https://novaprd-lb.newcastle.edu.au/vital/access/manager/Index ${session.getAttribute("locale")} 5 https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:13407 Wed 11 Apr 2018 15:01:06 AEST ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:13193 2 (¹∆) whose formation is catalysed by the reactor surfaces, initiates the reaction at this low temperature. Quantum chemical computations of the reaction potential energy surfaces suggest low energy pathways to the observed initial products.]]> Wed 11 Apr 2018 13:51:15 AEST ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:13194 Wed 11 Apr 2018 13:35:06 AEST ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:9026 Wed 11 Apr 2018 13:34:25 AEST ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:13405 Wed 11 Apr 2018 13:26:13 AEST ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:13406 Wed 11 Apr 2018 12:25:47 AEST ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:13190 2). In this study, reaction rate constants are derived for H abstraction by H0₂ from the three distinct locations of H in ethylbenzene (primary, secondary and aromatic H, with H on the ortho carbon taken as an example of unreactive aromatic H) as well as for the addition of H at the four possible sites. Rate constants are provided in the simple Arrhenius form. The dominant channel at all temperatures is found to be H abstraction from the secondary C-H bonds of the ethyl chain, whereas abstractions from the primary C-H bonds also contribute significantly at higher temperatures. Reasonable agreement was obtained with the limited literature data. Addition at the four sites of the aromatic ring and abstraction of one of the C-H aromatic bonds are rather unimportant for all temperatures. The results presented herein should be useful in modeling the lower temperature oxidation of alkylbenzenes.]]> Wed 11 Apr 2018 11:55:59 AEST ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:9032 Wed 11 Apr 2018 11:20:03 AEST ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:9027 Wed 11 Apr 2018 10:29:17 AEST ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:13195 37Cl on the heat of formation of a series of polychlorinated phenols.]]> Wed 11 Apr 2018 10:19:32 AEST ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:9034 Wed 11 Apr 2018 09:19:45 AEST ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:35220 in operando grinding technique which does not require feedstocks which have been subjected to prior ultrafine grinding nor heat-activation. Concurrent grinding is shown to result in a significant increase in magnesite yields for non-heat activated feedstock, prepared such that fines (<20 µm particles) were excluded from the feed. We assert that concurrent grinding may be a suitable technique for the processing of feedstocks such as those containing significant proportions of forsterite and pyroxene, minerals which are unresponsive to thermal activation for use in aqueous mineral carbonation. This study also investigates the effect of different grinding media particle size on reducing the particle size distribution (PSD) of the feed. Optimum ratio of grinding media size to feed particle size, optimum grinding media and slurry concentrations, optimum time for grinding and optimum impeller designs are determined for the system under study. The quantitative effect of grinding media concentration, slurry concentration, pressure and temperature on magnesite yield has been investigated.]]> Wed 10 May 2023 14:51:12 AEST ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:33495 Tue 06 Nov 2018 10:02:35 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:45566 Tue 01 Nov 2022 14:39:59 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:32405 Thu 31 May 2018 09:12:08 AEST ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:38534 Thu 28 Oct 2021 15:49:53 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:12061 Sat 24 Mar 2018 10:33:05 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:8034 Sat 24 Mar 2018 08:36:48 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:1400 Sat 24 Mar 2018 08:28:01 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:1753 Sat 24 Mar 2018 08:27:27 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:12465 Sat 24 Mar 2018 08:17:50 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:12461 Sat 24 Mar 2018 08:17:50 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:9888 Sat 24 Mar 2018 08:12:47 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:20191 Sat 24 Mar 2018 07:51:32 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:4970 Sat 24 Mar 2018 07:46:56 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:28939 Sat 24 Mar 2018 07:31:27 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:28926 600°C). The low temperature phenomena have been studied by quantum chemical techniques and reaction mechanisms to explain products’ formation (including the MCD 3-chlorodibenzofuran) are given. 