这是一片国外专利的反应，文献中只说了需要催化剂，但是没有说明催化剂是什么？求教各位大神，途中反应的催化剂应该是什么，原文这样说的：The synthesis is based on catalytic dehydration of glycerine. The glycerine, placed in a retort connected with refrigerator, is heated over inoculum catalyst to the temperature of 220-250 degrees С (Fig 1). After 20-25 minutes, the distillation of water vapor begins. The quantity of the catalyst is 0.02-0.05%. Such a minimum quantity of the catalyst is reasoned by the fact that with the production of first synthesis products, the process transits to the auto-catalytic mode. In such a way, the initial catalyst is only an inoculum for the start of the dehydration process in the auto-catalytic mode. For example, for the process of dehydration of 200 ml (252 g) of glycerine, only 50-100 mg of catalyst is needed.

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