It was observed that the catalytic activity and the usable life of the treated niobic acid for synthesis of diethylene glycol dibenzoate was apparently higher than that of the untreated niobic acid.
用于催化酯化合成二甘醇二苯甲酸酯增塑剂 ，处理后固体铌酸的催化活性和重复使用寿命有明显提高。
It was observed that the catalytic activity and the usable life of the treated niobic acid for synthesis of diethylene glycol dibenzoate was apparently higher than that of the untreated niobic acid.
用于催化酯化合成二甘醇二苯甲酸酯增塑剂 ，处理后固体铌酸的催化活性和重复使用寿命有明显提高。
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