Properties of Iron-Modified-by-Silver Supported on Mordenite as Catalysts for NOx Reduction Научная публикация
Журнал |
Catalysts
ISSN: 2073-4344 |
||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Вых. Данные | Год: 2020, Том: 10, Номер: 10, Номер статьи : 1156, Страниц : 17 DOI: 10.3390/catal10101156 | ||||||||||
Ключевые слова | iron; silver; mordenite; bimetallic; deposition order; ion exchange; de-NOx | ||||||||||
Авторы |
|
||||||||||
Организации |
|
Информация о финансировании (3)
1 | Министерство науки и высшего образования Российской Федерации | 0239-2019-0003 |
2 | National Council of Science and Technology | 117373 |
3 | National Polytechnic Institute |
Реферат:
A series of mono and bimetallic catalysts based on a Fe-Ag mixture deposited on mordenite was prepared by ion-exchange and evaluated in the catalytic activity test of the de-NOx reaction in the presence of CO/C3H6. The activity results showed that the most active samples were the Fe-containing ones, and at high temperatures, a co-promoter eect of Ag on the activity of Fe catalysts was also observed. The influence of the order of cation deposition on catalysts formation and their physicochemical properties was studied by FTIR (Fourier Transform Infrared Spectroscopy)
of adsorbed NO, XANES (X-ray Absorption Near-Edge Structure), and EXAFS (Extended X-ray Absorption Fine Structure) and discussed in terms of the state of iron. Results of Fe K-edge XANES oscillations showed that, in FeMOR catalysts, iron was present in a disordered state as Fe3+ and Fe2+. In FeAgMOR, the prevailing species was Fe3+, while in the AgFeMOR catalyst, the state of iron was intermediate or mixed between FeMOR and FeAgMOR. The Fe K-edge EXAFS results were characteristic of a disordered phase, the first coordination sphere being asymmetric with two dierent
Fe-O distances. In FeAgMOR and AgFeMOR, coordination of Fe-O was similar to Fe2O3 with a few amount of Fe2+ species. We may conclude that, in the bimetallic FeAgMOR and AgFeMOR samples, a certain amount of tetrahedral Al3+ ions in the mordenite framework is replaced by Fe3+ ions, confirming the previous reports that these species are active sites for the de-NOx reaction. Based on the thermodynamic analysis and experimental data, also, it was confirmed that the order of deposition of the components influenced the mechanism of active sites’ formation during the two
steps ion-exchange synthesis.
Библиографическая ссылка:
Sánchez-López P.
, Kotolevich Y.
, Khramov E.
, Chowdari R.K.
, Estrada M.A.
, Berlier G.
, Zubavichus Y.
, Fuentes S.
, Petranovskii V.
, Chávez-Rivas F.
Properties of Iron-Modified-by-Silver Supported on Mordenite as Catalysts for NOx Reduction
Catalysts. 2020. V.10. N10. 1156 :1-17. DOI: 10.3390/catal10101156 WOS Scopus РИНЦ
Properties of Iron-Modified-by-Silver Supported on Mordenite as Catalysts for NOx Reduction
Catalysts. 2020. V.10. N10. 1156 :1-17. DOI: 10.3390/catal10101156 WOS Scopus РИНЦ
Файлы:
Полный текст от издателя
Даты:
Поступила в редакцию: | 31 авг. 2020 г. |
Принята к публикации: | 16 сент. 2020 г. |
Опубликована в печати: | 9 окт. 2020 г. |
Опубликована online: | 9 окт. 2020 г. |
Идентификаторы БД:
Web of science | WOS:000584028800001 |
Scopus | 2-s2.0-85092366890 |
РИНЦ | 45238508 |
Chemical Abstracts | 2020:2194683 |
OpenAlex | W3092004259 |