Zobrazeno 1 - 10
of 25
pro vyhledávání: '"R.K. Usmen"'
Publikováno v:
Sensors and Actuators B: Chemical. 28:139-142
Platinum loading and metal dispersion have been measured in the outer, sensing electrodes of four commercial heated exhaust-gas oxygen (HEGO) sensors which have previously been thoroughly characterized. The Pt dispersion is determined by methanation
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::00ce976c317f29d4f6a0ce7274d26362
https://doi.org/10.1016/0925-4005(95)80039-5
https://doi.org/10.1016/0925-4005(95)80039-5
Publikováno v:
Catalysis Letters. 30:53-63
The effects of La3+ incorporation into a Pt/CeO2/Al2O3 catalyst were investigated by a combination of activity, temperature-programmed reduction (TPR), oxygen storage capacity (OSC), noble-metal surface area, and X-ray diffraction (XRD) measurements.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::831fb0a25fc2e5dace26c8aa26191ea2
https://doi.org/10.1007/bf00813672
https://doi.org/10.1007/bf00813672
Publikováno v:
Applied Surface Science. 72:181-187
X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) have been used to follow the effect of calcination temperature on CeO2 particle size, relative CeO2 concentration, and cerium oxidation state for CeO2 supported on γ-Al2O3. When the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4da34048ef4bb5b4e39d53a1dcc6bdc3
https://doi.org/10.1016/0169-4332(93)90010-9
https://doi.org/10.1016/0169-4332(93)90010-9
Publikováno v:
Catalysis Letters. 17:175-184
X-ray photoelectron spectroscopy measurements indicate that the Ce3+ fraction in Al2O3-supported CeO2 can be decreased by the incorporation of La3+. If La3+ is incorporated into the Al2O3 before CeO2 is added, a higher CeO2 dispersion and a greater r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0d1dde477c4871dc10f1464966e32089
https://doi.org/10.1007/bf00763940
https://doi.org/10.1007/bf00763940
Autor:
R.K. Usmen, L.P. Haack, Robert Walter Mccabe, William Lewis Henderson Watkins, Jeffrey Scott Hepburn, George W. Graham
Publikováno v:
ChemInform. 23
The effects of La[sup 3+] incorporation into Rh/[gamma]-Al[sub 2]O[sub 3] were investigated by a combination of temperature-programmed reduction, X-ray photoelectron spectroscopy, CO chemisorption, and reactivity measurements. The reduction of Rh[sup
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ce3841a5c67dee473ca7752380a4a13a
https://doi.org/10.1002/chin.199229024
https://doi.org/10.1002/chin.199229024
Autor:
Robert Walter Mccabe, William Lewis Henderson Watkins, R.K. Usmen, L.P. Haack, Jeffrey Scott Hepburn, George W. Graham
Publikováno v:
Journal of Catalysis. 134:702-712
The effects of La[sup 3+] incorporation into Rh/[gamma]-Al[sub 2]O[sub 3] were investigated by a combination of temperature-programmed reduction, X-ray photoelectron spectroscopy, CO chemisorption, and reactivity measurements. The reduction of Rh[sup
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0f104b09ee01f157c24d28963fc82b72
https://doi.org/10.1016/0021-9517(92)90354-k
https://doi.org/10.1016/0021-9517(92)90354-k
Autor:
R.K. Usmen, Robert Walter Mccabe
Characterization studies were undertaken to determine the cause of large differences in activity between various commercial automotive catalysts after aging for 75 or 120 h on an accelerated engine-dynamometer cycle. In all, a set of nine catalysts w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c3c452cd4b79a28cc51a976c6573290e
https://doi.org/10.1016/s0167-2991(96)80246-1
https://doi.org/10.1016/s0167-2991(96)80246-1
Autor:
Robert Walter Mccabe, George W. Graham, William Lewis Henderson Watkins, R.K. Usmen, W.G. Rothschild
Modification of alumina by exchange of surface hydroxyl groups with tetraethyl orthosilicate was investigated as a method for preventing interactions between rhodium and alumina in high-temperature (1173 K) oxidizing environments. Temperature-program
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f36ae096f3415713a157bc1c490a4d7c
https://doi.org/10.1016/s0167-2991(06)81442-4
https://doi.org/10.1016/s0167-2991(06)81442-4
The CO chemisorption method of Komai et al. [J. Catal. 120 (1989) 370] , based on methanation of adsorbed CO and chromatographic quantification of the product methane with a flame ionization detector, was used to determine noble metal particle sizes
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::be3f7e4de9d6339dd85450e25bedae85
https://doi.org/10.1016/s0167-2991(06)81475-8
https://doi.org/10.1016/s0167-2991(06)81475-8
Publikováno v:
SAE Technical Paper Series.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f17cc5b0ffc3c434f4c21a2335d0b3f1
https://doi.org/10.4271/933036
https://doi.org/10.4271/933036