催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (12): 1034-1036.

• 研究快讯 • 上一篇    下一篇

Ag-Hollandite纳米线的合成及其催化氧化乙醇的性能

陈俊利,李娟,刘琪英,黄秀敏,申文杰   

  1. 中国科学院大连化学物理研究所催化基础国家重点实验室, 辽宁大连 116023
  • 收稿日期:2007-12-25 出版日期:2007-12-25 发布日期:2007-12-25

Facile Synthesis of Ag-Hollandite Nanofibers and Their Catalytic Activity for Ethanol Selective Oxidation

CHEN Junli, LI Juan, LIU Qiying, HUANG Xiumin, SHEN Wenjie*   

  1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian 116023, Liaoning, China
  • Received:2007-12-25 Online:2007-12-25 Published:2007-12-25

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829

被引次数

13

摘要： 通过在硝酸溶液中373 K回流AgMnO4和Mn(NO3)2的混合物制备了Ag-hollandite纳米线材料,并将其用于乙醇选择性氧化反应. X射线衍射谱表明所得材料的主要晶相为Ag-hollandite, 但有少量的软锰矿形成. 氮气吸附-脱附实验证实材料存在微孔结构. 场发射扫描电镜和透射电镜观察表明纳米线长度为0.5～4.0 μm, 直径为10～20 nm. Ag-hollandite纳米线是一种很有前途的乙醇选择性氧化制乙醛催化剂, 503 K时在120 h的反应时间内,乙醇转化率为82%, 乙醛选择性为95%.

关键词: 银, 锰钡矿, 纳米线, 乙醇氧化

Abstract: Ag-hollandite nanofibers were synthesized by refluxing a mixture of AgMnO4 and Mn(NO3)2 in nitrate acid solution at 373 K and used for ethanol selective oxidation. TheX-raydiffraction pattern showed that the main crystalline phase was Ag-hollandite, but a small amount of pyrolusite was also formed. The N2 adsorption-desorption isotherms confirmed the presence of a microporous structure. Field emission scanning electron microscopy and transmission electron microscopy showed that the lengths of the nanofibers were0.5-4.0μm, and the diameters were 10-20 nm. The Ag-hollandite nanofibers gave a promising catalytic performance for ethanol selective oxidation to acetaldehyde, with an ethanol conversion of 82% and acetaldehyde selectivity of 95% at 503 K for 120 h time-on-stream.

Key words: silver, hollandite, nanofiber, ethanol oxidation