Role of Different Active Sites in Heterogeneous Alkene Hydrogenation on Platinum Catalysts Revealed by Means of Parahydrogen-Induced Polarization Научная публикация
| Журнал |
The Journal of Physical Chemistry C
ISSN: 1932-7447 , E-ISSN: 1932-7455 |
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| Вых. Данные | Год: 2011, Том: 115, Номер: 27, Страницы: 13386-13391 Страниц : 6 DOI: 10.1021/jp203398j | ||||
| Ключевые слова | Catalyst activity; Catalyst selectivity; Hydrogenation; Molecules; Platinum; Polarization; Propylene; Silicon compounds; Titanium dioxide | ||||
| Авторы |
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| Организации |
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Информация о финансировании (9)
| 1 | Российский фонд фундаментальных исследований | 11-03-00248 |
| 2 | Российский фонд фундаментальных исследований | 11-03-93995 |
| 3 | Сибирское отделение Российской академии наук | 9 |
| 4 | Сибирское отделение Российской академии наук | 67 |
| 5 | Сибирское отделение Российской академии наук | 88 |
| 6 | Министерство образования и науки Российской Федерации | 02.740.11.0262 |
| 7 | Президиум РАН | 5.1.1 |
| 8 | Совет по грантам Президента Российской Федерации | МК-1284.2010.3 |
| 9 | Совет по грантам Президента Российской Федерации | НШ-7643.2010.3 |
Реферат:
Substantial NMR signal enhancements provided by parahydrogen-induced polarization (PHIP) are associated with the ability of a catalyst to incorporate both H atoms of a dihydrogen molecule into the same product molecule. Therefore, PHIP can provide valuable information about the mechanisms and kinetics of catalytic hydrogenation reactions as well as produce hyperpolarized molecules for sensitivity enhancement in NMR. In this work, the PHIP technique was applied to study the structure sensitivity and the support effects on the degree of pairwise H2 addition in propene hydrogenation over supported platinum catalysts. Four series of Pt catalysts supported on Al2O3, SiO2, ZrO2, and TiO2 were examined. A nontrivial dependence of the selectivity toward pairwise H2 addition on the Pt particle size was found. Its analysis indicates that at least three types of different active sites coexist on the catalysts surface. Among them, the major one is responsible for the nonpairwise H2 addition to the double bond, whereas pairwise addition can proceed on the other two minor active sites. An explanation of the nature of these active sites is proposed. A substantial increase in the pairwise addition selectivity was found for Pt/TiO2 catalysts as compared to other catalyst series, possibly due to a strong metal–support interaction taking place even after low temperature catalyst reduction.
Библиографическая ссылка:
Zhivonitko V.V.
, Kovtunov K.V.
, Bekk I.E.
, Ayupov A.B.
, Bukhtiyarov V.I.
, Koptyug I.V.
Role of Different Active Sites in Heterogeneous Alkene Hydrogenation on Platinum Catalysts Revealed by Means of Parahydrogen-Induced Polarization
The Journal of Physical Chemistry C. 2011. V.115. N27. P.13386-13391. DOI: 10.1021/jp203398j WOS Scopus РИНЦ CAPlusCA OpenAlex
Role of Different Active Sites in Heterogeneous Alkene Hydrogenation on Platinum Catalysts Revealed by Means of Parahydrogen-Induced Polarization
The Journal of Physical Chemistry C. 2011. V.115. N27. P.13386-13391. DOI: 10.1021/jp203398j WOS Scopus РИНЦ CAPlusCA OpenAlex
Даты:
| Поступила в редакцию: | 12 апр. 2011 г. |
| Опубликована online: | 20 июн. 2011 г. |
| Опубликована в печати: | 14 июл. 2011 г. |
Идентификаторы БД:
| Web of science: | WOS:000292479700034 |
| Scopus: | 2-s2.0-80053912637 |
| РИНЦ: | 18008773 |
| Chemical Abstracts: | 2011:766442 |
| Chemical Abstracts (print): | 155:93432 |
| OpenAlex: | W2328653033 |