Use of NiO/SiO₂ catalysts for toluene total oxidation: Catalytic reaction at lower temperatures and repeated regeneration

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• 作者：Sang Wook Han^a ; ^&dagger ; ; Myung-Geun Jeong^a ; ^&dagger ; ; Il Hee Kim^a ; Hyun Ook Seo^a ; ^{seoho83@skku.edu} ; Young Dok Kim^a ; ^b ; ^{ydkim91@skku.edu}
• 关键词：Heterogeneous catalysis ; Chemisorption ; Thermal desorption ; Mesoporous material ; Toluene oxidation
• 刊名：Chinese Journal of Catalysis
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：37
• 期：11
• 页码：1931-1940
• 全文大小：1039 K
• 卷排序：37

文摘

We deposited NiO via atomic layer deposition on mesoporous SiO2 particles with diameters of several hundred micrometers and a mean mesopore size of ∼14 nm. NiO was deposited within the shell region of mesoporous SiO2 particles with a shell thickness of ∼11 mm. We annealed the as-prepared NiO/SiO2 at 450 and 600 °C, respectively. These two samples were used as catalysts for the uptake of toluene molecules and their oxidative conversion to CO2. The sample annealed at 450 °C was generally more reactive in toluene uptake and its subsequent conversion to CO2. When the NiO/SiO2 annealed at 450 °C was exposed to toluene vapor at 160 °C and then heated to 450 °C, CO2 was emitted with almost no toluene desorption. We suggest that our catalysts can be used as building blocks for odor removal devices that operate below 200 °C. These catalysts can be regularly regenerated at ∼450 °C.