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822 results on '"McKeown, Neil"'

206. Tunable Porous Organic Crystals: Structural Scope and Adsorption Properties of Nanoporous Steroidal Ureas

Author

Natarajan, Ramalingam, primary, Bridgland, Lydia, additional, Sirikulkajorn, Anchalee, additional, Lee, Ji-Hun, additional, Haddow, Mairi F., additional, Magro, Germinal, additional, Ali, Bakhat, additional, Narayanan, Sampriya, additional, Strickland, Peter, additional, Charmant, Jonathan P. H., additional, Orpen, A. Guy, additional, McKeown, Neil B., additional, Bezzu, C. Grazia, additional, and Davis, Anthony P., additional

Published
2013
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216. Polymer of Intrinsic Microporosity Induces Host-Guest Substrate Selectivity in Heterogeneous 4-Benzoyloxy-TEMPO-Catalysed Alcohol Oxidations.

Author

Ahn, Sunyhik, Kolodziej, Adam, Malpass-Evans, Richard, Carta, Mariolino, McKeown, Neil, Bull, Stephen, Buchard, Antoine, and Marken, Frank

Abstract

The free radical 4-benzoyloxy-2,2,6,6-tetramethylpiperidine-1-oxyl (4B-TEMPO) is active as an electrocatalyst for primary alcohol oxidations when immobilised at an electrode surface and immersed into an aqueous carbonate buffer solution. In order to improve the catalytic process, a composite film electrode is developed based on (i) carbon microparticles of 2-12 μm diameter to enhance charge transport and (ii) a polymer of intrinsic microporosity (here PIM-EA-TB with a BET surface area of 1027 m g). The latter acts as a highly rigid molecular framework for the embedded free radical catalyst with simultaneous access to aqueous phase and substrate. The resulting mechanism for the oxidation of primary alcohols is shown to switch in reaction order from first to zeroth with increasing substrate concentration consistent with a kinetically limited process with competing diffusion of charge at the polymer layer-electrode interface (here the 'LEk' case in Albery-Hillman notation). Reactivity optimisation and screening for a wider range of primary alcohols in conjunction with DFT-based relative reactivity correlation reveals substrate hydrophobicity as an important factor for enhancing catalytic currents. The PIM-EA-TB host matrix is proposed to control substrate partitioning and thereby catalyst reactivity and selectivity. [Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]

Published
2016
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220. Methane oxidation using silica-supported N-bridged di-iron phthalocyanine catalyst

Author

Forde, Michael M., primary, Grazia, Bezzu C., additional, Armstrong, Robert, additional, Jenkins, Robert L., additional, Rahim, Mohammed Hasbi Ab, additional, Carley, Albert F., additional, Dimitratos, Nikolaos, additional, Lopez-Sanchez, Jose Antonio, additional, Taylor, Stuart H., additional, McKeown, Neil B., additional, and Hutchings, Graham John, additional

Published
2012
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240. Nitrogen and Hydrogen Adsorption by an Organic Microporous Crystal

Author

Msayib, Kadhum J., primary, Book, David, additional, Budd, Peter M., additional, Chaukura, Nhamo, additional, Harris, Kenneth D. M., additional, Helliwell, Madeleine, additional, Tedds, Steven, additional, Walton, Allan, additional, Warren, John E., additional, Xu, Mingcan, additional, and McKeown, Neil B., additional

Published
2009
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243. The structure-property relationships of Polymers of Intrinsic Microporosity (PIMs).

Author

McKeown, Neil B

Subjects
MICROPOROSITY, GAS absorption & adsorption, POLYMERS, THERMAL properties, SOLUBILITY
Abstract

Based on almost 20 years of published research, the structure-property relationships of Polymers of Intrinsic Microporosity (PIMs) are considered. Following an analysis of the structure of the archetypal PIM-1 and how it contributes to its now well-understood properties, the key properties of solubility, thermal properties, gas adsorption and gas permeability are related to the structures of more recently prepared PIMs. In order to deliver their technological potential, it is recommended that further synthetic effort should focus both on broadening the structural diversity of PIMs and providing synthetically accessible variants. [ABSTRACT FROM AUTHOR]

Published
2022
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