甲醇氧化制甲醛铁钼催化剂研究

采用共沉淀法制备了不同Mo与Fe原子比的甲醇氧化制甲醛催化剂，在常压固定床反应器上对催化剂进行活性评价，采用BET、XRD和TEM对制备的催化剂进行表征。结果表明， Mo与Fe原子比为2.2~2.8时，催化剂具有较好的活性，(400~450) ℃焙烧的催化剂具有良好的比表面积、适宜的孔容和孔径，形成了较为稳定的MoO₃和Fe2(MoO₄)₃晶相，使催化剂具有更高的活性和选择性。对甲醇氧化制甲醛反应进行研究，结果表明,在反应温度(265~315) ℃,空速(8 500~13 000) h^-1时，甲醇转化率>98%,甲醛收率>93%, 500 h长周期考核，催化剂表现出良好的活性和稳定性。

Research on iron-molybdenum catalysts for methanol oxidation to formaldehyde

Iron-molybdenum catalysts with different Mo/Fe atom ratio for methanol oxidation for formaldehyde were prepared by co-precipitation method.Their catalytic performance were investigated in a conventional fixed bed reactor.The catalysts were characterized by BET,XRD and TEM.The results showed that the catalyst with Mo/Fe atom ratio of 2.2-2.8 and calcined at(400-450) ℃ possessed good catalytic activity and surface area,appropriate pore volume and pore size.Relatively stable MoO3 and Fe2(MoO4)3 crystal phase were formed,and the catalyst had higher activity and selectivity.Methanol conversion of >98% and formaldehyde yield of >93% were attained under the optimal reaction condition as follows:reaction temperature(265-315) ℃,space velocity(8 500-13 000) h-1.The results of 500 h life experiment showed that the catalyst exhibited high catalytic activity and stability.