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Catalytic properties of a Rh–diamine complex anchored on activated carbon: Effect of different surface oxygen groups

Paper ID Volume ID Publish Year Pages File Format Full-Text
43338 45965 2007 8 PDF Available
Title
Catalytic properties of a Rh–diamine complex anchored on activated carbon: Effect of different surface oxygen groups
Abstract

Hybrid catalysts, consisting of the rhodium complex [Rh(COD)NH2CH2CH2NH(CH2)3Si(OCH3)3]+BF4−, (abbreviated as Rh(NN)Si), anchored on activated carbon have been prepared. The anchorage takes place by reaction of the Si(OCH3)3 ligand functionality with the surface oxygen complexes of the support. This work analyzes the effect of the extent and type of surface oxidation of the support on the catalytic properties of the obtained catalysts. The original activated carbon (ROX0.8, NORIT) was oxidized using HNO3 and (NH4)2S2O8 solutions and synthetic air. The supports were characterized by gas adsorption (N2 at 77 K and CO2 at 273 K), temperature programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS). The hybrid catalysts were characterized by XPS and their catalytic activity tested in the hydrogenation of cyclohexene. The results show that the catalysts prepared with extensively oxidized supports are less active. Surface oxidation has been considered to affect the location of the metal complex on the support surface. The metal complex is not deactivated in consecutive reaction cycles, but in most cases some leaching takes place. The catalyst prepared with the air oxidized support is the most active and stable one.

Graphical abstractHybrid catalysts, consisting of the rhodium complex [Rh(COD)NH2CH2CH2NH(CH2)3Si(OCH3)3]+BF4−, anchored on activated carbon have been prepared. The anchorage takes place by reaction of the Si(OCH3)3 ligand functionality with the surface oxygen complexes of the support. This work analyzes the effect of the extent and type of surface oxidation of the support on the catalytic properties of the obtained catalysts.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Metal complex heterogenization; Activated carbon support; Surface oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 331, 2007, Pages 26–33
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us