Sciact
  • EN
  • RU

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
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 Zhivonitko Vladimir V. 1 , Kovtunov Kirill V. 1 , Bekk Irene E. 2 , Ayupov Artem B. 2 , Bukhtiyarov Valerii I. 2 , Koptyug Igor V. 1
Affiliations
1 International Tomography Center, Siberian Branch of the Russian Academy of Sciences (SB RAS), Institutskaya Street 3A, 630090 Novosibirsk, Russia
2 Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences (SB RAS), Lavrentieva Avenue 5, 630090 Novosibirsk, Russia

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
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
Citing:
DB Citing
Web of science 68
Scopus 70
Elibrary 68
OpenAlex 72
Altmetrics: