李玉娜,刘自力,左建良,王琪莹

• 1:广州大学化学化工学院
• 2:珠江三角洲水源保护与水质安全教育部重点实验室

摘要(Abstract)：

采用化学还原法制备Ni-B和Ni-Cu-B非晶态合金催化剂,考察镍源、硼镍物质的量比、铜添加量对催化剂催化加氢性能的影响。结果表明,制备催化剂的最佳条件为:氯化镍为镍源,硼镍物质的量比为4:1(mol/mol),xCu=5%(mol)(x_(Cu)=n_(Cu)/(n_(Cu)+n_(Ni)))。助剂Cu的添加增大了催化剂的吸氢能力,使得Ni-Cu-B中的金属Ni为富电子状态,而B为缺电子状态,更利于加氢反应。该反应的最佳工艺条件为反应温度160℃、氢气分压0.8 MPa以及反应时间6 h。对Ni-Cu-B非晶态催化剂的稳定性进行了测试,研究了该催化剂的失活机理,研究结果显示反应5次后催化剂的转化率和选择性分别为99.2%和51.0%,与新鲜催化剂相比(转化率和选择性分别为100%,52.9%)分别减少了0.8%和1.9%,说明催化剂在循环使用5次后活性基本保持不变;通过对反应5次后的催化剂进行表征分析发现,催化剂的比表面积和孔容均减少,并产生团聚现象,但其非晶态结构不变,说明催化剂活性缓慢降低的原因可能是反应中产生的副产物覆盖了催化剂的活性中心,导致反应物分子接触到催化剂活性中心的几率减少。

关键词(KeyWords)： Ni-Cu-B;糠醛;催化加氢;环戊酮;非晶态催化剂

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(21276054,21306031);; 应用表面与胶体化学教育部重点实验室(陕西师范大学)开放课题

作者(Author): 李玉娜,刘自力,左建良,王琪莹

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