| Cu-Mn-Ce/分子筛催化剂吸附甲苯后的微波原位再生及床层温度分布探究 |
| 摘要点击 1607 全文点击 929 投稿时间：2014-12-23 修订日期：2015-03-25 |
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| 中文关键词 Cu-Mn-Ce/分子筛催化剂 微波原位再生 床层温度分布 穿透曲线 表征 |
| 英文关键词 Cu-Mn-Ce/ZSM catalyst microwave in-situ regeneration distribution of bed temperature breakthrough curve characterization |
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| 中文摘要 |
| 实验考察了Cu-Mn-Ce/分子筛催化剂吸附甲苯后的微波原位再生效果,分析了固定床温度场分布及催化剂多次再生后的吸附穿透曲线, 并对Cu-Mn-Ce/分子筛催化剂进行了比表面积和表面形貌的表征测试. 研究表明,微波功率117 W、空气流速0.5 m3·h-1和催化剂用量800 g下,吸附催化剂的微波再生效果良好,脱附甲苯在催化剂表面被氧化降解并使催化剂恢复吸附能力. 再生时床层温度水平截面上由内向外缓慢降低,垂直方向从下而上逐渐升高,并在床层中上部达到最高的250~350℃. 6次吸附穿透曲线和催化剂表征证实,微波原位再生时催化剂表面存在烧结与团聚现象,催化剂的比表面积和微孔体积有所减少,从而缩短了催化剂的穿透时间; 微波再生2次后,催化剂结构趋于稳定,吸附穿透时间维持在70 min左右. 研究发现,催化剂表面形貌和孔径的变化与床层温度场的分布呈正相关关系. |
| 英文摘要 |
| Microwave in-situ regeneration of Cu-Mn-Ce/ZSM catalyst adsorbed toluene, distribution of fixed bed temperature, adsorption breakthrough curves of the catalyst after several regenerations and characterizations of the catalyst by BET and SEM were investigated in this study. The research indicated that regeneration effect of the catalyst adsorbed was excellent under conditions of microwave power 117 W, air flow 0.5 m3·h-1 and catalyst dosage of 800 g. Toluene desorbed was oxidized onto the surface of the catalyst, and the adsorption capacity of the catalyst was recovered simultaneously. Under microwave irradiation, bed temperature decreased slowly from inside to outside in horizontal level, and increased gradually from down to up in vertical level so that the highest temperature reached 250-350℃ at the upper sites of the bed. Sintering and agglomeration occurred on the surface of the catalyst in the course of regeneration so that the special surface area and micropore volume of the catalyst were reduced and breakthrough time was shortened, which was verified by six adsorption breakthrough curves and related characteristics of the catalyst. However, the structure of the catalyst was steady after two regenerations, and adsorption breakthrough time was kept at 70 min. The result showed that the changes of surface morphology and pore structure were positively correlated with the distribution of bed temperature. |
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