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Your search keyword '"Thompson, Jillian M."' showing total 27 results
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27 results on '"Thompson, Jillian M."'

1. Oxidation of Alcohols and Aldehydes with Peracetic Acid and a Mn(II)/Pyridin‐2‐Carboxylato Catalyst: Substrate and Continuous Flow Studies.

Author

Ryan, Ailbhe A., Dempsey, Seán D., Smyth, Megan, Fahey, Karen, Moody, Thomas S., Wharry, Scott, Dingwall, Paul, Rooney, David W., Thompson, Jillian M., Knipe, Peter C., and Muldoon, Mark J.

Subjects
EXOTHERMIC reactions, PERACETIC acid, CATALYSTS, MANGANESE, OXIDIZING agents
Abstract

A homogeneous catalyst system consisting of Mn(OAc)2 and 2‐picolinic acid was studied for alcohol oxidation using peracetic acid as the oxidant. Catalyst loadings as low as 0.01 mol% could be utilized and the system compared well to other peroxide based methods. The utilization of continuous flow allowed the fast, exothermic reactions to be carried out in a safe and scalable manner. [ABSTRACT FROM AUTHOR]

Published
2024
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2. Continuous-flow transfer hydrogenation of benzonitrile using formate as a safe and sustainable source of hydrogen

Author

Dempsey, Seán D., Ryan, Ailbhe A., Smyth, Megan, Moody, Thomas S., Wharry, Scott, Fahey, Karen, Beale, Andrew M., Mediavilla Madrigal, Sofia, Dingwall, Paul, Rooney, David W., Knipe, Peter C., Muldoon, Mark J., and Thompson, Jillian M.

Abstract

The continuous catalytic transfer hydrogenation of benzonitrile to benzylamine is demonstrated using a palladium on carbon catalyst with triethylammonium formate as reducing agent. Solvent choice was critical in overcoming rapid catalyst deactivation. A 15-fold increase in catalyst productivity was observed in flow compared to batch, which was achieved using an ethanol–water solvent in combination with intermittent catalyst regeneration by washing with water.

Published
2023

4. Continuous-flow transfer hydrogenation of benzonitrile using formate as a safe and sustainable source of hydrogen

Author

Dempsey, Seán D., primary, Ryan, Ailbhe A., additional, Smyth, Megan, additional, Moody, Thomas S., additional, Wharry, Scott, additional, Fahey, Karen, additional, Beale, Andrew M., additional, Mediavilla Madrigal, Sofia, additional, Dingwall, Paul, additional, Rooney, David W., additional, Knipe, Peter C., additional, Muldoon, Mark J., additional, and Thompson, Jillian M., additional

Published
2023
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7. Raman and ab initio studies of simple and binary 1-alkyl-3-methylimidazolium ionic liquids

Author

Berg, Rolf W., Deetlefs, Maggel, Seddon, Kenneth R., Shim, Irene, and Thompson, Jillian M.

Subjects
Imidazole -- Spectra, Imidazole -- Chemical properties, Methyl groups -- Spectra, Methyl groups -- Chemical properties, Raman spectroscopy -- Usage, Chemicals, plastics and rubber industries
Abstract

Raman spectra of the ionic liquids, 1-butyl-3-methylimidazolium hexafluorophosphate ([C4mim] [PF6]), 1-hexyl-3-methylimidazolium chloride ([C6mim]Cl), and 1-hexyl-3-methylimidazolium hexafluorophosphate ([C4mim] [PF6]), and binary mixtures thereof, are assigned using ab initio MP2 calculations. The vibrational analysis of the binary system reveal that the changes in hydrogen bonding to the ring hydrogen atoms do not have any detectable effect on the 50:50 distribution of the two conformers.

