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Selective hydrogenation of chloronitrobenzenes with an MCM-41 supported platinum allyl complex derived catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
41436 45889 2011 9 PDF Available
Title
Selective hydrogenation of chloronitrobenzenes with an MCM-41 supported platinum allyl complex derived catalyst
Abstract

A platinum precatalyst (1) has been prepared by reacting [(η3-C3H5)4Pt4Cl4] with surface functionalized MCM-41 with pendant –(CH2)3NH(CH2)2NH2 groups. For the hydrogenation of o-, m- and p-chloronitrobenzenes to the corresponding chloroanilines, 1 is found to be a highly active catalyst with good selectivities for the m- and p-isomers. Its performance is superior to that of its palladium analogue and far superior to that of commercial (5%) Pt/C or (5%) Pt/Al2O3. Comparison of solid state and solution NMR data and other evidences indicate that on treatment with the functionalized MCM-41 support; [(η3-C3H5)4Pt4Cl4] loses the allyl ligand. XPS data show that in the fresh catalyst Pt is present in the 2+ oxidation state. Based on these and analytical data, co-ordination by surface diamine and hydroxo groups to Pt2+ in 1 is suggested. In the used catalyst both Pt2+ and Pt0 are present but the amount of metallic platinum is ∼16% of the total.

Graphical abstractPlatinum derived functionalized MCM-41 supported catalyst (1) exhibits excellent catalytic activities towards the selective hydrogenations of o-, m-, p-chloronitrobenzenes to corresponding chloroanilines whereas no such high selectivity exists either with the analogous Pd-derived catalyst or commercial catalysts (5%) Pt/C and (5%) Pt/Al2O3.Figure optionsDownload full-size imageDownload high-quality image (203 K)Download as PowerPoint slideHighlights► Organometallic derived Pt(II) precatalyst supported on functionalized MCM-41. ► Selective hydrogenation of chloronitrobenzenes with low dehydrohalogenation. ► High selectivity towards the hydrogenation of meta- and para-chloronitrobenzenes. ► Unlike its Pd-analogue, in the used catalyst Pt is mainly in +2 oxidation state. ► Much better performance than commercially available 5% Pt/C and Pt/alumina.

Keywords
Heterogeneous catalyst; Selective hydrogenation; Dehydrohalogenation; Chloronitrobenzenes; MCM-41
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Selective hydrogenation of chloronitrobenzenes with an MCM-41 supported platinum allyl complex derived catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 399, Issues 1–2, 31 May 2011, Pages 117–125
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