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  1. Book ; Conference proceedings: Michael Freemans Foto-Workshop

    Freeman, Michael / Bowker, Daniela

    Komposition

    2013  

    Title translation Michael Freeman's photo school. Composition <dt.>
    Author's details in Zsarbeit mit Daniela Bowker
    Language German
    Size 160 S., zahlr. Ill.
    Edition Autoris. dt. Ausg.
    Publisher National Geographic Deutschland (G+J/RBA)
    Publishing place Hamburg
    Document type Book ; Conference proceedings
    ISBN 9783866903449 ; 3866903448
    Database Former special subject collection: coastal and deep sea fishing

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  2. Article: Methanol Synthesis from CO

    Bowker, Michael

    ChemCatChem

    2019  Volume 11, Issue 17, Page(s) 4238–4246

    Abstract: In the future we will be phasing out the use of fossil fuels in favour of more sustainable forms of energy, especially solar derived forms such as hydroelectric, wind and photovoltaic. However, due to the variable nature of the latter sources which ... ...

    Abstract In the future we will be phasing out the use of fossil fuels in favour of more sustainable forms of energy, especially solar derived forms such as hydroelectric, wind and photovoltaic. However, due to the variable nature of the latter sources which depend on time of day, and season of the year, we also need to have a way of storing such energy at peak production times for use in times of low production. One way to do this is to convert such energy into chemical energy, and the principal way considered at present is the production of hydrogen. Although this may be achieved directly in the future via photocatalytic water splitting, at present it is electrolytic production which dominates thinking. In turn, it may well be important to store this hydrogen in an energy dense liquid form such as methanol or ammonia. In this brief review it is emphasised that CO
    Language English
    Publishing date 2019-07-10
    Publishing country Germany
    Document type Journal Article ; Review
    ZDB-ID 2501161-3
    ISSN 1867-3899 ; 1867-3880
    ISSN (online) 1867-3899
    ISSN 1867-3880
    DOI 10.1002/cctc.201900401
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: The Catalytic Reactivity of Alloys; Ethanol and Formic Acid Decomposition on Cu-Pd(110).

    Bowker, Michael / Holroyd, Richard / Perkins, Neil

    The journal of physical chemistry. C, Nanomaterials and interfaces

    2022  Volume 126, Issue 37, Page(s) 15703–15709

    Abstract: The effect of alloying Cu and Pd on the reactivity pattern for formic acid and for ethanol has been examined. The electronic structure of the material is strongly affected by the alloying, with the d-band lowered in energy and filled, compared with Pd ... ...

    Abstract The effect of alloying Cu and Pd on the reactivity pattern for formic acid and for ethanol has been examined. The electronic structure of the material is strongly affected by the alloying, with the d-band lowered in energy and filled, compared with Pd alone. Hence the reactivity would be expected to be strongly affected by the alloying. This appears to be the case for formic acid decomposition, whose decomposition temperature in temperature-programmed desorption is shifted by alloying and is between the temperatures for the individual components (at 350 K, compared with 250 and 470 K for Pd and Cu, respectively). However, when a different molecule is chosen as the probe of surface reactivity, namely, ethanol, we come to a very different conclusion. Here the individual reactivity patterns for the two elemental components of the alloy are seen, namely, dehydrogenation on the Cu (to produce acetaldehyde) and decarbonylation on Pd (to methane and CO). There are effects of alloying on destabilizing the former pathway and stabilizing the latter, but the major conclusion from this work is that it is not average electronic structure that dictates reactivity but the individual atomic nature of the surface components. Only monodentate adsorbates truly probe this behavior.
    Language English
    Publishing date 2022-09-12
    Publishing country United States
    Document type Journal Article
    ISSN 1932-7447
    ISSN 1932-7447
    DOI 10.1021/acs.jpcc.2c04881
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: The Role of Metal Nanoparticles in Promoting Photocatalysis by TiO

    Bowker, Michael / O'Rourke, Christopher / Mills, Andrew

    Topics in current chemistry (Cham)

    2022  Volume 380, Issue 3, Page(s) 17

    Abstract: In this review, we highlight the role played by metal nanoparticles (NPs) in photocatalytic oxidation with titania as a support. This is presented in two parts, namely, partial photo-oxidation in which an organic sacrificial agent is oxidised in ... ...

