-TPR), N2O temperature-programmed desorption (N2O-TPD), and in situ Fourier transform infrared (FTIR). The utilization of active oxygen species for the direct conversion of methane to value-added products at moderate temperatures was investigated. The active oxygen sites for the selective conversion of methane were identified by a TPR feature at 220 °C. This site is also characterized by an infrared band observed at 1872 and 1892 cm-1 upon adsorption of NO. These bands are NO stretching vibrations of NO adsorbed on iron oxygen monomeric species, present in the zeolite cages and responsible for selective oxidation. We show that these oxidized species react with methane to form oxygenates but at higher temperatures form molecular oxygen. IR bands of surface methoxy groups were observed in significant concentration in the FTIR spectra and are suggested to be intermediate species of the selective oxidation of methane. Studies using continuous reactors demonstrated that cofeeding of methane and N2O-promoted generation of desired products from methane conversion by N2O over Fe-FER catalyst can be enhanced by optimizing the feed ratio of CH4/N2O. Furthermore, N2, O2 and NO were detected as the products of N2O decomposition over Fe-FER catalysts.]]> Wed 19 Jul 2023 10:27:37 AEST ]]> Formation of dioxin during smoldering of cca treated wood char https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:13404 Wed 11 Apr 2018 13:23:44 AEST ]]> Effect of Manganese on the selective catalytic hydrogenation of CO <inf>x</inf> in the presence of light hydrocarbons over Ni/Al2O3: an experimental and computational study https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:45435 2O3 catalyst for the hydrogenation of carbon oxides, in the presence of light hydrocarbons, was studied. Ni/Al2O3 displayed a high activity for the complete conversion of CO and CO2 to methane and C2+ hydrocarbons. Moreover, over a discrete and relatively narrow temperature range, the net concentration of light C2+ hydrocarbons was elevated, with the exit stream containing a higher concentration of C2+ species than was present in the feed stream and the product stream being virtually free of carbon oxides. It is found that the addition of manganese can enhance the selectivity toward the production of light hydrocarbons. A series of Ni–Mn/Al2O3 catalysts, prepared with different Ni/Mn ratios, were studied. Various characterization techniques such as X-ray diffraction (XRD) analysis, CO and H2 chemisorption, in situ nitric oxide adsorption Fourier transform infrared spectroscopy (NO-FTIR), and temperature-programmed reduction (TPR) were performed to gain an insight into how the addition of Mn to the primary catalyst enhances the yield of light hydrocarbons. The origin of Mn promotion was demonstrated through density functional theory (DFT) calculations, which revealed the favorable Mn substitution at the Ni(211) step edge sites under reducing conditions. The affinity of these Mn species toward oxidation stabilizes the CO dissociation product and thus provides a thermodynamic driving force that promotes C–O bond cleavage compared to the Mn-unmodified catalyst surface.]]> Wed 07 Feb 2024 15:34:43 AEDT ]]> Novel hierarchical core-shell BEA@NanoZSM-5 zeolite for improved cracking performance for 1,3,5-triisopropylbenzene and n-hexadecane https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:43978 Wed 05 Oct 2022 14:29:44 AEDT ]]> An experimental investigation on the effects of adding a transition metal to Ni/Al₂O₃ for catalytic hydrogenation of CO and CO₂ in presence of light alkanes and alkenes https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:36086 Wed 05 Feb 2020 14:51:11 AEDT ]]> Separation and analysis of high range extractable molecules formed during coal pyrolysis using coupled thin layer chromatography-imaging mass spectrometry (TLC-LDI-IMS) https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:34543 Tue 26 Mar 2019 13:54:09 AEDT ]]> Shape selectivity of zeolite catalysts for the hydrodeoxygenation of biocrude oil and its model compounds https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47138 Tue 14 Nov 2023 11:38:41 AEDT ]]> Highly-dispersed Ni on BEA catalyst prepared by ion-exchange-deposition-precipitation for improved hydrodeoxygenation activity https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:40121 2-TPD and H2-FTIR. IDP catalyst displays a higher metal dispersion and higher concentration of nickel hydrides than impregnated and DP catalysts, while bigger Ni nanoparticles formed in impregnated catalysts exhibit a higher concentration of nickel hydrides per surface Ni. The guaiacol conversion was not significantly affected by the catalyst preparation method, while the product selectivity was altered. Higher cyclohexane formation rate was detected over IDP catalysts compared to DP and impregnated catalysts. Besides, cyclohexane formation rate displays a positive linear correlation with the concentration of nickel hydrides, suggesting nickel hydrides play a crucial role in the hydrodeoxygenation reaction.]]