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- W2024293145 abstract "ZnO-based catalysts on Al2O3 as support are prepared and modified with different metal elements through impregnation, and first applied in synthesis of pyrazinyl compounds from glycerol and 1,2-propanediamine (PDA) in the present work. The results indicate that the produced pyrazinyl compounds mainly include 6-hydroxymethyl-2-methylpyrazine (6-HMP), 5-hydroxymethyl-2-methylpyrazine (5-HMP), 2,6-dimethylpyrazine (2,6-DMP) and 2,5-dimethylpyrazine (2,5-DMP). Characterization results show that ZnO species in catalysts provide acid–base pairs (Zn2+–O2−), catalysts modified by Ce, Ca, Mn and Mo exhibit spillover phenomenon of hydrogen. According to the effect of Zn amount and modification on the physicochemical and catalytic property of ZnO-based catalysts, the cyclization pathway of glycerol with PDA is proposed. The formation of 2,6- and 2,5-DMP is thought to directly take place over acid sites through glycerol dehydration and further cyclization with the activated PDA, also through hydrodehydration of 6- and 5-HMP, respectively. 6- and 5-HMP are mainly produced by the interaction of activated PDA molecules on acidic sites with dihydroxypropanal or dihydroxyacetone from glycerol dehydrogenation on basic sites." @default.
- W2024293145 created "2016-06-24" @default.
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- W2024293145 date "2013-05-01" @default.
- W2024293145 modified "2023-10-16" @default.
- W2024293145 title "Reaction pathway in vapor-phase synthesis of pyrazinyl compounds from glycerol and 1,2-propanediamine over ZnO-based catalysts" @default.
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- W2024293145 doi "https://doi.org/10.1016/j.molcata.2013.01.032" @default.
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