Abstract
Catalytic dehydrochlorination of 1,1,2-trichloroethane(TCE) into 1,1-dichloroethylene(VDC) was studied by means of the pulse reaction technique on the basis of an assumption that chloride compounds of aluminum formed over the surface of alumina might be recycled back to hydrated alumina by the aid of steam to maintain the dehydrochlorination activity of its basic sites. The results suggest conditions (reaction temperature, amount of water added) which should be adequate for the realization of truly catalytic dehydrochlorination of TCE over alumina even though a few pulses of TCE in the absence of water vapor destroyed the activity as well as the selectivity of alumina for VDC formation. Furthermore, hydrated alumina showed good selectivity for VDC formation, as high as 80%, probably because of the decrease in its acidity by hydration. The effects of calcination temperature and small amounts of sodium hydroxide were also studied to improve the activity and selectivity. The basicity of hydrated alumina was discussed from the viewpoint of the reactivities and product distributions of several chloroalkanes according to linear free energy relationships.
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