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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Wood, Joseph
University of Birmingham
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (16/16 displayed)
- 2023Anisole hydrodeoxygenation over nickel-based catalystscitations
- 20213D printed re-entrant cavity resonator for complex permittivity measurement of crude oilscitations
- 2020Mild-temperature hydrodeoxygenation of vanillin a typical bio-oil model compound to creosol a potential future biofuelcitations
- 2020Maximizing paraffin to olefin ratio employing simulated nitrogen-rich syngas via Fischer-Tropsch process over Co3O4/SiO2 catalystscitations
- 2020Tetralin and decalin h-donor effect on catalytic upgrading of heavy oil inductively heated with steel ballscitations
- 2020Organocatalysis for versatile polymer degradationcitations
- 2019Poly(lactic acid) degradation into methyl lactate catalyzed by a well-defined Zn(II) complexcitations
- 2019Reaction kinetics of vanillin hydrodeoxygenation in acidic and nonacidic environments using bimetallic PdRh/Al2O3 catalystcitations
- 2019A mechanistic study of Layered-Double Hydroxide (LDH)-derived nickel-enriched mixed oxide (Ni-MMO) in ultradispersed catalytic pyrolysis of heavy oil and related petroleum coke formationcitations
- 2018Catalytic performance of Ni-Cu/Al2O3 for effective syngas production by methanol steam reformingcitations
- 2017In-situ catalytic upgrading of heavy oil using dispersed bionanoparticles supported on gram-positive and gram-negative bacteriacitations
- 2016Selective hydrogenation using palladium bioinorganic catalystcitations
- 2011Improving the interpretation of mercury porosimetry data using computerised X-ray tomography and mean-field DFTcitations
- 2008Experimental and modelling studies of the kinetics of mercury retraction from highly confined geometries during porosimetry in the transport and the quasi-equilibrium regimescitations
- 2006Studies of the entrapment of non-wetting fluid within nanoporous media using a synergistic combination of MRI and micro-computed X-ray tomographycitations
- 2005Minimisation and recycling of spent acid wastes from galvanising plantscitations
Places of action
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article
Poly(lactic acid) degradation into methyl lactate catalyzed by a well-defined Zn(II) complex
Abstract
Poly(lactic acid) (PLA) was degraded to methyl lactate (Me-La) by an imino monophenolate Zn(1)2 catalyst in the presence of THF, as the solvent, and methanol, as the protic source. As well as solution-based polymerization and degradation, catalyst stability was assessed and discussed. The chemical degradation of four different commercial samples of PLA, varying in molecular weight, was studied. The effect of PLA concentration (0.05 to 0.2 g mL-1), reaction temperature (40 to 130 °C), and catalyst concentration (4 to 16 wt%) on conversion, yield and selectivity were studied and results statistically analyzed. Mass transfer limitations were assessed by utilizing two different PLA particle sizes and altering the stirring speed. Results revealed that the main variables affecting PLA degradation are temperature and catalyst concentration. It was possible to observe Me-La formation even at 40 °C although the reaction times were significantly longer when compared to the highest temperatures. Conversions of 100%, as determined by 1H NMR spectroscopy and GPC, were possible in short times (<15 min) depending on temperature and catalyst concentration. A reaction mechanism for the production of Me-La from PLA, which considers the formation of chain-end groups as intermediates is presented and values for the kinetic constants are determined from the model. The activation energy for the initial degradation step was in the range 39 to 66 kJ mol-1, decreasing with increasing catalyst loading.