TiO2负载Cu-Mn复合氧化物催化燃烧正己醛

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(Cu_xMn_y/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Cu_1.5Mn_1.5O₄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O_ads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。

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

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 (Cu_xMn_y/ 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 (Cu_1.5Mn_1.5O₄). 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 O_ads, 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.