甲醇氧化制甲醛铁钼催化剂表面结构与活性  

Surface structure and activity of iron molybdate catalyst for methanol oxidation to formaldehyde

作　　者：张帅[1] 张一科[1] 呼日勒朝克图 甄彬[1,2] 韩明汉[1] 

机构地区：[1]清华大学化学工程系,北京100084 [2]天津理工大学化学化工学院,天津300384

出　　处：《化工学报》2016年第9期3678-3683,共6页CIESC Journal

摘　　要：利用共沉淀法在不同搅拌速度下制备了相同Mo/Fe原子比的甲醇氧化制甲醛催化剂,采用SEM、XRD和拉曼光谱等对催化剂进行表征,在固定床微反上评价催化剂活性和选择性。结果表明,搅拌速度增大,催化剂比表面积增大,催化活性增强,甲醛收率由600 r·min^(-1)时的73.8%增加到10000 r·min-1时的95.7%(280℃)。此外,催化剂由片状的MoO_3和颗粒状的Fe_2(MoO_4)_3两部分组成,游离的片状MoO3无明显催化活性,只有与Fe2(Mo O4)3结合时才具有催化活性。Iron-molybdenum catalysts with the same atomic ratio of Mo/Fe for methanol oxidation to formaldehyde were prepared by co-precipitation method under varied rates of stirring. The catalysts were characterized by SEM, XRD and Raman spectrum and the catalytic activity and selectivity evaluated in a fixed-bed reactor.It showed that with an increase of stirring speed, the specific surface area of the catalysts increases and the catalytic activity enhances. The yield of formaldehyde increases from 73.8% at 600 r·min^（-1） to 95.7%（T=280℃） at 10000 r·min-1. The catalyst consists of plate-like MoO_3 and amorphous sponge-like Fe2（MoO_4）_3. In addition, the catalyst consists of sheet-shaped MoO_3 and particle-shaped Fe_2（MoO_4）_3, of which the former had barely no activity, and only the combination of the former and the latter（Fe_2（MoO_4）_3） does show the catalytic activity.

关 键 词：甲醇氧化 甲醛 铁钼催化剂 沉淀 制备 表面结构 活性 

分 类 号：O643[理学—物理化学]