Structural Properties of Pd Catalysts Supported on Al2O3-La2O3 Pepared by Sol-Gel Method Научная публикация
Журнал |
Applied Catalysis B: Environmental
ISSN: 0926-3373 , E-ISSN: 1873-3883 |
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Вых. Данные | Год: 1998, Том: 17, Номер: 3, Страницы: 221-231 Страниц : 11 DOI: 10.1016/S0926-3373(98)00010-1 | ||||||||
Ключевые слова | HRTEM, NH3 production, Pd/Al2O3-La2O3 catalysts, Sol-gel preparation method, XPS, XRD | ||||||||
Авторы |
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Организации |
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Информация о финансировании (2)
1 | National Autonomous University of Mexico | 930286 |
2 | National Autonomous University of Mexico | 25381-A |
Реферат:
The structure of palladium catalysts (0.3 wt% Pd), supported on sol–gel alumina–lanthana mixed oxides, was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS). The investigation of the structure of lanthana-promoted Pd catalysts, prepared by different methods, is of great importance for the improvement of palladium-only three-way catalysts. The data obtained show the presence of a crystalline phase, different from alumina, lanthana or alumina–lanthana reported compounds, in Al2O3–La2O3 and Pd/Al2O3–La2O3. Attempts to assign this crystalline phase to a known one were unsuccessful. According to XPS data, in lanthanum-containing samples, the state of lanthanum is different from that in La2O3. After calcination in air at 1273 K for 3 h this phase vanishes and large crystals of LaAlO3, metastable for studied composition, appear. The sol–gel preparation method, in comparison with traditional preparation methods, leads to stabilization of LaAlO3 phase under the considered conditions and the increase of the stability of γ-Al2O3 phase at high temperature. The improvement of the catalytic activity at medium temperature and the increase of the selectivity to NH3 at high temperatures for lanthanum-promoted Pd catalyst are ascribed to a lanthanum-containing phase. The increase in NH3 production decreases its practical value for an NO reduction catalyst.
Библиографическая ссылка:
Bogdanchikova N.E.
, Fuentes S.
, Avalos-Borja M.
, Farı́as M.H.
, Boronin A.
, Dı́az G.
Structural Properties of Pd Catalysts Supported on Al2O3-La2O3 Pepared by Sol-Gel Method
Applied Catalysis B: Environmental. 1998. V.17. N3. P.221-231. DOI: 10.1016/S0926-3373(98)00010-1 WOS Scopus РИНЦ
Structural Properties of Pd Catalysts Supported on Al2O3-La2O3 Pepared by Sol-Gel Method
Applied Catalysis B: Environmental. 1998. V.17. N3. P.221-231. DOI: 10.1016/S0926-3373(98)00010-1 WOS Scopus РИНЦ
Даты:
Поступила в редакцию: | 15 окт. 1997 г. |
Принята к публикации: | 16 янв. 1998 г. |
Опубликована online: | 25 июн. 1998 г. |
Опубликована в печати: | 13 июл. 1998 г. |
Идентификаторы БД:
Web of science | WOS:000074508300005 |
Scopus | 2-s2.0-0032514098 |
РИНЦ | 13286102 |
Chemical Abstracts | 1998:323012 |
Chemical Abstracts (print) | 129:57944 |
OpenAlex | W2162787747 |