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Bio-glycerol utilization: Synthesis of 2,6-dimethylpyrazine over MxOy–MCr2O4 (M = Mg, Fe, Co, Ni, Cu and Zn) catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
39516 45825 2014 10 PDF Available
Title
Bio-glycerol utilization: Synthesis of 2,6-dimethylpyrazine over MxOy–MCr2O4 (M = Mg, Fe, Co, Ni, Cu and Zn) catalysts
Abstract

•A mechanism proposed for 2,6-dimethylpyrazine and 6-hydroxymethyl-2-methylpyrazine.•A pair of acid–base sites is involved in dehydrocyclization reaction.•Copper in conjunction with copper chromite are selective for 2,6-dimethylpyrazine.

The MxOy–MCr2O4 (M–Cr–O; M = Mg, Fe, Co, Ni, Cu and Zn) mixed oxides obtained from their respective M(II)–Cr(III) hydrotalcite precursors have been examined for vapour phase dehydrocyclization of bio-glycerol and 1,2-propanediamine. The physico-chemical properties of the calcined M–Cr–O are characterized by various adsorption and spectroscopic methods. The high 2,6-dimethylpyrazine rate of Cu–Cr–O is rationalized by a combined effect of copper species in close proximity to the CuCr2O4. The kinetic studies demonstrated that glycerol undergoes dehydration to hydroxyacetone (75%) on acidic sites and dehydrogenation to produce dihydroxyacetone on basic sites (25%) at low GHSV. However, a reverse trend has been observed at higher GHSV. Fe2O3–Cr2O3 is found to be active for 2,6-dimethylpiperazine and copper in the vicinity of CuCr2O4 is highly selective for 2,6-DMP formation.

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Keywords
Bio-glycerol; 2 ;6-Dimethylpyrazine; CuO–CuCr2O4; NH3-TPD; Dehydrocyclization
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Bio-glycerol utilization: Synthesis of 2,6-dimethylpyrazine over MxOy–MCr2O4 (M = Mg, Fe, Co, Ni, Cu and Zn) catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 488, November 2014, Pages 275–284
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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Price after discount Only $4.95
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