Selective oxidation of cyclohexane using Ce1-xMnxO2 nanocatalysts.
Selective oxidation of cyclohexane using Ce1-xMnxO2 nanocatalysts.
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DOI：
10.1166/jnn.2014.8637
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发表时间：
2014-04
影响因子：
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通讯作者：
A. Selvamani;M. Selvaraj;M. Gurulakshmi;R. Ramya;K. Shanthi
中科院分区：
文献类型：
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作者：
A. Selvamani;M. Selvaraj;M. Gurulakshmi;R. Ramya;K. Shanthi
Ce 1-xMnxO 2纳米催化剂（x = 0.25、0.50和0.75 wt.%）采用溶胶-凝胶法合成了。采用XRD、N2吸附研究、DRSUV-Vis、TPR、SEM和TEM等技术对催化剂进行了表征。通过XRD分析证实Mn离子并入到二氧化铈晶格中。DRUV-Vis光谱证实了Ce 1-xMnxO 2晶格中存在Ce 3+离子。H_2-TPR研究揭示了催化剂的储氧能力。从FESEM和HRTEM图像证实了纳米催化剂的三维花状形态。以空气为氧化剂，考察了该催化剂对环己烷气相氧化反应的催化活性。通过改变关键反应参数，考察了催化剂的稳定性、活性和选择性。研究表明，适量的Mn含量是环己烷低温选择氧化的关键，Ce0.25Mn0.75O2催化剂在一定的反应条件下具有较高的转化率和选择性。催化剂的活性与表征结果相关联。
The Ce1-xMnxO2 nanocatalysts (x = 0.25, 0.50 and 0.75 wt.%) were synthesized by sol-gel method. The catalysts were characterized using various techniques such as XRD, N2 sorption study, DRSUV-Vis, TPR, SEM and TEM. The incorporation of Mn ions into the ceria lattice was confirmed by XRD analysis. DRUV-Vis spectra confirm the presence of Ce3+ ions in the lattice of Ce1-xMnxO2. H2-TPR study revealed the oxygen storage capacity of the catalyst. The 3D flowerlike morphology of the nanocatalysts was confirmed from FESEM and HRTEM images. The catalytic activity was tested for the vapor phase oxidation of cyclohexane using air as an oxidant. The key reaction parameters were varied to study the stability, activity and selectivity of the catalysts. The study concluded that suitable amount of manganese content is essential for the selective oxidation of cyclohexane at low temperature and Ce0.25Mn0.75O2 is the most suitable catalyst for high conversion and selectivity under the given reaction conditions. The activity of the catalyst is correlated with the characterization results.