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Characterization of Electron-Donor and Electron-Acceptor Sites on the Surface of Sulfated Alumina Using Spin Probes Научная публикация

Журнал The Journal of Physical Chemistry C
ISSN: 1932-7447 , E-ISSN: 1932-7455
Вых. Данные Год: 2014, Том: 118, Номер: 29, Страницы: 15779-15794 Страниц : 16 DOI: 10.1021/jp503523k
Ключевые слова Adsorption; Alumina; Aluminum; Anthracene; Ionization potential; Positive ions; Probes; Sulfur compounds;Toluene
Авторы Bedilo Alexander F. 1,2 , Shuvarakova Ekaterina I. 1,2 , Rybinskaya Alexandra A. 1 , Medvedev Dmitrii A. 1
Организации
1 Boreskov Institute of Catalysis SB RAS, Prospekt Lavrentieva 5, Novosibirsk 630090, Russia
2 Novosibirsk Institute of Technology, Moscow State University of Design and Technology, Krasny Prospekt 35, Novosibirsk 630099, Russia

Информация о финансировании (3)

1 Федеральное агентство научных организаций России V.45.3.2.
2 Российский фонд фундаментальных исследований 12-03-00905
3 Российский фонд фундаментальных исследований 13-03-12227

Реферат: Electron-donor sites on the surface of γ-Al2O3 modified with different amounts of sulfates were characterized using 1,3,5-trinitrobenzene as a spin probe. The concentration of 1,3,5-trinitrobezene radical anions formed on the surface electron-donor sites was found to decrease when the sulfate concentration and the surface acidity increased. Electron-acceptor sites of different strengths were studied using the formation of radical cations after adsorption of donor aromatic molecules with different ionization potentials. Changes in the intensity of the EPR signal observed after adsorption of hexafluorobenzene, toluene, hexamethylbenzene, and anthracene on the surface of sulfated alumina samples with different sulfate concentrations were analyzed. Modification of γ-Al2O3 with sulfates was found to result in the formation of strong electron-acceptor sites capable of ionizing toluene and hexamethylbenzene to their radical cations. Such sites were observed on the samples with the sulfate concentrations 4 wt % or higher. Weak electron-acceptor sites tested using anthracene were present on the surface of pure Al2O3. Their concentration was found to grow substantially when the concentration of sulfates was increased. The intensity of the EPR signal was found to depend on time after adsorption. The mechanisms of processes leading to the formation of the EPR signal attributed to electron-acceptor sites and the possible nature of such sites are discussed. Suggestions concerning the use of spin probes for characterization of electron-acceptor sites are made
Библиографическая ссылка: Bedilo A.F. , Shuvarakova E.I. , Rybinskaya A.A. , Medvedev D.A.
Characterization of Electron-Donor and Electron-Acceptor Sites on the Surface of Sulfated Alumina Using Spin Probes
The Journal of Physical Chemistry C. 2014. V.118. N29. P.15779-15794. DOI: 10.1021/jp503523k WOS Scopus РИНЦ CAPlusCA OpenAlex
Даты:
Поступила в редакцию: 10 апр. 2014 г.
Принята к публикации: 4 июл. 2014 г.
Опубликована online: 14 июл. 2014 г.
Опубликована в печати: 24 июл. 2014 г.
Идентификаторы БД:
Web of science: WOS:000339540700025
Scopus: 2-s2.0-84904962428
РИНЦ: 23623135
Chemical Abstracts: 2014:1110556
Chemical Abstracts (print): 161:238295
OpenAlex: W2312777703
Цитирование в БД:
БД Цитирований
Web of science 31
Scopus 29
РИНЦ 35
OpenAlex 30
Альметрики: