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| 镧助剂对Pd/Al2O3催化剂性能的影响 |
| Effects of Lanthanum Promoter on the Performance of Pd/Al2O3 Catalyst |
| Received:September 20, 2016 |
| DOI： |
| 中文关键词: 材料化学 CO偶联 Pd/Al2O3催化剂 助剂 镧 |
| 英文关键词: materials chemistry CO coupling Pd/Al2O3 catalyst promoter lanthanum |
| 基金项目:国家重大科学仪器设备开发专项(2012YQ14000808):新型高速、高灵敏度、高通量色谱分析仪器的开发与应用。 |
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| 中文摘要: |
| 一氧化碳(CO)-亚硝酸甲酯(MN)气相氧化偶联合成草酸二甲酯(DMO)的反应是煤制乙二醇的关键转化步骤，现用的Pd/Al2O3催化剂中钯负载量高达1%。在催化剂制备过程中添加不同助剂，用催化燃烧热阻型检测系统考察其对合成反应的催化性能影响。表征分析表明，镧助剂可改善钯在载体上的分散；当La2O3/Al2O3=14 mg/g时，La2O3在载体表面以单层分散，制成的催化剂中钯分散性最好。性能评价结果显示，载钯量0.2%的催化剂具有较好的稳定性，在优化反应条件下，其性能甚至优于工业催化剂。 |
| 英文摘要: |
| The synthetic reaction of dimethyl oxalate (DMO) via oxidative coupling of carbon monoxide (CO) with methyl nitrite (MN) in gaseous phase is a key step in the conversion of coal to ethylene glycol. The reaction is catalyzed by commercial Pd/Al2O3 catalyst containing palladium as high as 1%. The doped Pd/Al2O3 catalysts were prepared by adding additives in the preparation process, and their catalytic performance was evaluated in the catalytic combustion thermal resistance detection system. The results showed that the lanthanum addition could improve the dispersion of palladium on the carrier. When the ratio of La2O3 to Al2O3 was set at 14 mg/g, La2O3 would disperse on the surface of the carrier in the form of monolayer to reach a best dispersion. The catalyst with 0.2% palladium content had good stability, and its catalytic activity was found to be even better than that of the industrial catalyst under the optimized reaction conditions. |
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