CIESC Journal ›› 2016, Vol. 67 ›› Issue (9): 3678-3683.DOI: 10.11949/j.issn.0438-1157.20160132

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

ZHANG Shuai1, ZHANG Yike1, HU Rlckt1, ZHEN Bin1,2, HAN Minghan1   

  1. 1 Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;
    2 College of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, China
  • Received:2016-01-29 Revised:2016-04-08 Online:2016-09-05 Published:2016-09-05

甲醇氧化制甲醛铁钼催化剂表面结构与活性

张帅1, 张一科1, 呼日勒朝克图1, 甄彬1,2, 韩明汉1   

  1. 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
  • 通讯作者: 韩明汉

Abstract:

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 MoO3 and amorphous sponge-like Fe2(MoO4)3. In addition, the catalyst consists of sheet-shaped MoO3 and particle-shaped Fe2(MoO4)3, of which the former had barely no activity, and only the combination of the former and the latter (Fe2(MoO4)3) does show the catalytic activity.

Key words: methanol oxidation, formaldehyde, iron molydbate, precipitation, preparation, surface structure, activity

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MoO3和颗粒状的Fe2(MoO43两部分组成,游离的片状MoO3无明显催化活性,只有与Fe2(MoO43结合时才具有催化活性。

关键词: 甲醇氧化, 甲醛, 铁钼催化剂, 沉淀, 制备, 表面结构, 活性

CLC Number: