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Influence of acid-base sites on ZnO–ZnCr2O4 catalyst during dehydrocyclization of aqueous glycerol and ethylenediamine for the synthesis of 2-methylpyrazine: Kinetic and mechanism studies

Paper ID Volume ID Publish Year Pages File Format Full-Text
40192 45845 2014 12 PDF Available
Title
Influence of acid-base sites on ZnO–ZnCr2O4 catalyst during dehydrocyclization of aqueous glycerol and ethylenediamine for the synthesis of 2-methylpyrazine: Kinetic and mechanism studies
Abstract

•A surface reaction mechanism proposed for 2-methylpyrazine on Zn–Cr–O catalyst.•Adsorption of Lewis bases defined the product distribution in dehydrocyclization.•Dehydrocyclization activity is dependent on acid-base strength of Zn–Cr–O catalyst.

The physicochemical characteristics of ZnO–ZnCr2O4 (Zn–Cr–O) mixed oxides were determined by adsorption and spectroscopic methods. The catalytic activities of Zn–Cr–O was investigated for dehydrocyclization of ethylenediamine and aqueous glycerol to synthesize 2-methylpyrazine (2MP). Reductive pre-treatment was required for better 2MP yields and rate of 2MP was dependent upon strong basicity of Zn–Cr–O. Product distribution revealed that cyclocondensation of glycerol and ethylenediamine followed by homo-coupling of 2-pyrazinylmethanol occurred on moderate acid and strong base sites. On the contrary weak to moderate acidic and base sites were inefficient for homo-coupling of 2-pyrazinylmethanol. Role of acid-base properties was examined by pyridine and 2,6-dimethylpyridine poisoning studies.

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Keywords
2-Methylpyrazine; ZnO–ZnCr2O4; O2 pulse chemisorption; NH3–CO2 TPD; Pyridne-2,6-dimethylpyridine FTIR
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Influence of acid-base sites on ZnO–ZnCr2O4 catalyst during dehydrocyclization of aqueous glycerol and ethylenediamine for the synthesis of 2-methylpyrazine: Kinetic and mechanism studies
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 469, 17 January 2014, Pages 398–409
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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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