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Catalytic and electrical behaviour of Li0.9Ni0.5Co0.5O2−δ below 400°C

Autor: J. R. Walls, Monica Caldararu, A. Ovenston

Publikováno v: Applied Catalysis A: General. 167:225-235

The AC electrical properties of the mixed conducting oxide Li 0.9 Ni 0.5 Co 0.5 O 2− δ at 1592 Hz have been monitored during in-situ temperature programmed exposure to a sequence of dry and/or humid gaseous atmospheres between ambient and 400°C.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::69c723cac4473a026495cbda29526311
https://doi.org/10.1016/s0926-860x(97)00314-1

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Application of in-situ temperature programmed techniques to catalytic oxidation reactions on conducting mixed oxides

Autor: A. Ovenston, J. R. Walls

Publikováno v: Ionics. 3:56-66

A test bed for development of catalysts in a temperature programmed reactor is described. The effluent species are monitored in real time. Such data are collected into spreadsheet arrays which can be interrogated to yield kinetic data. An appropriate

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::acf2fae2147272483b7866b3743d0fe6
https://doi.org/10.1007/bf02375525

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Autor: A. Ovenston, Monica Caldararu, J. R. Walls

Publikováno v: Journal of Materials Science. 32:2895-2902

The a.c. electrical and catalytic properties of YBa2Cu3O7-x have been investigated by in situ dynamic experiments. The data indicate a strong dependence of surface conduction on chemisorbed species which, if loosely bound, cause fluctuations. Proton-

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e2afe814c5ccf01539041b6578f2dcee
https://doi.org/10.1023/a:1018628618206

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Temperature programmed oxidative coupling of methane over a Li-Ni-Co-O catalyst monitoredin-situ by a.c. electrical parameters coupled to multiple-ion monitoring of the product species

Autor: A. Ovenston, D. Qin, J. R. Walls

Publikováno v: Journal of Materials Science. 31:5849-5858

By using the multiple ion-monitoring facility of a quadrupole mass spectrometer, the on-line analysis of species has been studied for temperature programmed methane coupling over a non-stoichiometric mixed oxide Li0.9Ni0.5Co0.5O2−δ catalyst betwee

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f888e4a38930770904822f7e31f63b2e
https://doi.org/10.1007/bf01152132

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Surface dynamics in tin dioxide-containing catalysts III. Catalysis and the surface conductivity of antimony-doped tin dioxide

Autor: D. Sprînceana, Niculae I. Ionescu, J. R. Walls, Monica Caldararu, A. Ovenston

Publikováno v: Applied Catalysis A: General. 141:31-44

The variation of surface conductivity of SnO 2 , Sb 2 O 3 and of antimony-doped tin dioxide in air, argon, propylene-air, and propylene-argon mixtures has been followed in situ between room temperature and 400°C. The apparent p-type behavior of some

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::db3847a39d9254c21aa1adc55944c55a
https://doi.org/10.1016/0926-860x(96)00038-5

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Temperature-programmed CO2 hydrogenation over a Li-Ni-Co-O catalyst monitored in situ by a.c. electrical parameters coupled to multiple-ion monitoring of the product species

Autor: A. Ovenston, J. R. Walls, D. Qin

Publikováno v: Journal of Materials Science. 31:3375-3385

Product analysis with temperature increasing between 573 and 873 K has been studied for carbon dioxide hydrogenation. A non-stoichiometric mixed oxide, Li0.9Ni0.5Co0.5O2−δ was investigated. The exit gas stream was monitored by using the multiple-i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8a79dd6cfa73ef93999ddcddadb25e4c
https://doi.org/10.1007/bf00360737

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The AC monitoring of a mixed conducting Li-Ni-Co-O catalyst during temperature programmed reactions

Autor: J. R. Walls, D. Qin, A. Ovenston

Publikováno v: Ionics. 2:123-131

The temporal analysis of effluent species with temperature linearly increasing with time for two reactions, carbon dioxide hydrogenation (250° to 600°C) and the oxidative coupling of methane (400° to 800°C) have been studied. A non-stoichiometric

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ffbc3bf924dada5c5dc31b63c417cced
https://doi.org/10.1007/bf02375805

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The stability and a.c. electrical characteristics of composites containing YBa2Cu3O7−x and alumina at elevated temperatures

Autor: L. Shields, A. Ovenston, J. R. Walls, D. Qin

Publikováno v: Journal of Materials Science. 30:5405-5414

Samples of a high-temperature superconductor YBa2Cu3O7−x (orthorhombic phase) showed no significant weight loss in nitrogen up to 1173 K; however, differential thermal analysis measurements show that restructuring/decomposition begins around 1121 K

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9a98aef2a9f85afbd24591f077a9080d
https://doi.org/10.1007/bf00351551

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The effect of stoichiometry on the stability and a.c. electrical properties of Li x Ni1−y Co y O2−δ and Li x Ni1−y Co y O2−δ -Al2O3 composites at elevated temperatures

Autor: J. R. Walls, D. Qin, A. Ovenston

Publikováno v: Journal of Materials Science. 30:2496-2506

Polycrystalline samples of LixNi1−yCoyO2−δ(x=0.6, 0.9 and y=0.5, 1, with δ ≪ 1 depending on the stoichiometry) with and without the addition of 50 wt% α-Al2O3 were prepared and examined by XRD, TGA, DTA and a.c. electrical techniques. LixCoO

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c6000ee07e1cd3c4dc05697adf4afe0a
https://doi.org/10.1007/bf00362125

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