以SiO2为载体,采用等体积浸渍法合成V2O5/SiO2催化剂,用XRD对催化剂进行了表征,并考察了不同条件对催化氧化乙二醛制备乙醛酸的影响。结果表明,当负载量为1%、焙烧温度为550℃、反应温度为55℃、催化剂用量为0.20 g时,催化效果最好,乙二醛的转化率可达12.02%,乙醛酸的得率为9.01%。 V2O5 / SiO2 catalysts were synthesized by impregnation of SiO2 with the same volume. The catalysts were characterized by XRD and the effects of different conditions on the glyoxylation of glyoxal to glyoxylic acid were investigated. The results show that when the loading is 1%, the calcination temperature is 550 ℃, the reaction temperature is 55 ℃, the catalyst dosage is 0.20 g, the catalytic effect is the best, the conversion rate of glyoxal up to 12.02% The rate was 9.01%.