Deactivation behavior of SiO2 supported copper catalyst in hydrogenation of diethyl oxalate
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摘要: 草酸酯加氢合成乙二醇过程中负载量为20%的Cu催化剂可以获得较高的乙二醇（EG）收率，但是该催化剂寿命过短的问题限制了其工业应用。本实验主要研究造成该催化剂失活的原因。使用蒸氨法将铜负载在SiO2上，制成用于草酸二乙酯（DEO）加氢的催化剂。运用X射线衍射（XRD）、程序升温还原（TPR）和高分辨率透射电镜（HRTWEM）来表征催化剂。发现铜颗粒以很小的粒径高度分散在新鲜催化剂的表面，而这些颗粒的聚集正是造成催化剂失活的主要原因。结果还表明，Cu0是加氢过程中的主要活性位。
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关键词:
- 失活 /
- Cu/SiO2催化剂 /
- 加氢 /
- 草酸二乙酯
Abstract: High yield of ethylene glycol (EG) can be obtainedby using the catalyst with 20% Cu loading, but the short life of the catalyst blocks its industrial application. This work focuses on the cause of the deactivation behavior. SiO2 supported copper catalyst for gasphase hydrogenation of diethyl oxalate (DEO) was prepared using the ammoniaevaporation method. The catalyst was characterized by the means of X-ray diffraction (XRD), temperature-programmed reduction (TPR) and highresolution transmission electron microscopy (HRTEM). It was found that copper particles were highly dispersed on the surface of fresh catalyst in small size, and the aggregation of them was the main reason for deactivation. In addition, the results indicated that Cu0 is the main active site for the hydrogenation.-
Key words:
- deactivation /
- Cu/SiO2 catalyst /
- hydrogenation /
- diethyl oxalate
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