Regioselective H/D Exchange of Propane on Zn/H-MFI Zeolite
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Original
|
| Journal |
Catalysis Letters
ISSN: 1011-372X
, E-ISSN: 1572-879X
|
| Output data |
Year: 2007,
Volume: 114,
Number: 1-2,
Pages: 85-90
Pages count
: 6
DOI:
10.1007/s10562-007-9044-6
|
| Tags |
H/D exchange, In situ 1H MAS NMR spectroscopy, Kinetics, Mechanism, Propane, Zn/H-MFI zeolite |
| Authors |
Stepanov A.G.
1
,
Arzumanov S.S.
1
,
Parmon V.N.
1
,
Kolyagin Y.G.
2
,
Ivanova I.I.
2
,
Freude D.
3
|
| Affiliations |
| 1 |
Boreskov Institute of Catalysis SB RAS
|
| 2 |
Lomonosov Moscow State University
|
| 3 |
Universität Leipzig
|
|
Funding (4)
|
1
|
German Research Foundation
|
FR 902/15
|
|
2
|
Russian Foundation for Basic Research
|
04-03-32372
|
|
3
|
International Association for the Promotion of Co-operation with Scientists from the New Independent States of the Former Soviet Union
|
03-51-5286
|
|
4
|
Russian Foundation for Basic Research
|
06-03-32914
|
The hydrogen exchange for propane-d8 adsorbed on zeolite Zn/H-MFI has been studied by1H MAS NMR spectroscopy in situ within the temperature range of 420–490 K. Kinetic measurements of the H/D exchange between the acidic hydroxyl groups of the zeolite and the adsorbed deuterated propane molecules show that only methyl groups of the alkane are involved in the exchange. Two mechanisms are proposed to rationalize the regioselectivity of the exchange: (i) propane dehydrogenation on Zn-sites followed by protonation of propene by acidic OH groups in accordance to the Markovnikov’s rule and abstraction of deuteride ion from another propane molecule; (ii) the reversible heterolytic dissociative adsorption of propane to form Zn-propyl species and acidic OH groups.