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Coupling Process of Dehydrogenation of 1,4-Butanediol and Hydro- genation of Dimethyl Maleate over CuO/SiO_2 Catalysts

SHEN, Wei YANG, Xin-Yan HUANG, Jing-Jing SHEN, Jiang DU, Jun-Ming XU, Hua-Long (Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433)  
The coupling process of dehydrogenation of 1,4-butanediol and hydrogenation of dimethyl maleate over CuO/SiO2 catalysts to produce one important fine chemical γ-butyrolactone was carried out in a continuous fixed bed reactor under atmospheric pressure. Compared to the conventional reaction process, the activities of catalysts for hydrogenation of dimethyl maleate and dehydrogenation of 1,4-butanediol were enhanced through the coupling process. Under optimum reaction conditions, the conversion of 1,4-butanediol and dimethyl maleate reached 100%, and the selectivity of γ-butyrolactone was 98%. The re- sults of XRD and TPR indicated that the optimized loading weight of CuO was about w=21%, which is in accordance with the monolayer dispersion threshold value. The active sites were Cu0, the proportion of con- gregated CuO were increased dramatically as CuO loading weight was higher than 21%.
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