Influence of Zr Ions on the Properties of Pd Supported on Graphite and Diamond Научная публикация
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Journal of Molecular Catalysis
ISSN: 0304-5102 |
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| Вых. Данные | Год: 1991, Том: 68, Номер: 3, Страницы: 355-370 Страниц : 16 DOI: 10.1016/0304-5102(91)80093-I | ||
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Реферат:
FTIR, TEM and XPS methods have been applied to study the formation, dispersion, electronic and catalytic properties of the (Pd+Zr)/C system obtained by consecutive anchoring of (π-C3H5)4Zr and C3H5PdC5H5 on the surface of oxidized graphite and diamond. The interaction of (π-C3H5)4Zr with the surface of oxidized diamond proceeds with participation of carboxyl groups of the support, and the supported Pd complex then seems to be coordinated with anchored Zr ions. According to the XPS data, Zr in the reduced (Pd+Zr)/C catalysts is found in oxidized states and Pd in metallic states. The size of Pd particles in (Pd+Zr)/C catalysts reduced in mild conditions ranges from 10 to 20 Å. Pd sintering over graphite proceeds more rapidly compared to diamond.
The introduction of Zr ions to Pd/C results in the following effects: appearance of a new absorption band at 1600 cm−1 in the spectrum of adsorbed CO, increase in the specific activity in methanol synthesis by 1–2 orders of magnitude but a drastic decrease in the specific activity in ethane hydrogenolysis, while high temperature oxidation of the samples completely eliminates the inhibitory action of Zr ions. These peculiarities are similar to those previously observed for (Pd+Zr)/SiO2 as well as for Pd/ZrO2, and are likely to be due to mixed Pd-Zrn+ active sites formed in the systems.
Библиографическая ссылка:
Ryndin Y.A.
, Alekseev O.S.
, Paukshtis E.A.
, Zaikovskii V.I.
, Kalinkin A.V.
Influence of Zr Ions on the Properties of Pd Supported on Graphite and Diamond
Journal of Molecular Catalysis. 1991. V.68. N3. P.355-370. DOI: 10.1016/0304-5102(91)80093-I WOS Scopus РИНЦ CAPlusCA OpenAlex Sciact
Influence of Zr Ions on the Properties of Pd Supported on Graphite and Diamond
Journal of Molecular Catalysis. 1991. V.68. N3. P.355-370. DOI: 10.1016/0304-5102(91)80093-I WOS Scopus РИНЦ CAPlusCA OpenAlex Sciact
Даты:
| Поступила в редакцию: | 26 дек. 1990 г. |
| Принята к публикации: | 6 мар. 1991 г. |
| Опубликована в печати: | 15 сент. 1991 г. |
| Опубликована online: | 2 окт. 2001 г. |
Идентификаторы БД:
| Web of science: | WOS:A1991GH16600013 |
| Scopus: | 2-s2.0-0026218762 |
| РИНЦ: | 31077514 |
| Chemical Abstracts: | 1991:631623 |
| Chemical Abstracts (print): | 115:231623 |
| OpenAlex: | W1969683470 |
| Sciact: | 12855 |