【摘要】 生物质利用是缓解能源及环境危机的有效途径。本文利用共沉积法制备了一系列CuZn/Al₂O₃催化剂,通过电感耦合等离子光谱（ICP）、X射线粉末衍射（XRD）、透射电子显微镜（TEM）、二氧化碳程序升温脱附（CO₂-TPD）等表征技术对催化剂的结构及性质进行了表征。重点讨论了还原温度对CuZn/Al₂O₃催化γ-戊内酯加氢反应催化性能的影响,研究发现还原温度显著影响催化剂的活性和选择性。高温还原有利于γ-戊内酯加氢生成1,4-戊二醇,440℃还原的CuZn/Al₂O₃催化剂对1,4-戊二醇的选择性可高可达98%;而200℃还原的催化剂,在相似的转化率下1,4-戊二醇选择性仅为71%。结合催化剂的结构分析,高温有利于ZnO的还原,促使催化剂表面生成新的活性位点,并改变了催化剂表面的酸碱性,促进了1,4-戊二醇的生成。更多还原

【Abstract】 Biomass conversion is one of the most effective ways for alleviating the energy and environmental crisis. A series of CuZn/Al₂O₃ catalysts was prepared by co-precipitation method and the structure and properties of the catalysts obtained were characterized by several techniques such as inductively coupled plasma（ICP）, X-ray diffraction（XRD）, transmission electron microscopy（TEM）, and CO₂-temperature programmed desorption（TPD）. We focused our attention on the effects of reduction temperature on the catalytic performances of CuZn/Al₂O₃ catalysts in γ-valerolactone hydrogenation. It is found that reduction of temperature significantly influences the activity and selectivity of CuZn/Al₂O₃ catalysts, that is, the larger reduction temperature benefits for the formation of 1,4-pentanediol, and a high selectivity of 98% is achieved over the catalyst at 440 ℃, while it is only 71% on the catalyst reduced at 200 ℃. Based on the structure analysis of the catalyst, it is concluded that the high reduction temperature can promote the reduction of ZnO and generate new surface active sites and vary the surface basic-acid properties, thus result in the improvement of 1,4-pentanediol selectivity.更多还原