Dehydration of 1,2-propanediol to propionaldehyde over zeolite catalysts

作者：Zhang Dazhi; Barri Sami A I; Chadwick David^*

来源：Applied Catalysis A: General , 2011, 400(1-2): 148-155.

DOI：10.1016/j.apcata.2011.04.028

• 1,2 Propanediol
• Dehydration
• Propionaldehyde
• Glycerol
• Zeolite
• Catalyst

Dehydration of 1,2-propanediol has been investigated over a range of zeolite catalysts with different pore structures and acidity. The reaction forms part of a two-step process for the conversion of glycerol to propionaldehyde. The effects of reaction temperature, concentration, space velocity, and SiO(2)/Al(2)O(3) ratio have been studied. The medium pore size, unidirectional channel zeolites ZSM-23 and Theta-1 showed high activity and selectivity to propionaldehyde (exceeding 90 wt% at 300-350 degrees C). Selectivity to the intermolecular dehydration product 2-ethyl-4-methyl-1,3-dioxolane was high at lower temperatures for all the zeolites, but decreased to a low value at higher temperatures and lower GHSV. The results are discussed in relation to the reaction mechanism and zeolite structures. Significant deactivation was observed for higher 1,2-propanediol partial pressures, which was partially mitigated by the addition of steam.

• 出版日期2011-6-30