Search

Your search keyword '"Morgan, David J."' showing total 47 results
Start Over Author "Morgan, David J." Publisher wiley
Sorry, I don't understand your search. ×
47 results on '"Morgan, David J."'

10. Glycerol Selective Oxidation to Lactic Acid over AuPt Nanoparticles; Enhancing Reaction Selectivity and Understanding by Support Modification

Author

Douthwaite, Mark, primary, Powell, Natasha, additional, Taylor, Aoife, additional, Ford, Grayson, additional, López, José Manuel, additional, Solsona, Benjamin, additional, Yang, Nating, additional, Sanahuja‐Parejo, Olga, additional, He, Qian, additional, Morgan, David J., additional, Garcia, Tomas, additional, and Taylor, Stuart H., additional

Published
2020
Full Text
View/download PDF

12. The Direct Synthesis of H2O2Using TS‐1 Supported Catalysts

Author

Lewis, Richard J., primary, Ueura, Kenji, additional, Fukuta, Yukimasa, additional, Freakley, Simon J., additional, Kang, Liqun, additional, Wang, Ryan, additional, He, Qian, additional, Edwards, Jennifer. K., additional, Morgan, David J., additional, Yamamoto, Yasushi, additional, and Hutchings, Graham J., additional

Published
2019
Full Text
View/download PDF

15. Activation and Deactivation of Gold/Ceria–Zirconia in the Low‐Temperature Water–Gas Shift Reaction

Author

Carter, James H., primary, Liu, Xi, additional, He, Qian, additional, Althahban, Sultan, additional, Nowicka, Ewa, additional, Freakley, Simon J., additional, Niu, Liwei, additional, Morgan, David J., additional, Li, Yongwang, additional, Niemantsverdriet, J. W. (Hans), additional, Golunski, Stanislaw, additional, Kiely, Christopher J., additional, and Hutchings, Graham J., additional

Published
2017
Full Text
View/download PDF

23. The Low‐Temperature Oxidation of Propane by using H2O2 and Fe/ZSM‐5 Catalysts: Insights into the Active Site and Enhancement of Catalytic Turnover Frequencies

Author

Peneau, Virginie, primary, Armstrong, Robert D., additional, Shaw, Greg, additional, Xu, Jun, additional, Jenkins, Robert L., additional, Morgan, David J., additional, Dimitratos, Nikolaos, additional, Taylor, Stuart H., additional, Zanthoff, Horst W., additional, Peitz, Stefan, additional, Stochniol, Guido, additional, He, Qian, additional, Kiely, Christopher J., additional, and Hutchings, Graham J., additional

Published
2017
Full Text
View/download PDF

33. The Effect of Grafting Zirconia and Ceria onto Alumina as a Support for Silicotungstic Acid for the Catalytic Dehydration of Glycerol to Acrolein

Author

Haider, Muhammad H., primary, D'Agostino, Carmine, additional, Dummer, Nicholas F., additional, Mantle, Mick D., additional, Gladden, Lynn F., additional, Knight, David W., additional, Willock, David J., additional, Morgan, David J., additional, Taylor, Stuart H., additional, and Hutchings, Graham J., additional

Published
2014
Full Text
View/download PDF

43. Bottom-up synthesis of water-soluble gold nanoparticles stabilized by N-Heterocyclic carbenes: From structural characterization to applications

Author

Sophie R. Thomas, Wenjie Yang, David J. Morgan, Thomas E. Davies, Jiao Jiao Li, Roland A. Fischer, Jun Huang, Nikolaos Dimitratos, Angela Casini, Thomas, Sophie R, Yang, Wenjie, Morgan, David J, Davies, Thomas E, Li, Jiao Jiao, Fischer, Roland A, Huang, Jun, Dimitratos, Nikolao, and Casini, Angela

Subjects
spectroscopy, photothermal therapy, Au nanoparticle, Organic Chemistry, Metal Nanoparticles, Water, General Chemistry, catalysi, Wastewater, Ligands, Catalysis, ddc, Nitrophenols, Humans, Colloids, Gold, Research Article, Research Articles, Au nanoparticles, catalysis, N-heterocyclic carbenes, 03 Chemical Sciences, N-heterocyclic carbene, Methane
Abstract

N-heterocyclic carbenes (NHCs) have become attractive ligands for functionalizing gold nanoparticle surfaces with applications ranging from catalysis to biomedicine. Despite their great potential, NHC stabilized gold colloids (NHC@AuNPs) are still scarcely explored and further efforts should be conducted to improve their design and functionalization. Here, the 'bottom-up' synthesis of two water-soluble gold nanoparticles (AuNP-1 and AuNP-2) stabilized by hydrophilic mono- and bidentate NHC ligands is reported together with their characterization by various spectroscopic and analytical methods. The NPs showed key differences likely to be due to the selected NHC ligand systems. Transmission electron microscopy (TEM) images showed small quasi-spherical and faceted NHC@AuNPs of similar particle size (ca. 2.3-2.6 nm) and narrow particle size distribution, but the colloids featured different ratios of Au(I)/Au(0) by X-ray photoelectron spectroscopy (XPS). Furthermore, the NHC@AuNPs were supported on titania and fully characterized. The new NPs were studied for their catalytic activity towards the reduction of nitrophenol substrates, the reduction of resazurin and for their photothermal efficiency. Initial results on their application in photothermal therapy (PTT) were obtained in human cancer cells in vitro. The aforementioned reactions represent important model reactions towards wastewater remediation, bioorthogonal transformations and cancer treatment.

