Effective utilization of glycerol for the synthesis of 2-methylpyrazine over ZnO-ZnCr2O4 catalyst

Journal of Chemical Sciences

J Krishna Reddy²  M Kotesh Kumar²  R Sarkari²  A Venugopal²  A Hari Padmasri2¹  S Syed John²  S Naveen Kumar² 

[1] Department of Chemistry, University College forWomen, Osmania University, Koti, Hyderabad 500 095, India$$;Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad 500 007, India$$

关键词: Bio-glycerol;    2-methylpyrazine;    TEM;    FT-IR;    ESR;    ZnO-ZnCr2O4.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

Bioglycerol an inevitable by-product in the production of biodiesel was effectively utilized for the synthesis of 2-methylpyrazine (2-MP) by vapour phase dehydrocyclization with ethylenediamine over ZnOZnCr2O4(Zn-Cr-O) mixed oxides. These Zn-Cr-O samples were obtained from hydrotalcite precursors synthesized by precipitation method at different pH (∼7 and 9) and calcination in air at 450°C. X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) analysis confirmed the presence of ZnCr2O4 species. Transmission electron microscopy (TEM) images indicated spherical particles with mean diameter of 35.8 and 24 nm for the Zn-Cr-O prepared at pH ∼ 7 and ∼9, respectively. Surface Zn enrichment was observed in the near-surface region of Zn-Cr-Oprepared at pH∼9. Differences in dehydrocyclization activity of Zn-Cr-Omixed oxideswere established based on spectroscopic data that emphasized changes in structural properties of Zn-Cr-O obtained at different pH.

【 授权许可】

Unknown