甲醇氧化制甲醛铁钼催化剂表面结构与活性

doi:10.11949/j.issn.0438-1157.20160132

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

• 催化、动力学与反应器 • 上一篇下一篇

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 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

收稿日期:2016-01-29 修回日期:2016-04-08 出版日期:2016-09-05 发布日期:2016-09-05
通讯作者: 韩明汉

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

ZHANG Shuai¹, ZHANG Yike¹, HU Rlckt¹, ZHEN Bin^1,2, HAN Minghan¹

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

摘要/Abstract

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（MoO₄）₃两部分组成，游离的片状MoO₃无明显催化活性，只有与Fe₂（MoO₄）₃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

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

中图分类号:

O643

张帅, 张一科, 呼日勒朝克图, 甄彬, 韩明汉. 甲醇氧化制甲醛铁钼催化剂表面结构与活性[J]. 化工学报, 2016, 67(9): 3678-3683.

ZHANG Shuai, ZHANG Yike, HU Rlckt, ZHEN Bin, HAN Minghan. Surface structure and activity of iron molybdate catalyst for methanol oxidation to formaldehyde[J]. CIESC Journal, 2016, 67(9): 3678-3683.

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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

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