Published
2022

44. The Low-Temperature Oxidation of Propane by using H2O2and Fe/ZSM-5 Catalysts: Insights into the Active Site and Enhancement of Catalytic Turnover Frequencies

Author

Virginie Peneau, Robert Leyshon Jenkins, Greg Shaw, Stefan Peitz, Stuart Hamilton Taylor, Robert Armstrong, Graham J. Hutchings, Zanthoff Horst-Werner, Nikolaos Dimitratos, Jun Xu, Christopher J. Kiely, David J. Morgan, Qian He, Guido Stochniol, Peneau, Virginie, Armstrong, Robert D., Shaw, Greg, Xu, Jun, Jenkins, Robert L., Morgan, David J., Dimitratos, Nikolao, Taylor, Stuart H., Zanthoff, Horst W., Peitz, Stefan, Stochniol, Guido, He, Qian, Kiely, Christopher J., and Hutchings, Graham J.

Subjects
Inorganic chemistry, Iron oxide, 010402 general chemistry, 01 natural sciences, Catalysis, Catalysi, Inorganic Chemistry, chemistry.chemical_compound, Propane, QD, Partial oxidation, Physical and Theoretical Chemistry, Zeolite, propane oxidation, Alkane, chemistry.chemical_classification, Aqueous solution, 010405 organic chemistry, Organic Chemistry, selective oxidation, 0104 chemical sciences, natural ga, chemistry, ZSM-5, zeolite catalyst
Abstract

Fe-containing ZSM-5 catalysts are reported to be efficient catalysts for the partial oxidation of propane to oxygenated products at reaction temperatures as low as 50 °C in an aqueous phase reaction when using the green oxidant H2O2. It was previously proposed that extra framework Fe species at the exchange sites of the zeolite are responsible for activation of both the alkane and hydrogen peroxide. Through a systematic study of the influence of framework topology and exchange properties, it is now shown that this high catalytic activity is specific to the MFI-type Brønsted acidic zeolite ZSM-5. Furthermore, through a simple aqueous acid washing treatment, leaching of approximately 77 % of iron present within a Fe/ZSM-5 catalyst only caused the relative propane conversion to decrease by 17 %; implying that most of the initially loaded Fe does not actually contribute to the catalytic activity. This small change in conversion after ‘excess’ Fe removal, amounts to a three-fold increase in turnover frequency (TOF) (Fe) from 66 h−1 to 232 h−1 compared with the parent Fe/ZSM-5 catalyst. By comparing these samples, it is shown by NH3 temperature-programmed desorption, 27Al magic angle spinning NMR spectroscopy, X-ray photoelectron spectroscopy and TEM analysis that surface iron oxide species are effectively spectators in the oxidation of propane with H2O2. This provides further insight as to the location and true nature of the catalytically active Fe species.

Published
2017

45. Highly active gold and gold-palladium catalysts prepared by colloidal methods in the absence of polymer stabilizers

Author

Graham J. Hutchings, Qian He, Simon J. Freakley, Christopher J. Kiely, Nikolaos Dimitratos, David J. Morgan, Laura Abis, Meenakshisundaram Sankar, Georgios Dodekatos, Abis, Laura, Freakley, Simon J., Dodekatos, Georgio, Morgan, David J., Sankar, Meenakshisundaram, Dimitratos, Nikolao, He, Qian, Kiely, Christopher J., and Hutchings, Graham J.

Subjects
inorganic chemicals, Materials science, oxidation, chemistry.chemical_element, Nanoparticle, 010402 general chemistry, 01 natural sciences, Polyvinyl alcohol, Catalysis, Catalysi, Inorganic Chemistry, chemistry.chemical_compound, Organic chemistry, heterocyclic compounds, QD, Physical and Theoretical Chemistry, colloid, chemistry.chemical_classification, 010405 organic chemistry, organic chemicals, nanoparticle, Organic Chemistry, Polymer, gold, palladium, Nanomaterial-based catalyst, 0104 chemical sciences, chemistry, Chemical engineering, Benzyl alcohol, Palladium, Stabilizer (chemistry)
Abstract

