Abstract
1. The existence of two mechanisms was established for the formation of tar and carbon in the decomposition of acetic acid and acetone on silica gel. Polycondensation of the obtained or starting acetone occurs at 400–650°. Polycondensation of the obtained ketene occurs mainly above 650°. 2. The formation of carbonaceous material was detected in the decomposition of formic acid on silica gel in the temperature range 500–625°. Here the carbon-forming material is formaldehyde, obtained from the formic acid by a reaction that is analogous to the ketonization of carboxylic acids.
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