FABRICATION OF NICKEL FOAM BASED MnO2 MONOLITHIC CATALYSTS AND ITS APPLICATION IN CATALYTIC ELIMINATION OF TOLUENE
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摘要: 开发兼具良好催化活性和优异稳定性的整体式催化剂是VOCs催化燃烧技术工业化应用的关键。传统的整体式催化剂通过在陶瓷载体上进行涂覆、浸渍等工艺制备而成,会导致活性组分分布不均、利用率低甚至失活等问题,从而降低整体式催化剂的性能。因此,利用泡沫镍与KMnO4之间的氧化还原反应,原位合成了MnO2整体式催化剂MnO2/NF-IS,考察了其催化氧化甲苯的性能,并通过XRD、SEM、TEM、H2-TPR、O2-TPD、XPS等手段对催化剂进行表征,并对MnO2/NF-IS催化氧化甲苯的反应路径进行探究。结果表明:基于泡沫镍原位合成的MnO2/NF-IS具有最佳的催化性能 (T90=248 ℃),优于粉末催化剂MnO2 (T90=271 ℃) 以及涂覆法制备的整体式催化剂MnO2/NF-WC (T90=293 ℃)。通过表征发现,MnO2/NF-IS具有特殊的多孔纳米片阵列的形貌和更高的氧空位含量,这可能是其性能优势的重要原因。研究成果为制备基于泡沫镍的MnO2整体式催化剂提供了新思路。Abstract: The crucial point of the industrial application of VOCs catalytic oxidation is to develop efficient and stable monolithic catalysts. Traditional monolithic catalysts were prepared by coating and impregnating the ceramic carrier, which led to uneven distribution of active components, low utilization rate, and even deactivation, thereby reducing the performance of monolithic catalysts. In this study, a MnO2 monolithic catalyst (MnO2/NF-IS) was prepared in situ by the redox reaction between nickel foam and KMnO4. The catalytic performance of the as-obtained catalysts for toluene oxidation was investigated. Besides, the catalysts were characterized by XRD, SEM, TEM, H2-TPR, O2-TPD, and XPS, and the degradation pathway of toluene oxidation was investigated. It has been shown that MnO2/NF-IS had a special structure of porous nanosheet arrays and abundant oxygen vacancies, delivering the best performance for toluene oxidation (T90=248 ℃), which was better than that of powder MnO2 (T90=271 ℃) as well as the integrated MnO2/NF-WC (T90=293 ℃) prepared by the coating method. Therefore, a new strategy for the synthesis of MnO2 monolithic catalysts was provided in this study.
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Key words:
- MnO2 /
- nickel foam /
- VOCs /
- catalytic oxidation /
- nanoarray /
- monolithic catalyst
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