Complete oxidation of ethylene by co-modified mordenites under microwave irradiation
Complete oxidation of ethylene by co-modified mordenites under microwave irradiation
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DOI：
10.1252/jcej.38.828
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发表时间：
2005-10-01
影响因子：
0.8
通讯作者：
Niiyama, H
中科院分区：
文献类型：
--
作者：
Kim, S;Watabe, Y;Niiyama, H
提出了添加高效吸收微波能量的钴氧化物（Co3O4）作为加热促进剂，以加速沸石吸附剂或催化剂的微波加热。研究了Co3O4对浸渍法和物理混合法制备的Co改性丝光沸石微波加热性能的影响。在微波辐射条件下，考察了Co改性丝光沸石对乙烯的催化氧化反应。当Co3O4和丝光沸石物理混合时，Co3O4促进丝光沸石床的微波加热。通过微波辐射将具有50wt%的Co3O4的物理混合物加热至518 K。颗粒型Co改性丝光沸石经预吸附水蒸气后，微波加热时水的脱附峰非常尖锐，大部分吸附水在微波加热初期脱附。水的尖锐解吸峰表明，粒状样品被加热到比粉末样品更高的温度。在具有75wt%的Co3O4的颗粒状Co改性丝光沸石的情况下，丝光沸石上的吸附水在微波照射期间几乎解吸。Co_3O_4具有助热剂和催化剂的双重作用，当Co_3O_4（75wt%）和丝光沸石的混合物在乙烯、水蒸气和氧气稳定进料下经微波辐照时，乙烯的转化率可达93%。
Addition of cobalt oxide (Co3O4) as a heating promoter, absorbing microwave energy with high efficiency, was suggested in order to accelerate microwave heating of zeolite adsorbent or catalyst. The effect of the addition of Co3O4 on the microwave heating of Co-modified mordenites prepared by the impregnation method and physical mixing was investigated. Catalytic oxidation of ethylene on Co-modired mordenites was also examined under microwave irradiation. Co3O4 promoted microwave heating of the mordenite bed when Co3O4 and mordenite were mixed physically. The physical mixture with Co3O4 of 50 wt% was heated up to 518 K by microwave irradiation. The desorption peak of water for pellet type Co-modified mordenite was very sharp in microwave heating after pre-adsorption of water vapor and most of adsorbed water desorbed in the initial stage of the microwave heating. The sharp desorption peak of water indicates that the pelletized sample was heated to higher temperatures than powder one. In the case of the pelletized Co-modified mordenite with Co3O4 of 75 wt %, adsorbed water on mordenite was almost desorbed during microwave irradiation. Co3O4 had both functions of the heating promoter and catalyst, and ethylene was removed with high conversion (93 %) when the pelletized mixture of Co3O4 (75 wt%) and mordenite was irradiated by microwave under steady feed of ethylene, water vapor, and oxygen.