:Oxidation of Isopropyl Alcohol over Manganese Nodules

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The catalytic decomposition of isopropyl alcohol over manganese nodules has been studied to obtain the information about the catalytic characteristics of manganese nodules. Reaction was carried out in a pulse microreactor with dry helium as a carrier gas. Besides manganese nodules, ferric and manganese hydroxide which are the principal constituents were also used as the catalyst to examine the catalytic active sites of manganese nodules. As the result, the following conclusions were obtained.1) Over manganese nodules, isopropyl alcohol was converted mainly to acetone, carbon dioxide and water, hardly to propylene.2) The catalytic active sites of manganese nodules were different from those of ferric and manganese hydroxide and their mixture.3) Oxygen on manganese nodules which played an important part was classified into two different types: i) oxygen which is so reactive as to oxidize completely the alcohol to carbon dioxide and water and is hardly regenerated even if manganese nodules were recalcined in helium adding oxygen gas largely, ii) oxygen which dehydrogenates isopropyl alcohol to acetone and is regenerated easily.
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