Study of Oxygen Adsorption on Ag/α-Al2O3 Catalysts under Ultrahigh/High Vacuum Conditions Full article
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Kinetics and Catalysis
ISSN: 0023-1584 , E-ISSN: 1608-3210 |
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| Output data | Year: 1997, Volume: 38, Number: 4, Pages: 565-573 Pages count : 9 | ||
| Tags | SILVER SURFACE; PARTIAL OXIDATION; SUPPORTED SILVER; SINGLE-CRYSTAL; DESORPTION; CHEMISTRY; ETHYLENE; AG(111); AG; PARTICLES | ||
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Abstract:
Adsorption of oxygen on Ag/alpha-Al2O3 catalysts with mean sizes of silver particles of 160, 560, and 1000 Angstrom is studied by thermal desorption at 300-500 K and pressures below 10(-2) Pa and in the range 500-15 000 Pa. It is found that for both initial catalysts and those activated under the conditions for ethylene epoxidation, several forms of oxygen thermal desorption are observed: molecular (T-max = 350-400 K), atomic (560-580, 700 K), and the form caused by the penetration of oxygen into subsurface layers (610-630 K). The kinetics and parameters of oxygen adsorption on small particles qualitatively and quantitatively differ from those on the species of a large size. A kinetic scheme that explains the temperature dependence of the initial sticking coefficient of oxygen is suggested for the dissociative adsorption of oxygen. The amount of molecular oxygen adsorbed can be considered as a measure of defects (roundness) on the surface of silver particles.
Cite:
Trukhan S.N.
, Ivanov V.P.
, Balʹzhinimaev B.S.
Study of Oxygen Adsorption on Ag/α-Al2O3 Catalysts under Ultrahigh/High Vacuum Conditions
Kinetics and Catalysis. 1997. V.38. N4. P.565-573. WOS Scopus РИНЦ ANCAN
Study of Oxygen Adsorption on Ag/α-Al2O3 Catalysts under Ultrahigh/High Vacuum Conditions
Kinetics and Catalysis. 1997. V.38. N4. P.565-573. WOS Scopus РИНЦ ANCAN
Original:
Трухан С.Н.
, Иванов В.П.
, Бальжинимаев Б.С.
Изучение адсорбции кислорода на катализаторах Ag/α-Al2O3 в условиях сверхвысокого/высокого вакуума
Кинетика и катализ. 1997. Т.38. №4. С.617-625. РИНЦ
Изучение адсорбции кислорода на катализаторах Ag/α-Al2O3 в условиях сверхвысокого/высокого вакуума
Кинетика и катализ. 1997. Т.38. №4. С.617-625. РИНЦ
Dates:
| Submitted: | Mar 18, 1996 |
Identifiers:
| Web of science: | WOS:A1997XU99700019 |
| Scopus: | 2-s2.0-0642335870 |
| Elibrary: | 13268175 |
| Chemical Abstracts: | 1997:597183 |
| Chemical Abstracts (print): | 127:196041 |