Abstract
Abstract The esterification of acrylic acid with methanol and the hydrolysis of the ester were examined over niobic acid preheated at different temperatures. Niobic acid pretreated at 200 – 400°C showed a high activity and selectivity (⋍100%) for both reactions. In the reaction of acrylic acid with excess methanol, niobic acid could maintain the conversion of more than 90% for 6 h or more.
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