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The manufacture of butadiene from ethanol by the American two-step process developed by Car-bide and Carbon Chemicals Corporation3•4 and operated by that organization and by Koppers Company, Inc., comprised (1) dehydrogenation of ethanol to acetaldehyde followed by (2) catalysis of acetaldehyde-ethanol to produce butadiene. This paper discusses the mechanism of the second step, ih which a mixture of approximately 69 wt. % of ethanol, 24 wt. % of acetaldehyde and 7 wt. % of water was passed over a 2% Ta20s-98% SiOj cata-

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