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Effect of Al2O3/MgO molar ratio on catalytic performance of Pt/MgO–Al2O3 catalyst in acetonitrile hydrogenation followed by Fourier transform infrared spectroscopy

Paper ID Volume ID Publish Year Pages File Format Full-Text
39854 45837 2014 8 PDF Available
Title
Effect of Al2O3/MgO molar ratio on catalytic performance of Pt/MgO–Al2O3 catalyst in acetonitrile hydrogenation followed by Fourier transform infrared spectroscopy
Abstract

•Pt / MgO-Al2O3 catalysts were investigated for acetonitrile hydrogenation.•The selectivity towards primary amine is correlated with the Al/Mg ratio.•Al/Mg ratio had a important impact on acid-base properties of the support.•In-situ FTIR spectroscopy evidenced the formation of an intermediate species.•Ketenimine is proposed as this species and is included in the reaction mechanism.

Catalytic performances of Pt based catalysts supported on (Al2O3)x (MgO)1−x oxides prepared by sol–gel techniques, with x varying from 0.25 to 0.75 were investigated for acetonitrile hydrogenation to check the influence of acid-base properties of the support. The results evidenced a correlation between these properties and the yield towards the primary amines, the most desired ones. Thus, the more basic the support is, the higher the production of primary amines will be. However, an optimal values for both activity and selectivity is obtained for 1% Pt/(Al2O3)0.25(MgO)0.75. Then, hydrogenation of acetonitrile was studied by in situ FTIR spectroscopy and the formation of an intermediate species that would lead to secondary and tertiary amines formation was observed on the catalysts. In accordance to previous reaction pathways, ketenimine (CH2CNH) was proposed as this species.

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Keywords
Acetonitrile hydrogenation; Catalysis by noble metals; Al2O3–MgO mixed oxides support; FTIR studies; Sol–gel preparation; Platinum
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Effect of Al2O3/MgO molar ratio on catalytic performance of Pt/MgO–Al2O3 catalyst in acetonitrile hydrogenation followed by Fourier transform infrared spectroscopy
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 475, 5 April 2014, Pages 363–370
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
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