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Obtaining 1‐heptene from 1‐heptyne semihydrogenation with an anchored rhodium complex on different supports as catalyst
Author(s) -
Quiroga Mónica,
Liprandi Domingo,
L'Argentière Pablo,
Cagnola Edgardo
Publication year - 2005
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.1168
Subject(s) - rhodium , catalysis , heptene , selectivity , chemistry , x ray photoelectron spectroscopy , homogeneous , palladium , substrate (aquarium) , fourier transform infrared spectroscopy , metal , chemical engineering , organic chemistry , physics , oceanography , engineering , thermodynamics , geology
The complex [RhCl(NH 2 (CH 2 ) 12 CH 3 ) 3 ] was tested for the semihydrogenation of 1‐heptyne in homogeneous and heterogeneous conditions. γ‐Al 2 O 3 and two different commercial activated carbons (RX‐3 EXTRA and GF‐45) were used as supports. The results were, then, compared with those previously reported for the [PdCl 2 (NH 2 (CH 2 ) 12 CH 3 ) 2 ] complex supported or unsupported, and with the results obtained with the classic Lindlar catalyst. The complex was characterised by FTIR and elemental analysis. The pure species and the supported one were also characterised by X‐ray photoelectron spectroscopy. Results determined by the latter technique suggest that the active species is the complex itself, which is stable under the reaction conditions. The supported rhodium tetra‐coordinated complex shows higher activity and selectivity than the same complex unsupported, and also than the classic Lindlar catalyst. Moreover, among the rhodium‐supported complexes the one immobilised on RX‐3 EXTRA has a better performance than that heterogenised on GF‐45, and this one has a better activity and selectivity than the γ‐Al 2 O 3 anchored complex. Our results also show that under the same operational conditions (temperature, hydrogen pressure and metal/substrate weight ratio) the rhodium complex, unsupported or supported, has a better performance than the corresponding palladium complex. Copyright © 2004 Society of Chemical Industry