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- 저자 : Arno de Reviere (검색결과 1 건)
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Arno de Reviere,Dieter Gunst,Maarten Sabbe,An Verberckmoes 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.89 No.-
Dehydration reactions of alcohols are of prime importance in biomass conversions. Although bioalcoholsare generally obtained as mixtures, the dehydration of alcohol mixtures is barely reported. Inthis work the ability of HZSM-5 and g-Al2O3 to dehydrate a 1-butanol/ethanol mixture in a 6/1 mass-ratiowas studied, corresponding to the butanol/ethanol ratio in typical ABE mixtures, at temperatures from513 to 613 K. For HZSM-5 the difference in reactivity of the alcohols is too high to fully convert bothalcohols to their respective alkenes without catalyzing secondary reactions. For dehydration overg-Al2O3, the reactivity of ethanol and 1-butanol is more similar, which can be attributed to the lower acidstrength and larger pore size, causing lower fractional coverages and diminished competition foradsorption sites, allowing both alcohols to react more simultaneously. Above conversions of 0.6, thedifference in reactivity of both alcohols increases due to a shift in dominant reaction pathways towardsether decomposition and the intramolecular dehydration on g-Al2O3. Approaching full conversion, theselectivity towards olefins is high (>0.95) for both HZSM-5 and g-Al2O3. Since no secondary reactionsoccur when using g-Al2O3, it is deemed the best of both catalysts to dehydrate mixtures of alcoholssimultaneously to their corresponding alkenes.
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