> Tue 05 Jul 2022 13:57:40 AEST ]]> Natural zeolite supported Ni catalysts for hydrodeoxygenation of anisole https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:43843 Tue 04 Oct 2022 11:46:23 AEDT ]]> Effect of Desilication On the Catalytic Activity of Fe-FER For Direct, Selective, Partial Oxidation of Methane https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50501 Thu 27 Jul 2023 12:28:40 AEST ]]> Study on Catalyst Deactivation During the Hydrodeoxygenation of Model Compounds https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:40849 Thu 21 Jul 2022 15:35:13 AEST ]]> Methane oxidation by N₂O over Fe-FER catalysts prepared by different methods: nature of active iron species, stability of surface oxygen species and selectivity to products https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:46380 Thu 17 Nov 2022 13:38:16 AEDT ]]> Comparison of direct, selective oxidation of methane by N₂O over Fe-ZSM-5, Fe-Beta, and Fe-FER catalysts 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 ]]> Process for Chloroform Decomposition: Nonthermal Plasma Polymerization with Methane and Hydrogen https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:41250 Sat 30 Jul 2022 12:40:37 AEST ]]> Three-dimensional numerical study on flames https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:7923 Sat 24 Mar 2018 08:41:39 AEDT ]]> Inhibition of premixed methane-air flames with CF₃I https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:8015 Sat 24 Mar 2018 08:36:49 AEDT ]]> Reaction of carbon tetrachloride with methane in a non-equilibrium plasma at atmospheric pressure, and characterisation of the polymer thus formed https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:17485 Sat 24 Mar 2018 08:04:07 AEDT ]]> Non-oxidative conversion of 1,2-dichloroethane in a non-thermal plasma and characterisation of the polymer formed https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:20097 Sat 24 Mar 2018 08:00:05 AEDT ]]> Oxidative coupling and hydroxylation of phenol over transition metal and acidic zeolites: insights into catalyst function https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:21372 Sat 24 Mar 2018 07:51:26 AEDT ]]> Maceral separation from coal by the Reflux Classifier https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:29707 Sat 24 Mar 2018 07:33:26 AEDT ]]> The use of LDI-TOF imaging mass spectroscopy to study heated coal with a temperature gradient incorporating the plastic layer and semi-coke https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:29503 Sat 24 Mar 2018 07:29:45 AEDT ]]> The effect of synthesis gas composition on the performance of Ni-based solid oxide fuel cells https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:26398 Sat 24 Mar 2018 07:28:01 AEDT ]]> Reaction of dichloromethane under non-oxidative conditions in a dielectric barrier discharge reactor and characterisation of the resultant polymer https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:30034 Sat 24 Mar 2018 07:24:20 AEDT ]]> Influence of impurities on the epoxidation of allyl alcohol to glycidol with hydrogen peroxide over titanium silicate TS-1 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:24114 Sat 24 Mar 2018 07:11:41 AEDT ]]> Catalytic conversion of glycerol to polymers in the presence of ammonia https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:24563 Sat 24 Mar 2018 07:11:32 AEDT ]]> Hydrodeoxygenation of oleic acid for effective diesel-like hydrocarbon production using zeolite-based catalysts https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39743 Mon 29 Jan 2024 18:49:33 AEDT ]]> Understanding catalysis for processing glycerol and glycerol-based derivatives for the production of value added chemicals https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:49155 Mon 29 Jan 2024 17:44:58 AEDT ]]> The effect of synthesis gas on the performance of Ni-based solid oxide fuel cells https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:18680 Mon 20 Jul 2015 17:34:21 AEST ]]> In-situ FTIR study on the mechanism of both steps of zeolite-catalysed hydroesterification reaction in the context of biodiesel manufacturing https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:45564 Mon 07 Nov 2022 12:03:56 AEDT ]]> Hydrodeoxygenation of guiacol over ion-exchanged ruthenium ZSM-5 and BEA zeolites https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39234 4+ cations in zeolites with Ru3+ ions, are employed for the hydrodeoxygenation of guaiacol. The performance results indicate ion-exchanged Ru zeolites, with extremely low Ru contents (~0.2 wt%), possess a high intrinsic HDO activity compared to the catalysts prepared by the incipient wetness impregnation method. On the basis of TEM, FTIR, XPS and TPD analysis, the NH4+ ions in zeolite were substituted by Ru species, with metal particles entered the zeolite cages and finely dispersed on the support. These ion-exchanged Ru particles exhibit a strong electronic interaction with oxygen atoms of zeolite framework with a mixed Ru(0)-Ru(III) species observed in the reduced samples. In contrast, only Ru0 was detected in the reduced impregnated Ru/ZSM-5. The partial-reduced Ru species over the ion-exchanged Ru/ZSM-5 catalyst shows a high H2 adsorption activity facilitating the hydrogenation of guaiacol to the saturated products (such as 2-methoxycyclohexanol). In addition, ion-exchanged Ru-ZSM-5 and Ru-BEA catalysts present a similar normalized cyclohexane formation rate (based on the concentration of acid sites), suggesting the acid sites play a pivotal role in the deoxygenation of 2-methoxycyclohexanol to cyclohexane.]]> Fri 27 May 2022 13:36:26 AEST ]]> Hydroesterification of bio-oils over HZSM-5, BETA and Y zeolites https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:46581 Fri 25 Nov 2022 13:47:01 AEDT ]]> Hydrodeoxygenation of guaiacol over BEA supported bimetallic Ni-Fe catalysts with varied impregnation sequence https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39742 Fri 17 Jun 2022 18:27:05 AEST ]]>