物理化学学报 >> 2016, Vol. 32 >> Issue (8): 2084-2092.doi: 10.3866/PKU.WHXB201605041

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TiO2负载Cu-Mn复合氧化物催化燃烧正己醛

李悦,张婷婷,王娟,朱圳,贾冰,余江*()   

  • 收稿日期:2016-02-18 发布日期:2016-07-29
  • 通讯作者: 余江 E-mail:jyu0017@aliyun.com
  • 基金资助:
    国家自然科学基金(21207003);北京市科技计划首都蓝天行动培育专项(Z141100001014016)

Catalytic Combustion of n-Hexanal Using Cu-Mn Composite Oxide Supported on TiO2

Yue LI,Ting-Ting ZHANG,Juan WANG,Zhen ZHU,Bing JIA,Jiang YU*()   

  • Received:2016-02-18 Published:2016-07-29
  • Contact: Jiang YU E-mail:jyu0017@aliyun.com
  • Supported by:
    the National Natural Science Foundation of China(21207003);Beijing Science and Technology Plan of Action for Blue Sky Capital Projects, China(Z141100001014016)

摘要:

通过调控Cu负载量及Cu/Mn原子比,探究其对TiO2负载Cu-Mn复合氧化物(CuxMny/TiO2)催化材料中活性组分间相互作用的影响,结果表明,铜负载量为15% (w,质量分数)和Cu/Mn原子比为1 : 1时有利于类铜锰尖晶石相Cu1.5Mn1.5O4的形成,随着Cu负载量的增加促使氧物种从晶格氧向表面吸附氧转移。复合催化材料中铜负载量的变化及Cu/Mn原子比对活性组分和催化活性间的相互作用影响显著。结果发现Cu15Mn15/TiO2在225 ℃时使正己醛转化率达到90% (T90),材料良好的性能归因于其具有较高的Cu2+与Oads含量,并可与Mn2+实现双还原氧化过程。结果表明,Cu15Mn15/TiO2复合材料中的类铜锰尖晶石活性组分可完成redox循环,以保持催化材料较高的稳定性。

关键词: 铜负载量, 铜锰原子比, CuxMny/TiO2, 活性组分, 催化氧化, 正己醛

Abstract:

In this study, we regulated copper loading and the atomic ratio of Cu/Mn and investigated the influence on interaction of the active species of Cu-Mn composite oxide catalyst supported on TiO2 (CuxMny/ TiO2). The results indicate that 15% (w, mass fraction) copper loading and a 1 : 1 atomic ratio of Cu/Mn favors formation of analogous Cu-Mn spinel (Cu1.5Mn1.5O4). With increasing loading of copper, oxygen transfers from the lattice oxygen species to defect oxygen. The changes in copper loading and the Cu/Mn atomic ratio have a large influence on the interaction between the active components and the catalytic activity. We found that 90% n-hexanal can be degraded by Cu15Mn15/TiO2 at 225 ℃ (T90). The excellent performance of Cu15Mn15/TiO2 is attributed to the higher contents of Cu2+ and Oads, which can achieve a dual redox process with Mn2+ in Cu15Mn15/TiO2. The analogous Cu-Mn spinel active ingredient can maintain high catalytic stability by redox cycles.

Key words: Copper loading capacity, Cu/Mn atomic ratio, CuxMny/TiO2, Active component, Catalytic oxidation, n-Hexanal

MSC2000: 

  • O643