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Water-improved heterogeneous transfer hydrogenation using methanol as hydrogen donor over Pd-based catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
42484 45927 2010 6 PDF Available
Title
Water-improved heterogeneous transfer hydrogenation using methanol as hydrogen donor over Pd-based catalyst
Abstract

The heterogeneous catalytic transfer hydrogenation (CTH) of styrene and nitrobenzene over Pd-based catalyst using methanol as hydrogen donor was investigated in a fixed-bed reactor. With the increase of the molar ratio of water to methanol from 0 to 1, the conversions of styrene and nitrobenzene are increased from 26.3% and 7.1% to 100% and 31.9%, respectively, and the selectivity of aniline is increased from 22.0 to 94.5 mol%. The presence of water improves the hydrogen transfer from methanol to styrene or nitrobenzene through the quick reaction of water with formaldehyde, formed from the dehydrogenation of methanol, into formic acid, which is an excellent hydrogen donor for the CTH of unsaturated organics. In the presence of water, methanol is a better hydrogen donor than isopropanol, n-propanol and ethanol, because water cannot easily react with acetone, propionaldehyde, and acetaldehyde formed from isopropanol, n-propanol, and ethanol, respectively. Additionally, the hydrogen atom utilization of the methanol donor in the presence of water is higher than the other donors, hydrogen atom in a part of water can also be utilized for the reduction of unsaturated organics.

Graphical abstractWater can highly improve the hydrogen transfer from methanol to styrene or nitrobenzene through the quick conversion of formaldehyde into formic acid with water, and the occurrence of the CTH from formic acid as hydrogen donor leading to the formation of CO2. Hence, the heterogeneous CTH of unsaturated organics using methanol as hydrogen donor is realized.Figure optionsDownload full-size imageDownload high-quality image (58 K)Download as PowerPoint slide

Keywords
Water; Transfer hydrogenation; Methanol; Heterogeneous catalysis
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Water-improved heterogeneous transfer hydrogenation using methanol as hydrogen donor over Pd-based catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 375, Issue 2, 1 March 2010, Pages 289–294
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