Synthesis of 2,6-Dimethylpyrazine (cas 108-50-9) by dehydrocyclization of aqueous glycerol and 1,2-propanediamine over CuCrO catalyst: Rationalization of active sites by pyridine and formic acid adsorbed IR studies

Add time:08/19/2019    Source:sciencedirect.com

The mixed oxides of CuOCuCr2O4 (CuCrO) with different Cu/Cr mole ratios were examined for synthesis of 2,6-Dimethylpyrazine (cas 108-50-9) (2,6-DMP) by the utilization of aqueous glycerol in conjunction with 1,2-propanediamine (1,2-PDA). Influence of acid-base (both Bronsted and Lewis) sites on the product distribution is rationalized by pyridine and formic acid adsorbed Diffuse Reflectance Infrared Fourier Transform (DRIFT) spectroscopy. Pyridine adsorbed DRIFT spectra demonstrated relatively higher number Lewis acid sites on the chromium rich (Cu1Cr3) CuCrO than on copper rich (Cu2Cr1) CuCrO. The formic acid adsorbed IR spectra demonstrated strong basic sites attributed to the vibrational bands at 1584 cm−1 and 1677 cm−1 due to dissociative adsorption of formate species on Cu2Cr1 surface. The structure activity relationship is established with Cu metal surface area and the acid-base strengths of the CuCrO catalysts in the dehydrocyclization of glycerol and 1,2-PDA.

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