Study of the Chemical-State of Ir in Ir/Al2O3 Catalysts by XPS, Low-Angle X-Ray-Scattering, and Electron-Microscopy Techniques Full article
Journal |
Russian Journal of Applied Chemistry
ISSN: 1070-4272 , E-ISSN: 1608-3296 |
||||
---|---|---|---|---|---|
Output data | Year: 1994, Volume: 67, Number: 1-1, Pages: 11-17 Pages count : 7 | ||||
Authors |
|
||||
Affiliations |
|
Abstract:
A study of interaction of iridium with Al2O3 support in Ir/Al2O3 catalysts by x-ray phase analysis, electron microscopy (EM), low-angle x-ray scattering (LAXS), and XPS techniques has shown that various iridium species occur on the surface of the support. A portion of iridium(no more than 3-5%) occurs as Ir-n+ and forms a spinel-like Ir-2(Al2O4)(n) structure with the support. Another portion (Ir-O) is polarized, due to contacts with the first portion, and transforms into Ir-q+. The external surface of iridium crystallite is oxidized by atmospheric oxygen into Ir-m+. Such properties of iridium particles as dispersity and the area contacting with the support are mainly influenced by pore structure of the latter. Any admixtures present in the support may significantly affect the proportions of various iridium species in catalysts.
Cite:
Yurchenko E.N.
, Boronin A.I.
, Gaidei T.P.
Study of the Chemical-State of Ir in Ir/Al2O3 Catalysts by XPS, Low-Angle X-Ray-Scattering, and Electron-Microscopy Techniques
Russian Journal of Applied Chemistry. 1994. V.67. N1-1. P.11-17. WOS РИНЦ
Study of the Chemical-State of Ir in Ir/Al2O3 Catalysts by XPS, Low-Angle X-Ray-Scattering, and Electron-Microscopy Techniques
Russian Journal of Applied Chemistry. 1994. V.67. N1-1. P.11-17. WOS РИНЦ
Original:
Юрченко Э.Н.
, Боронин А.И.
, Гайдей Т.П.
Состояние Ir в катализаторах Ir/Al2O3 по данным спектроскопии РФС, малоуглового рассеяния рентгеновских лучей и электронной микроскопии
Журнал прикладной химии. 1994. Т.67. №1. С.14-20. РИНЦ
Состояние Ir в катализаторах Ir/Al2O3 по данным спектроскопии РФС, малоуглового рассеяния рентгеновских лучей и электронной микроскопии
Журнал прикладной химии. 1994. Т.67. №1. С.14-20. РИНЦ
Dates:
Published print: | Jan 1, 1994 |
Identifiers:
Web of science | WOS:A1994QB03200003 |
Elibrary | 31040299 |
Citing:
DB | Citing |
---|---|
Elibrary | 1 |