摘要
以生物质(葡萄糖、蔗糖、淀粉)为模板剂,通过水热合成法制备具有核壳结构的CuO-ZnO-Al2O3@Al2O3复合催化剂,该催化剂以甲醇合成催化剂CuO-ZnO-Al2O3为核,甲醇脱水催化剂Al2O3为壳。SEM-EDS对催化剂核壳结构的表征发现,通过改变水热合成温度和合成时间可以调变催化剂中Al2O3壳层的厚度。将该复合催化剂用于合成气直接制备二甲醚的反应,在空速1 500 mL/(h.gcat)、温度260℃、压力5.0 MPa的条件下,CO转化率和二甲醚选择性分别达到35.2%和61.1%。
A core-shell catalyst CuO-ZnO-Al2O3 @Al2O3 for one-step synthesis of dimethyl ether from synthesis gas was prepared using glucose, sucrose or starch as template, and characterized by scanning electron microscopy （SEM） with energy dispersive spectroscopy （EDS）. The thickness of the Al2O3 shell in the catalyst was altered by controlling the synthesis condition, such as temperature and time. The catalytic performance of dimethyl ether （DME） synthesized from CO hydrogenation on the catalysts were investigated. The conversion of CO and the selectivity of DME on CuO-ZnO-Al2O3 @ Al2O3 achieved 35. 2% and 61. 1% at 260 ℃, 5. 0 MPa and 1 500 mL/（ h- goat）, respectively. Key words ： core-shell catalysts; syngas; dimethyl ether
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2013年第8期1003-1009,共7页
Journal of Fuel Chemistry and Technology
基金
山西省青年科技研究基金(2013021008-3)
太原市科技项目(120247-23)
关键词
核壳双功能催化剂
合成气
二甲醚
Aluminum
Catalysts
Energy dispersive spectroscopy
Scanning electron microscopy
Shells (structures)
Synthesis gas
Zinc oxide
