Catalytic dehydration of 1,2-propanediol into propanal

• Published in: Applied catalysis. A, General Vol. 366; no. 2; pp. 304 - 308
• Main Authors: Mori, Keitaro, Yamada, Yasuhiro, Sato, Satoshi
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 25.09.2009; Elsevier
• Subjects: 1,2-Propanediol; Catalysis; Chemistry; Dehydration; Exact sciences and technology; General and physical chemistry; Heteropoly acid; Propanal; Silicotungstic acid; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Silicotungstic acid; 1,2-Propanediol; Dehydration; Heteropoly acid; Propanal; Binary compound; Catalytic reaction; Support; Oxides; Selectivity; Aldehyde; Conversion; Silica; Acetal; Heterogeneous catalysis; Heteropolyacid; Acids; Vapor phase; Propanediol; Catalyst
• ISSN: 0926-860X; 1873-3875
• DOI: 10.1016/j.apcata.2009.07.018

Vapor-phase catalytic dehydration of 1,2-propanediol was investigated over several catalysts, such as acidic oxides and supported heteropoly acids. These acids catalyze the dehydration of 1,2-propanediol to produce propanal. In particular, silica-supported silicotungstic acid showed the highest catalytic activity in the formation of propanal. Under optimum reaction conditions, 100% conversion was attained with propanal selectivity higher than 93 mol% at 200 °C. Vapor-phase catalytic dehydration of 1,2-propanediol was investigated over several catalysts, such as acidic oxides and supported heteropoly acids. These acids catalyze the dehydration of 1,2-propanediol to produce propanal. In particular, silica-supported silicotungstic acid showed the highest catalytic activity in the formation of propanal. At low conversions, however, propanal reacted with another 1,2-propanediol to produce a cyclic acetal (2-ethyl-4-methyl-1,3-dioxolane). Such acetal formation reduced the selectivity to propanal. Under optimum reaction conditions, 100% conversion was attained with propanal selectivity higher than 93 mol% at 200 °C.