|
authors |
Mishra, GS; Kumar, A |
|
nationality |
International |
|
journal |
APPLIED CATALYSIS A-GENERAL |
|
author keywords |
Modified MCM-41; Re-complex; Immobilization; Hydroisomerization; n-Alkane |
|
keywords |
MODIFIED SILICA-GEL; N-HEXANE; RHENIUM(I) COMPLEXES; ISOMERIZATION; MECHANISM; REFORMATION; PARAFFINS; LIGANDS; ALKANES; HEPTANE |
|
abstract |
The hetero-functionalized phosphines HPN2. H2PNO and HPN-Pip containing tricarbonyl Re(V) complexes, i.e. [Re(CO)(3)(kappa(3)-PN2)] (I), [Re(CO)(3)Br(kappa(2)-H2PNO)] (II) and [Re(CO)(3)Br(kappa(2)-HPN-Pip)] (III) were covalently bonded to modified and MCM-41 to obtain novel supported hybrid catalysts. Remarkable high catalytic effects were observed with these catalysts in the hydroisomerization of n-alkanes at low temperature. The catalyst II/MCM-41 provided the highest TONs 3.32 x 10(3) with 37% yield for n-hexane and 3.18 x 10(3) with 30% yield for n-heptane. Under optimized condition, good selectivities for n-hexane (85%) and for n-heptane (91%) were obtained. The TGA was used to evaluate the stability of catalysts and reusable for several cycles. A possible carbenium-based mechanism been used to explain product formation. (C) 2012 Elsevier B.V. All rights reserved. |
|
publisher |
ELSEVIER SCIENCE BV |
|
issn |
0926-860X |
|
year published |
2012 |
|
volume |
429 |
|
beginning page |
1 |
|
ending page |
8 |
|
digital object identifier (doi) |
10.1016/j.apcata.2012.03.018 |
|
web of science category |
Chemistry, Physical; Environmental Sciences |
|
subject category |
Chemistry; Environmental Sciences & Ecology |
|
unique article identifier |
WOS:000304899400001
|