    Abstract In this review, we highlight the role played by metal nanoparticles (NPs) in photocatalytic oxidation with titania as a support. This is presented in two parts, namely, partial photo-oxidation in which an organic sacrificial agent is oxidised in anaerobic conditions to produce hydrogen (photo-reforming), and photo-oxidative mineralisation of organics in aerobic conditions. We present some rules for such reactions that dictate which organic molecules can react readily, and which metals are likely to be useful for such reactions. Generally, the presence of metal NPs enhances enormously the ability of titania to yield hydrogen from photo-reforming, and a wide range of molecules can be used, including biomass. The metal NPs most used are those that are easily reduced, that is, the precious metals. The large enhancement in rate seen with metal for hydrogen production is not so extreme for the oxidation reactions, but is still significant. An important factor in all of this catalysis is the nature of the interaction between the metal NPs, which can play a multiplicity of chemical and electronic roles, and the photoactive support. A sharp dependency of rate on loading of metal is found, with maximum rates at ~0.5-2 wt% loading, depending on the metal used. The source of this dependency is the bifunctional nature of the system, in which the intimacy of both materials is crucial to performance. This rate variation is linked to the interface between the two, which is then linked to the size of the metal NPs. In fact, the rate is proportional to an area adjacent to the metal particles that we call the expanding photocatalytic area and overlap (EPAO) kinetic model. This model describes the dependence well. Rising rates with increasing coverage of particles is associated with increase in this total area but, at the maximum, these areas overlap and at higher loadings the available active area diminishes, reproducing the observed behaviour well.
    MeSH term(s) Catalysis ; Hydrogen/chemistry ; Metal Nanoparticles/chemistry ; Titanium/chemistry
    Chemical Substances titanium dioxide (15FIX9V2JP) ; Hydrogen (7YNJ3PO35Z) ; Titanium (D1JT611TNE)
    Language English
    Publishing date 2022-03-03
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2848485-X
    ISSN 2364-8961 ; 2365-0869
    ISSN (online) 2364-8961
    ISSN 2365-0869
    DOI 10.1007/s41061-022-00373-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Sympatric soil biota mitigate a warmer-drier climate for Bouteloua gracilis.

    Remke, Michael J / Johnson, Nancy C / Bowker, Matthew A

    Global change biology

    2022  Volume 28, Issue 21, Page(s) 6280–6292

    Abstract: Climate change is altering temperature and precipitation, resulting in widespread plant mortality and shifts in plant distributions. Plants growing in soil types with low water holding capacity may experience intensified effects of reduced water ... ...

    Abstract Climate change is altering temperature and precipitation, resulting in widespread plant mortality and shifts in plant distributions. Plants growing in soil types with low water holding capacity may experience intensified effects of reduced water availability as a result of climate change. Furthermore, complex biotic interactions between plants and soil organisms may mitigate or exacerbate the effects of climate change. This 3-year field experiment observed the performance of Bouteloua gracilis ecotypes that were transplanted across an environmental gradient with either sympatric soil from the seed source location or allopatric soil from the location that plants were transplanted into. We also inoculated plants with either sympatric or allopatric soil biotic communities to test: (1) how changes in climate alone influence plant growth, (2) how soil types interact with climate to influence plant growth, and (3) the role of soil biota in mitigating plant migration to novel environments. As expected, plants moved to cooler-wetter sites exhibited enhanced growth; however, plants moved to warmer-drier sites responded variably depending on the provenance of their soil and inoculum. Soil and inoculum provenance had little influence on the performance of plants moved to cooler-wetter sites, but at warmer-drier sites they were important predictors of plant biomass, seed set, and specific leaf area. Specifically, transplants inoculated with their sympatric soil biota and grown in their sympatric soil were as large as or larger than reference plants grown at the seed source locations; however, individuals inoculated with allopatric soil biota were smaller than reference site individuals at warmer, drier sites. These findings demonstrate complicated plant responses to various aspects of environmental novelty where communities of soil organisms may help ameliorate stress. The belowground microbiome of plants should be considered to predict the responses of vegetation more accurately to climate change.
    MeSH term(s) Biota ; Climate Change ; Humans ; Plants ; Poaceae ; Soil ; Water
    Chemical Substances Soil ; Water (059QF0KO0R)
    Language English
    Publishing date 2022-08-29
    Publishing country England
    Document type Journal Article
    ZDB-ID 1281439-8
    ISSN 1365-2486 ; 1354-1013
    ISSN (online) 1365-2486
    ISSN 1354-1013
    DOI 10.1111/gcb.16369
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

    Z 6338: Show issues

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  6. Article: Enhanced H

    Sharma, Pankaj / Slater, Thomas J A / Sharma, Monika / Bowker, Michael / Catlow, C Richard A

    Chemistry of materials : a publication of the American Chemical Society

    2022  Volume 34, Issue 12, Page(s) 5511–5521

    Abstract: ... Solar ... ...

    Abstract Solar H
    Language English
    Publishing date 2022-06-08
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1500399-1
    ISSN 1520-5002 ; 0897-4756
    ISSN (online) 1520-5002
    ISSN 0897-4756
    DOI 10.1021/acs.chemmater.2c00528
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Identification of C

    Ruiz Esquius, Jonathan / Bahruji, Hasliza / Bowker, Michael / Hutchings, Graham J

    Faraday discussions

    2021  Volume 230, Page(s) 52–67

    Abstract: The combination of a methanol synthesis catalyst and a solid acid catalyst opens the possibility to obtain olefins or paraffins directly from CO2 and H2 in one step. In this work several PdZn/TiO2-ZSM-5 hybrid catalysts were employed under CO2 ... ...

    Abstract The combination of a methanol synthesis catalyst and a solid acid catalyst opens the possibility to obtain olefins or paraffins directly from CO2 and H2 in one step. In this work several PdZn/TiO2-ZSM-5 hybrid catalysts were employed under CO2 hydrogenation conditions (240-360 °C, 20 bar, CO2/N2/H2 = 1 : 1 : 3) for the synthesis of CH3OH, consecutive dehydration to dimethyl ether and further oxygenate conversion to hydrocarbons. No significant changes after 36 h reaction on the methanol synthesis catalyst (PdZn/TiO2) were observed by XRD, XAS or XPS. No olefins were observed, indicating that light olefins undergo further hydrogenation under the reaction conditions, yielding the corresponding alkanes. Increasing the aluminium sites in the zeolites (Si : Al ratio 80 : 1, 50 : 1 and 23 : 1) led to a higher concentration of mild Brønsted acid sites, promoting hydrocarbon chain growth.
    Language English
    Publishing date 2021-04-01
    Publishing country England
    Document type Journal Article
    ISSN 1364-5498
    ISSN (online) 1364-5498
    DOI 10.1039/d0fd00135j
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Delaminated hydrotalcite precursors for green methanol synthesis

    James Hayward / Jonathan Ruiz Esquius / Nia Richards / Wilm Jones / Daniel Hewes / Michael Bowker

    Catalysis Communications, Vol 179, Iss , Pp 106694- (2023)

    2023  

    Abstract: Co-precipitation was used to prepare a copper, zinc, and aluminium hydrotalcite-like precursor to make a methanol synthesis catalyst. Treatment of the wet precursor with an aqueous miscible organic solvent led to the delamination of the sheet-like ... ...

    Abstract Co-precipitation was used to prepare a copper, zinc, and aluminium hydrotalcite-like precursor to make a methanol synthesis catalyst. Treatment of the wet precursor with an aqueous miscible organic solvent led to the delamination of the sheet-like structure of the precursor phase, dramatically increasing the surface area to 340 m2 g−1 in comparison to 22 m2 g−1 for the untreated material. We show that the copper is initially sequestered within the hydrotalcite phase, and during calcination a CuO phase evolves out from the lamellar structures. Reduction proceeds to Cu0, and neither the calcination nor reduction of the material cause the loss of the lamellar morphology. This leads to high Cu0 surface areas in the final catalyst (66 m2 g−1) and high activity in the methanol synthesis reaction.
    Keywords Green methanol ; CO2 hydrogenation ; Methanol synthesis ; Hydrotalcite ; Delamination ; Copper catalyst ; Chemistry ; QD1-999
    Language English
    Publishing date 2023-06-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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  9. Book: Levin and O'Neal's The diabetic foot

    Bowker, John H. / Pfeifer, Michael A. / Levin, Marvin E. / O'Neal, Lawrence W.

    2008  

    Title variant The diabetic foot
    Author's details John H. Bowker ; Michael A. Pfeifer
    Keywords Diabetic Foot ; Foot/Diseases ; Diabetes/Complications ; Foot/Surgery
    Subject code 617.585
    Language English
    Size XVIII, 550 S. : Ill., graph. Darst.
    Edition 7. ed.
    Publisher Mosby Elsevier
    Publishing place Philadelphia, Pa
    Publishing country United States
    Document type Book
    HBZ-ID HT015258959
    ISBN 978-0-323-04145-4 ; 0-323-04145-0
    Database Catalogue ZB MED Medicine, Health

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    In stock of ZB MED Cologne/Königswinter

    Shelf markLoan statusLocation
    2007 A 6028 order for loan Magazin

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  10. Article ; Online: The role of precursor states in adsorption, surface reactions and catalysis.

    Bowker, Michael

    Journal of physics. Condensed matter : an Institute of Physics journal

    2010  Volume 22, Issue 26, Page(s) 263002

    Abstract: Among the many concepts which have been developed in surface science to explain the nature of adsorption, the role of weakly-held intermediate states, so-called precursor states, is one of the most important. The kinetics of precursor-mediated adsorption ...

    Abstract Among the many concepts which have been developed in surface science to explain the nature of adsorption, the role of weakly-held intermediate states, so-called precursor states, is one of the most important. The kinetics of precursor-mediated adsorption is described, together with examples showing how significant such effects can be, not just in adsorption itself, but also in surface reactions on crystals and on model-supported catalysts.
    MeSH term(s) Adsorption ; Algorithms ; Carbon Monoxide/chemistry ; Catalysis ; Copper/chemistry ; Diffusion ; Formates/chemistry ; Kinetics ; Pressure ; Surface Properties ; Temperature
    Chemical Substances Formates ; formic acid (0YIW783RG1) ; Copper (789U1901C5) ; Carbon Monoxide (7U1EE4V452)
    Language English
    Publishing date 2010-07-07
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 1472968-4
    ISSN 1361-648X ; 0953-8984
    ISSN (online) 1361-648X
    ISSN 0953-8984
    DOI 10.1088/0953-8984/22/26/263002
    Database MEDical Literature Analysis and Retrieval System OnLINE

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