甲醇氧化制甲醛铁钼催化剂研究  

Research on iron-molybdenum catalysts for methanol oxidation to formaldehyde

作　　者：李速延[1] 封建利 高超[1] 刘恩利[1] 左满宏[1] 徐敏燕[1] 

机构地区：[1]西北化工研究院,陕西西安710054 [2]陕西陕化化工集团有限公司,陕西华县714100

出　　处：《工业催化》2012年第8期35-39,共5页Industrial Catalysis

摘　　要：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。Iron-molybdenum catalysts with different Mo/Fe atom ratio for methanol oxidation for formalde- hyde were prepared by co-precipitation method. Their catalytic performance were investigated in a conven- tional 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 Fez （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.

关 键 词：催化化学 甲醇氧化 甲醛 铁钼催化剂 

分 类 号：TQ426.94[化学工程] O643.36[理学—物理化学]