Behavior of three types of catalysts in tetrahydrofuran polymerization
has been. compared. The first type includes catalysts prepared on the
basis of acid-treated bentonite clays; the second type includes catal
ysts prepared by impregnating alumina supports with heteropoly acid so
lution; the third type includes catalysts prepared by mixing dry powde
rs of silica support with heteropoly acid as active component.