Výsledky vyhledávání - "J. W. Couves"

Experimental verification of a predicted negative thermal expansivity of crystalline zeolites

Autor: Stephen C. Parker, C. R. A. Catlow, P. Tschaufeser, J. W. Couves, Russ H. Jones

Publikováno v: Journal of Physics: Condensed Matter. 5:L329-L332

Computational techniques predict that several microporous zeolitic structures have unusual negative coefficients of thermal expansion. High-resolution powder diffraction techniques confirm the qualitative aspects of these simulations.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::476d7037d138b51b3ad6c6fbfb9c43d2
https://doi.org/10.1088/0953-8984/5/27/001

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ChemInform Abstract: Synthesis and Characterization of a Catalytically Active Nickel-Silicoaluminophosphate Catalyst for the Conversion of Methanol to Ethene

Autor: Y. Xu, J. W. Couves, J. M. Thomas, C. R. A. Catlow

Publikováno v: ChemInform. 22

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4088d1029726371c903d6907711cd5cd
https://doi.org/10.1002/chin.199143028

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Time-resolved energy-dispersive and conventional EXAFS studies of the interactions of nitrous oxide with supported copper catalyst

Autor: J. W. Couves, G. Sankar, G.N. Greaves, C. R. A. Catlow, John Meurig Thomas, David Waller

Publikováno v: The Journal of Physical Chemistry. 96:7485-7489

The basis of the ''N2O method'' of determining the surface area of copper catalyst is quantitatively tested. At temperatures of around 60-degrees-C only a surface monolayer of Cu(I) oxide is formed: this oxide is structurally different from a monolay

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d1d7b6a68a7f86a59167484037002517
https://doi.org/10.1021/j100198a001

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Combined energy dispersive EXAFS and x‐ray diffraction

Autor: G.N. Greaves, Gareth E. Derbyshire, A. J. Dent, John Meurig Thomas, M. P. Wells, J. W. Couves, R. C. Farrow, C. A. Ramsdale

Publikováno v: Review of Scientific Instruments. 63:903-906

An in situ experiment to measure both x‐ray absorption spectroscopy and x‐ray diffraction of aurichalcite is described. The experiment uses position sensitive detectors to enable both data sets to be collected while the sample is slowly decompose

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::90f43d84243d43ce04e4b0c5d3a4791d
https://doi.org/10.1063/1.1143774

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Tracing the conversion of aurichalcite to a copper catalyst by combined X-ray absorption and diffraction

Autor: Andrew J. Dent, Richard H. Jones, J. W. Couves, G. Neville Greaves, David Waller, John Meurig Thomas, Gareth E. Derbyshire

Publikováno v: Nature. 354:465-468

EVER since X-ray sources first became available, the merit of deploying diffraction and absorption spectroscopic studies simultaneously has been acknowledged1. Information on oxidation states and local (~6-A radius) atomic environments is now obtaine

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ee85753666f91ed8546447009edf64c8
https://doi.org/10.1038/354465a0

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Synthesis and characterization of a catalytically active nickel silicoaluminophosphate catalyst for the conversion of methanol to ethene

Autor: Y. Xu, J. W. Couves, C. R. A. Catlow, J. M. Thomas

Publikováno v: Chemistry of Materials. 3:667-672

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::85cf11cda52fe8c7270e258917fd483a
https://doi.org/10.1021/cm00016a020

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A study of cation environment and movement during dehydration and reduction of nickel-exchanged zeolite Y by x-ray absorption and diffraction

Autor: G.N. Greaves, J. W. Couves, P. J. Maddox, A. T. Steel, C. R. A. Catlow, E. Dooryhee, R. P. Townsend, John Meurig Thomas

Publikováno v: The Journal of Physical Chemistry. 95:4514-4521

Using synchrotron radiation, we have monitored, by a combination of extended X-ray absorption fine structure (EXAFS) spectroscopy and high-resolution powder X-ray diffraction (XRD), (1) the location of Ni 2+ ions in the hydrated form of nickel ion ex

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::62464bca8ab8e0b2852623ec486727b5
https://doi.org/10.1021/j100164a062

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X-ray absorption studies of framework-substituted aluminium phosphate and silico-aluminium phosphate molecular sieves: The environment of nickel in NiAPO-5 and NiAPSO-34

Autor: John Meurig Thomas, J. W. Couves, Chen Jiesheng, C. Richard A. Catlow, Xu Yan, G. Neville Greaves, Richard H. Jones

Publikováno v: Journal of Physics and Chemistry of Solids. 52:1229-1234

From extended- and near-edge X-ray absorption measurements on the precursor (hydrothermally synthesized), as-prepared and thermally treated (detemplated) forms of NiAPO-5 and NiAPSO-34, it is established that the transition metal is incorporated into

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::91f1fffc645c6fd7a0f79b8ce982378a
https://doi.org/10.1016/0022-3697(91)90197-8

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Gas–solid interactions studied by quantitative powder X-ray diffraction analysis

Autor: Jarek M. Stachurski, J. W. Couves, David Madill, John Meurig Thomas, Ingrid J. Pickering, Eric Dooryhee, Peter J. Maddox, Michael Sheehy

Publikováno v: J. Chem. Soc., Faraday Trans.. 87:3063-3066

An X-ray diffraction chamber suitable for the simultaneous, quantitative study of solid structure and product composition of stoichiometric and catalytic reactions between solids and gases is described. It may be attached to a conventional or rotatin

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9e2dcee2fc04cc645955ed742377e84a
https://doi.org/10.1039/ft9918703063

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