采用共沉淀法制备了甲基丙烯醛（Methacrolein，MAL）选择氧化为甲基丙烯酸（Methacrylic acid，MAA）的杂多酸盐催化剂，借助于TG/DSC、XRD、FT-IR等分析手段对不同焙烧温度下催化剂的物理化学性质进行了表征，结合固定床活性评价结果，系统考察了焙烧温度对催化剂性能的影响。结果表明，焙烧温度会影响催化剂的晶型结构、表面酸性和颗粒形貌等，进而影响催化剂的催化性能。评价结果显示，450℃焙烧制备的催化剂具有最好的催化活性，在反应温度为290℃、空速为1 050 h^-1的条件下，其转化率和选择性分别可达81.15%、80.76%。

A heteropolyacid salt catalyst for selective oxidation of methacrolein to methacrylic acid is prepared by coprecipitation method.The physicochemical properties of the catalysts prepared at different calcination temperature are characterized by means of TG/DSC,XRD,FT-IR and other analytical means.Combined with the activity evaluation results in a fixed bed,the effect of calcination temperature on the performance of the catalyst is systematically investigated.The results show that the calcination temperature can affect the crystal structure,surface acidity and particle morphology of the catalyst,and further affects the catalytic performance.The evaluation results indicate that the catalyst prepared by calcination at 450℃ has the best catalytic activity.The conversion rate of methacrolein and the selectivity of methacrylic acid can reach 81.15% and 80.76%,respectively over the best catalyst under a reaction temperature of 290℃ and a space velocity of 1 050 h^-1.

蔡先磊(1995-),男,硕士研究生,研究方向为催化工程,1458784030@qq.com