Abstract
Several commercially available supports were examined for cyclization of monoethanolamine to aziridine, and SiO2 was found to yield the best results. The obtained results indicated that selectivity of aziridine was mainly influenced by support. The catalysts were characterized by NH3-TPD and XRD. It was found that SiO2 with lower acidity could inhibit the intermolecular condensations, and thus favored the formation of aziridine. The Cs4P2O7 phase was confirmed as the active site in the supported cesium phosphate catalyst. The reaction parameters were also optimized and a yield of 52% aziridine was obtained over 200 h. Thus, a continuous process for the cyclization of monoethanolamine to aziridine has been established.
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