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Correlating the role of hydrophilic/hydrophobic nature of Rh(I) and Ru(II) supported organosilica/silica catalysts in organotransformation reactions

Paper ID Volume ID Publish Year Pages File Format Full-Text
38853 45793 2016 9 PDF Available
Title
Correlating the role of hydrophilic/hydrophobic nature of Rh(I) and Ru(II) supported organosilica/silica catalysts in organotransformation reactions
Abstract

•Synthesis and characterization of mesoporous organosilica (PMOB) hydrophobic catalysts.•Hydrophobicity was monitored by contact angle test and organic reactions.•PMOB catalysts highly active than other supported catalysts.

Highly reactive and hydrophobic triphenyl phosphine based rhodium(I) and ruthenium(II) organometallic complexes over benzene containing periodic mesoporous organosilica (PMOB) have been synthesized. This has been achieved by the immobilization of neat metal complexes like RhCl(PPh3)3 [Wilkinson catalyst], RuHCl(CO)(PPh3)3 and RuCl2(PPh3)3 over aminofunctionalized PMOB to get RhCl(PPh3)2-PrNH2PMOB, RuHCl(CO)(PPh3)2-PrNH2PMOB and RuCl2(PPh3)3-PrNH2PMOB, respectively. The physico-chemical properties of the functionalized catalysts were analyzed by elemental analysis, ICP-OES, XRD, N2 sorption analyses, FT-IR, solid state 13C and 29Si NMR spectra, XPS, SEM, TEM and contact angle measurements. The XRD and N2 sorption analyses showed excellent textural properties with ordered mesoporous channel structure of all synthesized catalysts. The organic moieties anchored in PMOB were confirmed by 13C CPMAS NMR and FT-IR spectroscopy with 29Si CPMAS NMR spectroscopy providing the information about the degree of functionalization of surface silanol groups with organic moiety. The Rh(I) and Ru(II) complexes supported on MCM-41/SBA-15/PMOE (ethane–PMO) were synthesized, and their catalytic activities in hydrogenation and sulfoxidation reactions were compared with Rh(I) and Ru(II) complexes supported on PMOB. The results show that PMOB based catalysts exhibit higher activities and selectivities than MCM-41/SBA-15/PMOE supported catalysts, neat homogeneous complexes and without catalyst. The better catalytic performance of PMOB based catalyst is attributed to the hydrophobic nature and high surface area of the PMOB support. The recycling studies of anchored catalysts show no major deactivation of the catalyst.

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Keywords
Heterogeneous catalysts; Hydrophobic; Periodic mesoporous organosilica; Hydrogenation and sulfoxidation
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Correlating the role of hydrophilic/hydrophobic nature of Rh(I) and Ru(II) supported organosilica/silica catalysts in organotransformation reactions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 513, 5 March 2016, Pages 138–146
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
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Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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