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Dispersion and hydrogenation activity of surfactant-stabilized Rh(0) nanoparticles prepared on different mesoporous supports

Paper ID Volume ID Publish Year Pages File Format Full-Text
41476 45890 2011 8 PDF Available
Title
Dispersion and hydrogenation activity of surfactant-stabilized Rh(0) nanoparticles prepared on different mesoporous supports
Abstract

Supported Rh(0) colloidal particles were prepared by the reduction of Rh(III) ions by sodium borohydride in the presence of N-N-dimethyl-N-cetyl-N-(2-hydroxyethyl) ammonium chloride (HEA16Cl), usually used as a stabilizing agent in solution. Tested supports were Na–Al–SBA-15, SBA-15 and CMK-3. In each case, the influence of HEA16Cl was studied by comparison with blank samples. Surfactant and rhodium uptake were evaluated by means of elemental analysis and eventually thermogravimetry. Obtained materials were also characterized by XRD, N2 sorption and TEM. Given the results, it appears that HEA16Cl promotes rhodium uptake in all cases. Most significant effects on the size and dispersion of particles were observed for the system combining HEA16Cl and Na–Al–SBA-15. All the solids prepared in this study were tested in the room temperature hydrogenation of styrene as well as that of a more demanding substrate, diphenylmethane, at 0.1 MPa of H2. All of them were generally more active than their commercial analogue (5 wt.% Rh0/C). Best catalysts, i.e., those prepared from Na–Al–SBA-15 in the presence of HEA16Cl as well as CMK-3 without HEA16Cl, allowed almost 100% yield of dicyclohexylmethane within 6 h (molar substrate/Rh = 100).

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (260 K)Download as PowerPoint slideResearch highlights▶ Rh loading is improved after contacting supports with a stabilizing agent, HEA16Cl. ▶ HEA16Cl is needed to get well-dispersed Rh(0) particles over Al–SBA-15 and SBA-15. ▶ There is no need to use HEA16Cl in the case of CMK-3 support. ▶ Best catalysts are Rh0–Na–AlSBA (w HEA16Cl) and Rh0–CMK–NH3 (B) (w/o HEA16Cl). ▶ They are more active than commercial catalysts in the hydrogenation of aromatics.

Keywords
Rh(0) nanoparticles; SBA-15; CMK-3; Hydrogenation; Aromatic substrates
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Dispersion and hydrogenation activity of surfactant-stabilized Rh(0) nanoparticles prepared on different mesoporous supports
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 394, Issues 1–2, 28 February 2011, Pages 158–165
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