Cu-ZSM-5 Catalyst Synthesis via Ion-Exchange with Ammonia Solution of Copper Hydroxysalts Научная публикация
| Журнал |
Microporous and Mesoporous Materials
ISSN: 1387-1811 , E-ISSN: 1873-3093 |
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| Вых. Данные | Год: 2024, Том: 367, Номер статьи : 112966, Страниц : 19 DOI: 10.1016/j.micromeso.2023.112966 | ||
| Ключевые слова | Cu-ZSM-5; Copper-ammonia complex; Copper dihydroxycarbonate; Copper trihydroxynitrate; DeNOx | ||
| Авторы |
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| Организации |
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Информация о финансировании (1)
| 1 | Министерство науки и высшего образования Российской Федерации (с 15 мая 2018) | FWUR-2024-0033 |
Реферат:
The properties of dihydroxycarbonate (malachite) and trihydroxynitrate of copper were studied in order to apply their ammonia solutions for the synthesis of copper-substituted ZSM-5 zeolites. Copper concentration and NH4OH/Cu2+ ratio in the solutions varied 1–12 g/l and 6–30, respectively. The parameters of Langmuir, Freundlich, Dubinin-Radushkevich, and Temkin isotherms revealed the favorability of the chosen conditions and the chemical nature of [Cu(NH3)n]2+ ions sorption by zeolite. For both copper salts, the sorption capacity of H-ZSM-5 for Cu2+ ions was higher in the solutions having NH4OH/Cu2+ = 6–10 compared to 30. To identify the synthesis and structure – activity relationship correlations, the ammonia solution and Cu-ZSM-5 samples were characterized by EPR, UV–visible spectroscopy, temperature-programmed reduction by hydrogen (H2-TPR). The calcined Cu-ZSM-5 samples produced at NH4OH/Cu2+ = 6–30 contained two types of the isolated Cu2+ ions (bare Cu2+ and [Cu(OH)]+), differing in their Redox properties. Their reducibility improved with an increase in the copper loading and with a decrease in NH4OH/Cu2+. At NH4OH/Cu2+ = 6–10, the samples additionally comprised the structures of Cu2+ ions with extra-lattice oxygen (ELO), which were formed due to hydrolysis of [Cu(NH3)n(H2O)]2+ to [Cu(NH3)n(OH)]+ and then to [Cu(OH)2Cu]2+. Cu2+–ELO structures possessed a greater ability to complete reduction than both types of isolated Cu2+ ions. Correlations with DeNOx properties in selective catalytic reduction (SCR) of NO by propane and ammonia are discussed.
Библиографическая ссылка:
Yashnik S.A.
, Surovtsova T.A.
, Salnikov A.V.
Cu-ZSM-5 Catalyst Synthesis via Ion-Exchange with Ammonia Solution of Copper Hydroxysalts
Microporous and Mesoporous Materials. 2024. V.367. 112966 :1-19. DOI: 10.1016/j.micromeso.2023.112966 WOS Scopus РИНЦ CAPlus OpenAlex
Cu-ZSM-5 Catalyst Synthesis via Ion-Exchange with Ammonia Solution of Copper Hydroxysalts
Microporous and Mesoporous Materials. 2024. V.367. 112966 :1-19. DOI: 10.1016/j.micromeso.2023.112966 WOS Scopus РИНЦ CAPlus OpenAlex
Даты:
| Поступила в редакцию: | 3 окт. 2023 г. |
| Принята к публикации: | 24 дек. 2023 г. |
| Опубликована online: | 29 дек. 2023 г. |
| Опубликована в печати: | 1 мар. 2024 г. |
Идентификаторы БД:
| Web of science: | WOS:001158911000001 |
| Scopus: | 2-s2.0-85182510591 |
| РИНЦ: | 64941323 |
| Chemical Abstracts: | 2024:145335 |
| OpenAlex: | W4390413797 |