Article ID Journal Published Year Pages File Type
40192 Applied Catalysis A: General 2014 12 Pages PDF
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.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (111 K)Download as PowerPoint slide

Keywords
Related Topics
Physical Sciences and Engineering Chemical Engineering Catalysis
Authors
, , , , , , ,