Role of Different Active Sites in Heterogeneous Alkene Hydrogenation on Platinum Catalysts Revealed by Means of Parahydrogen-Induced Polarization Full article
| Journal |
The Journal of Physical Chemistry C
ISSN: 1932-7447 , E-ISSN: 1932-7455 |
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| Output data | Year: 2011, Volume: 115, Number: 27, Pages: 13386-13391 Pages count : 6 DOI: 10.1021/jp203398j | ||||
| Tags | Catalyst activity; Catalyst selectivity; Hydrogenation; Molecules; Platinum; Polarization; Propylene; Silicon compounds; Titanium dioxide | ||||
| Authors |
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| Affiliations |
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Funding (9)
| 1 | Russian Foundation for Basic Research | 11-03-00248 |
| 2 | Russian Foundation for Basic Research | 11-03-93995 |
| 3 | Siberian Branch of the Russian Academy of Sciences | 9 |
| 4 | Siberian Branch of the Russian Academy of Sciences | 67 |
| 5 | Siberian Branch of the Russian Academy of Sciences | 88 |
| 6 | The Ministry of Education and Science of the Russian Federation | 02.740.11.0262 |
| 7 | Президиум РАН | 5.1.1 |
| 8 | Council for Grants of the President of the Russian Federation | МК-1284.2010.3 |
| 9 | Council for Grants of the President of the Russian Federation | НШ-7643.2010.3 |
Abstract:
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.
Cite:
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 ANCAN 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 ANCAN OpenAlex
Dates:
| Submitted: | Apr 12, 2011 |
| Published online: | Jun 20, 2011 |
| Published print: | Jul 14, 2011 |
Identifiers:
| Web of science: | WOS:000292479700034 |
| Scopus: | 2-s2.0-80053912637 |
| Elibrary: | 18008773 |
| Chemical Abstracts: | 2011:766442 |
| Chemical Abstracts (print): | 155:93432 |
| OpenAlex: | W2328653033 |