Hydroisomerization of saturated hydrocarbons with novel MCM-41 immobilized Re(V) complex catalysts
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
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