Montmorillonite K30 Supported Tungstophosphoric Acid as an Efficient Catalyst for Condensation Reaction of Methyl N-phenylcarbamate for Generating Diurethane

Methylene diphenyl-4,4′-dicarbamate (MDC) was prepared via condensation reaction of methyl N -phenyl carbamate (MPC) and formaldehyde (HCHO) over montmorillonite K30 supported tungstophosphoric acid (TPA/K30) as an effective catalyst. A 26.2 wt.% TPA/K30 exhibited the highest product yield (75.5%) u...

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Bibliographic Details
Published in:Catalysis letters 2022-07, Vol.152 (7), p.2206-2214
Main Authors: Tran, Anh Vy, Lee, Hye Jin, Baik, Joon Hyun, Baek, Jayeon, Kim, Yong Jin
Format: Article
Language:English
Subjects:
Acids
Analysis
Carbamates
Catalysis
Catalysts
Chemistry
Chemistry and Materials Science
Clay
Condensates
Formaldehyde
Industrial Chemistry/Chemical Engineering
Lewis acid
Montmorillonite
NMR
Nuclear magnetic resonance
Organometallic Chemistry
Physical Chemistry
Pyridine
Spectrum analysis
Tungsten compounds
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Summary:Methylene diphenyl-4,4′-dicarbamate (MDC) was prepared via condensation reaction of methyl N -phenyl carbamate (MPC) and formaldehyde (HCHO) over montmorillonite K30 supported tungstophosphoric acid (TPA/K30) as an effective catalyst. A 26.2 wt.% TPA/K30 exhibited the highest product yield (75.5%) under a mild reaction temperature of 90 °C for 4 h at the molar ratio of MPC/HCHO = 4. Pyridine FTIR study indicates that Brønsted and Lewis acid sites in the TPA/K30 were found to be beneficial for achieving an excellent yield of MDC. Furthermore, the TPA/K30 could be reused at least four runs without significant loss in the original activit y . Graphic Abstract
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-021-03793-4