Abstract
The dehydration of alcohols on modified aluminas wag studied by using the same material simultaneously as catalyst and as stationary phase in a gas-solid Chromatograph. In such a system, periodic stopping of the gas flow through the column leads to the reaction products appearing as sharp chromatographic peaks for each stopped-flow interval, so that the rate of reaction is effectively followed throughout the whole course of the reaction. The reliability of comparative measurements is enhanced by carrying out a standard dehydration (e.g., of n-heptanol) together with the dehydration of another alcohol. The results support a trans-elimination mechanism and suggest that there are two distinct types of catalytic site. Autocatalysis (by water) and polymerization of olefin products were also investigated and allowance was made for these effects in the kinetic analysis.
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