Quantitative 67Zn, 27Al and 1H MAS NMR Spectroscopy for the Characterization of Zn Species in ZSM-5 Catalysts Научная публикация
Журнал |
PCCP: Physical Chemistry Chemical Physics
ISSN: 1463-9076 , E-ISSN: 1463-9084 |
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Вых. Данные | Год: 2023, Том: 25, Номер: 41, Страницы: 28043-28051 Страниц : 9 DOI: 10.1039/d3cp03136e | ||||
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Организации |
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Информация о финансировании (2)
1 | German Research Foundation | HA 1893/22-1 |
2 | Министерство науки и высшего образования Российской Федерации (с 15 мая 2018) | 0239-2021-0003 |
Реферат:
67 Zn MAS NMR spectroscopy was used to characterize the state of Zn in Zn-modified zeolites ZSM-5. Two 67Zn enriched zeolite samples were prepared: by solid-state exchange with metal 67Zn (Zn2+/ZSM-5 sample) and by ion exchange with zinc formate solution (ZnO/H-ZSM-5 sample), both containing ca. 3.8 wt% Zn. The elemental analysis, TEM, and quantitative BAS and aluminum analyses with 1H and 27Al MAS NMR have shown that Zn2+/ZSM-5 contains zinc in the form of Zn2+ cations, while both ZnO species and Zn2+ cations are present in ZnO/H-ZSM-5 besides BAS. 67Zn MAS NMR has detected the signal of Zn in a tetrahedral environment from ZnO species for both the activated and hydrated ZnO/H-ZSM-5 zeolite. The signal of Zn in an octahedral environment was detected for the hydrated Zn2+/ZSM-5 and ZnO/H-ZSM-5 zeolites. This signal may belong to zinc cation [HOZn]+ or Zn(OH)2 species surrounded by water molecules. Quantitative 67Zn MAS NMR analysis has shown that only 27 and 38% of zinc loaded in the zeolite is visible for the activated and hydrated ZnO/H-ZSM-5 zeolite, and 24% of Zn is visible for the hydrated Zn2+/ZSM-5. Zinc in the form of ZnO species is entirely visible in both the activated and hydrated ZnO/H-ZSM-5 zeolite, while Zn2+ cations are not detected at all for the activated sample and only 29% of Zn2+ cations is visible for the hydrated zeolite. Detection of only a part of Zn2+ cations in the form of [HOZn]+ or Zn(OH)2 species in octahedral environment presumes only partial hydrolysis of the bond of Zn2+ cation with framework oxygen and further solvation of the Zn species formed at hydrolysis by the adsorbed water.
Библиографическая ссылка:
Avramovska M.
, Freude D.
, Haase J.
, Toktarev A.V.
, Arzumanov S.S.
, Gabrienko A.A.
, Stepanov A.G.
Quantitative 67Zn, 27Al and 1H MAS NMR Spectroscopy for the Characterization of Zn Species in ZSM-5 Catalysts
PCCP: Physical Chemistry Chemical Physics. 2023. V.25. N41. P.28043-28051. DOI: 10.1039/d3cp03136e WOS Scopus РИНЦ CAPlus PMID OpenAlex
Quantitative 67Zn, 27Al and 1H MAS NMR Spectroscopy for the Characterization of Zn Species in ZSM-5 Catalysts
PCCP: Physical Chemistry Chemical Physics. 2023. V.25. N41. P.28043-28051. DOI: 10.1039/d3cp03136e WOS Scopus РИНЦ CAPlus PMID OpenAlex
Даты:
Поступила в редакцию: | 4 июл. 2023 г. |
Принята к публикации: | 10 окт. 2023 г. |
Опубликована online: | 10 окт. 2023 г. |
Опубликована в печати: | 7 нояб. 2023 г. |
Идентификаторы БД:
Web of science: | WOS:001086988500001 |
Scopus: | 2-s2.0-85175231729 |
РИНЦ: | 55291292 |
Chemical Abstracts: | 2023:2137801 |
PMID (PubMed): | 37847194 |
OpenAlex: | W4387479113 |