3-Chlorodibenzofuran (the simplest PCDF) and benzaldehyde are important low temperature products produced by O2 (1∆) in reactors (1) and (2). Both O2 (1∆) and ground state O2 (3 Σ g) can displace Cl atoms from 4-chlorobiphenyl to produce polychlorobenzenes although only O2 (1Δ) produces significant yields of chlorobenzenes at low temperatures. Styrene and naphthalene also arise from O2 displacement of Cl.]]> Sat 24 Mar 2018 07:31:26 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:28271 −1 for S-nitrosothioacetamide and S-nitrosothiourea, respectively. The electron donating effect of methyl substitution in S-nitrosothioacetamide engenders lower activation energies with the bimolecular reaction of RSNO⁺ and RS occurring within the diffusion controlled regime at an activation energy of 17.6 kJ mol⁻¹. For S-nitrosothiourea, a further bimolecular reaction of two RSNO⁺ molecules occurs irreversibly with an activation energy of 84.4 kJ mol⁻¹.]]> Sat 24 Mar 2018 07:28:31 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:28112 Sat 24 Mar 2018 07:24:58 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:3503 Sat 24 Mar 2018 07:20:36 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:3459 Sat 24 Mar 2018 07:20:28 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:23788 Sat 24 Mar 2018 07:16:26 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:23117 Sat 24 Mar 2018 07:15:31 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:23115 (v) or D₂O_(v) respectively, the rate of reaction decreases significantly in the presence of a high concentration of water vapour (ca 12,000 ppm) but the overall rate ratio, CH₄ / H₂O_(v) vs CD₄ / D₂O_(v) increases only slightly, to 3.2 ±0.6. This suggests that the effect of water vapour on the reaction rate is attributable to an equilibrium isotope effect (EIE) but under all reaction conditions studied at 270 °C, the rate limiting step involves methane activation.]]> Sat 24 Mar 2018 07:15:30 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:23116 Sat 24 Mar 2018 07:15:30 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:23114 Sat 24 Mar 2018 07:15:30 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:22079 Sat 24 Mar 2018 07:15:16 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:47580 2) enables its subsequent reaction to form magnesium carbonate, a process called aqueous mineral carbonation. The dissolution rate of magnesium ions (Mg²⁺) from thermally activated serpentine and the factors influencing the rate and extent of dissolution have been studied in our research group. The current contribution focuses on the effect of temperature and pH on the dissolution of heat activated lizardite (a polymorph of serpentine). The extent of dissolution of thermally activated lizardite was measured experimentally as a function of temperature (25 °C≤T≤75 °C) and pH (1.2 ≤ pH≤9.8). It was found that at higher temperatures the level of Mg extraction is greater during the initial stage of dissolution but is then hindered by the re-precipitation of amorphous silica. Thermodynamic modelling was used to assess the susceptibility of solid phase formation and confirmed the likelihood of re-precipitation of amorphous silica from the solutions. For the first time, in this work, the crackling core model (CCM) was used to model experimental data at different pH values.]]> Mon 23 Jan 2023 14:14:29 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:49540 Mon 22 May 2023 08:45:16 AEST ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:37516 Mon 15 Feb 2021 11:37:42 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:45508 Fri 28 Oct 2022 16:14:12 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:38019 29Si solid-state nuclear magnetic resonance (²⁹Si SS NMR), inductively coupled plasma-optical emission spectrometry (ICP-OES), and matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) to characterize carbonation products and to understand the mechanism of formation and the structure of silica-rich byproducts. Thermodynamic analysis predicts the formation of magnesite and amorphous silica in the process of direct aqueous carbonation of heat-activated lizardite under the experimental conditions studied. Characterization of carbonation products disclosed the presence of magnesite, amorphous silica, and magnesium silicate phases. Analysis of supernatant solutions obtained from direct aqueous carbonation by MALDI spectroscopy showed the presence of silica polymers, which precipitate during the carbonation experiments. The precipitated amorphous silica on the surface of reacting particles was found to subsequently adsorb the dissolved magnesium (Mg) from the solution to form a magnesium silicate phase.]]> Fri 23 Jul 2021 15:47:33 AEST ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:42229 Fri 19 Aug 2022 11:35:30 AEST ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:24039 Fri 04 Nov 2016 15:50:53 AEDT ]]> https://novaprd-lb.newcastle.edu.au/vital/access/manager/Repository/uon:24027 Fri 04 Nov 2016 13:09:52 AEDT ]]>