Published
2005

13. Selective Hydrogenation of Halogenated Arenes using porous Manganese Oxide (OMS-2) and Platinum supported OMS-2 Catalysts

Author

McManus, Iain J., Daly, Helen, Manyar, Haresh G, Taylor, S. F. Rebecca, Thompson, Jillian M., and Hardacre, Christopher

Subjects
Physical and Theoretical Chemistry
Abstract

Porous manganese oxide (OMS-2) and platinum supported on OMS-2 catalysts have been shown to facilitate the hydrogenation of the nitro group on chloronitrobenzene to give chloroaniline with no dehalogenation. Complete conversion was obtained within 2 h at 25 [degree]C and, although the rate of reaction increased with increasing temperature up to 100 [degree]C, the selectivity to chloroaniline remained at 99.0%. Use of Pd/OMS-2 or Pt/Al2O3 resulted in significant dechlorination even at 25 [degree]C and 2 bar hydrogen pressure giving selectivity to chloroaniline of 34.5% and 77.8%, respectively, at complete conversion. This demonstrates the potential of using platinum group metal free catalysts for the selective hydrogenation of halogenated aromatics. Two pathways were observed for the analogous nitrobenzene hydrogenation depending on the catalyst used. The hydrogenation of nitrobenzene was found to follow a direct pathway to aniline and nitrosobenzene over Pd/OMS-2 in contrast to the OMS and Pt/OMS-2 catalysts which resulted in formation of nitrosobenzene, azoxybenzene and azobenzene/hydrazobenzene intermediates before complete conversion to aniline. These results indicate that for the Pt/OMS-2 the hydrogenation proceeds predominantly over the support with the metal acting to dissociate the hydrogen. In the case of the Pd/OMS-2 both the hydrogenation and the hydrogen adsorption occur on the metal sites.

Published
2016

17. Improved Efficiency for Partial Oxidation of Methane by Controlled Copper Deposition on Surface-Modified ZSM-5.

Author

Sheppard, Thomas, Daly, Helen, Goguet, Alex, and Thompson, Jillian M.

Subjects
PARTIAL oxidation, OXIDATION, METHANE, METHANOL, COPPER, ZEOLITES
Abstract

The mono(μ-oxo) dicopper cores present in the pores of Cu-ZSM-5 are active for the partial oxidation of methane to methanol. However, copper on the external surface reduces the ratio of active, selective sites to unselective sites. More efficient catalysts are obtained by controlling the copper deposition during synthesis. Herein, the external exchange sites of ZSM-5 samples were passivated by bis(trimethylsilyl) trifluoroacetamide (BSTFA) followed by calcination, promoting selective deposition of intraporous copper during aqueous copper ion exchange. At an optimum level of 1-2 wt % SiO2, IR studies showed a 64 % relative reduction in external copper species and temperature-programmed oxidation analysis showed an associated increase in the formation of methanol compared with unmodified Cu-ZSM-5 samples. It is, therefore, reported that the modified zeolites contained a significantly higher proportion of active, selective copper species than their unmodified counterparts with activity for partial methane oxidation to methanol. [ABSTRACT FROM AUTHOR]

Published
2016
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27. Heterogeneous oxidation of pyrimidine and alkyl thioethers in ionic liquids over mesoporous Ti or Ti/Ge catalysts.

Author

Cimpeanu V, Parvulescu VI, Amorós P, Beltrán D, Thompson JM, and Hardacre C

Subjects
Catalysis, Molecular Structure, Oxidation-Reduction, Particle Size, Porosity, Silicon Dioxide chemistry, Solvents chemistry, Sulfides chemical synthesis, Germanium chemistry, Pyrimidines chemistry, Sulfides chemistry, Titanium chemistry
Abstract

Heterogeneous catalytic oxidation of a series of thioethers (2-thiomethylpyrimidine, 2-thiomethyl-4,6-dimethyl-pyrimidine, 2-thiobenzylpyrimidine, 2-thiobenzyl-4,6-dimethylpyrimidine, thioanisole, and n-heptyl methyl sulfide) was performed in ionic liquids by using MCM-41 and UVM-type mesoporous catalysts containing Ti, or Ti and Ge. A range of triflate, tetrafluoroborate, trifluoroacetate, lactate and bis(trifluoromethanesulfonyl)imide-based ionic liquids were used. The oxidations were carried out by using anhydrous hydrogen peroxide or the urea-hydrogen peroxide adduct and showed that ionic liquids are very effective solvents, achieving greater reactivity and selectivity than reactions performed in dioxane. The effects of halide and acid impurities on the reactions were also investigated. Recycling experiments on catalysts were carried out in order to evaluate Ti leaching and its effect on activity and selectivity.

Published
2004
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