Supported gold and gold–palladium nanoparticles were found to be effective catalysts for the selective oxidation of glycerol and benzyl alcohol. The properties and stabilities of catalysts are often sensitive to factors such as the dimensions, shape, and composition of the metal nanoparticles. Although colloidal methods provide an easy and quick way to synthesize supported metal catalysts, they typically involve the use of polymers such as polyvinyl alcohol and polyvinylpyrrolidone as steric stabilizers, which can sometimes be detrimental in subsequent catalytic reactions. Herein, we report the synthesis of supported gold and gold–palladium nanoparticles without the addition of stabilizing polymers. The catalysts prepared with and without the addition of polymers performed very similarly in the selective oxidation of glycerol and benzyl alcohol, which suggests that polymers are not essential to make active catalysts for these reactions. Thus, this new stabilizer‐free method provides a facile and highly effective way of circumventing the inherent problems of polymer stabilizers in the preparation of gold and gold–palladium catalysts.

Published
2017

46. Spectroscopic investigation of Titania-supported gold nanoparticles prepared by a modified deposition/precipitation method for the oxidation of CO

Author

Laura Prati, Carine E. Chan-Thaw, David J. Morgan, Ilenia Rossetti, Nikolaos Dimitratos, Di Wang, Matteo Compagnoni, Alberto Villa, Simon A. Kondrat, Compagnoni, Matteo, Kondrat, Simon A., Chan-Thaw, Carine E., Morgan, David J., Wang, Di, Prati, Laura, Villa, Alberto, Dimitratos, Nikolao, and Rossetti, Ilenia

Subjects
Diffuse reflectance infrared fourier transform, gold catalysi, Nanoparticle, Nanotechnology, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Catalysis, Catalysi, Inorganic Chemistry, Adsorption, Physisorption, X-ray photoelectron spectroscopy, QD, Physical and Theoretical Chemistry, Chemistry, Precipitation (chemistry), Organic Chemistry, deposition/precipitation method, 021001 nanoscience & nanotechnology, CO oxidation, 0104 chemical sciences, Chemical engineering, Colloidal gold, DRIFTS, 0210 nano-technology, Dispersion (chemistry)
Abstract

The spectroscopic characterization of a material is a fundamental tool for understanding the structure–activity correlation for catalytic purposes. Regarding supported nanoparticles, this perspective has acquired more relevance in recent years and several techniques have been employed. In this work diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), coupled with CO adsorption, was used to investigate a modified deposition/precipitation method (DP-UC) for the preparation of supported gold nanoparticles with very low metal loading (0.1–0.5 wt %). This promising synthetic route involves the use of urea as basic agent and NaBH4 as chemical reductant in contrast to the traditional high-temperature reduction step. The systematic IR spectroscopic study of the Au loading was combined with CO oxidation catalytic tests. The evaluation of the results was also supported by several other techniques, such as X-ray photoelectron spectroscopy, N2 physisorption, and transmission electron microscopy. Particular attention was given to the evaluation of the gold electronic state, surface dispersion, particle size, and the corresponding structure–activity relationship.

Published
2016

47. How and why do countries differ in their governance and financing-related administrative expenditure in health care? An analysis of OECD countries by health care system typology.

Author

Hagenaars LL, Klazinga NS, Mueller M, Morgan DJ, and Jeurissen PPT

Subjects
Delivery of Health Care organization & administration, Humans, Organisation for Economic Co-Operation and Development organization & administration, Delivery of Health Care economics, Health Expenditures statistics & numerical data, Healthcare Financing, Organisation for Economic Co-Operation and Development economics
Abstract

Introduction: Administration is vital for health care. Its importance may increase as health care systems become more complex, but academic attention has remained minimal. We investigated trends in administrative expenditure across OECD countries, cross-country spending differences, spending differences between health care system typologies, and differences in the scale and scope of administrative functions across typologies., Methods: We used OECD data, which include health system governance and financing-related administrative activities by regulators, governance bodies, and insurers (macrolevel), but exclude administrative expenditure by health care providers (mesolevel and microlevel)., Results: We find that governance and financing-related administrative spending at the macrolevel has remained stable over the last decade at slightly over 3% of total health spending. Cross-country differences range from 1.3% of health spending in Iceland to 8.3% in the United States. Voluntary private health insurance bears much higher administrative costs than compulsory schemes in all countries. Among compulsory schemes, multiple payers exhibit significantly higher administrative spending than single payers. Among single-payer schemes, those where entitlements are based on residency have significantly lower administrative spending than those with single social health insurance, albeit with a small difference., Discussion: These differences can partially be explained because multi-payer and voluntary private health insurance schemes require additional administrative functions and enjoy less economies of scale. Studies in hospitals and primary care indicate similar differences in administrative costs across health system typologies at the mesolevel and microlevel of health care delivery, which warrants more research on total administrative costs at all the levels of health systems., (Copyright © 2017 John Wiley & Sons, Ltd.)

Published
2018
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results