Does the Zn2+ Species Introduced into H-ZSM-5 Zeolite Affect the Strength of Brønsted Acid Sites? | Sciact - CRIS-система Института катализа

Does the Zn2+ Species Introduced into H-ZSM-5 Zeolite Affect the Strength of Brønsted Acid Sites? Научная публикация

Журнал

ChemCatChem
ISSN: 1867-3880 , E-ISSN: 1867-3899

Вых. Данные

Год: 2020, Том: 12, Номер: 2, Страницы: 478-487 Страниц : 10 DOI: 10.1002/cctc.201901637

Ключевые слова

Brønsted acid sites; FTIR spectroscopy; solid-state NMR; zeolite; zinc

Авторы

Gabrienko Anton A. ^1,2 , Danilova Irina G. ¹ , Arzumanov Sergei S. ^1,2 , Freude Dieter ³ , Stepanov Alexander G. ^1,2

Организации

1	Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences
2	Faculty of Natural Science, Department of Physical Chemistry, Novosibirsk State University
3	Fakultät für Physik und Geowissenschaften, Universität Leipzig

Информация о финансировании (2)

1	Федеральное агентство научных организаций России	0303-2016-0003
2	Российский фонд фундаментальных исследований	18-03-00189

To clarify the issue on Brønsted acidity enhancement by the presence of zinc species in H-ZSM-5 zeolite (G.D. Qi, et al., Angew. Chem.-Int. Edit. 2016 , 55 , 15826), the influence of Zn2+ cationic species, introduced into the zeolite, on the strength of Brønsted acid sites (BAS) has been analyzed by solid-state NMR and FTIR techniques using trimethylphosphine (TMP) and CO as probe molecules. Comparative analysis of the acidity for H-ZSM-5 and Zn2+/H-ZSM-5 zeolites has been performed. TMP adsorbed on both zeolite samples exhibits same signals at 6.3 and –4.5 ppm in 1 H and 31 P MAS NMR spectra, respectively, assigned to protonated TMP. FTIR spectroscopy has shown that both zeolite samples, H-ZSM-5 and Zn 2+ /H-ZSM-5, display the same red frequency shift (Δν OH…CO = –318 cm –1 ) of the O–H stretching band and the same blue frequency shift (Δν CO = +32 cm –1 ) of the CO stretching band for CO adsorption complex with BAS. The results obtained do not provide any evidence for the existence of some specific BAS with enhanced acid strength for Zn2+ -exchanged zeolite compared to the strength inherent to pure acid form zeolite. It is thus inferred the strength of BAS in H-ZSM-5 zeolite is not affected by the modification of the zeolite with Zn2+ cationic species.

Gabrienko A.A. , Danilova I.G. , Arzumanov S.S. , Freude D. , Stepanov A.G.
Does the Zn2+ Species Introduced into H-ZSM-5 Zeolite Affect the Strength of Brønsted Acid Sites?
ChemCatChem. 2020. V.12. N2. P.478-487. DOI: 10.1002/cctc.201901637 WOS Scopus РИНЦ CAPlusCA OpenAlex

Поступила в редакцию:	30 авг. 2019 г.
Принята к публикации:	23 сент. 2019 г.
Опубликована online:	31 окт. 2019 г.
Опубликована в печати:	18 янв. 2020 г.

Web of science:	WOS:000508685300010
Scopus:	2-s2.0-85074781925
РИНЦ:	43211091
Chemical Abstracts:	2019:2068614
Chemical Abstracts (print):	172:134020
OpenAlex:	W2976793929

БД	Цитирований
Scopus	15
РИНЦ	11
Web of science	14
OpenAlex	16