张博,倪文金,贾爽,付金凤,杨谦

• 1:新疆理工学院能源化工工程学院
• 2:衡阳师范学院化学与材料科学学院
• 3:功能化金属有机化合物湖南省重点实验室

摘要(Abstract)：

环己酮肟是合成己内酰胺的关键中间体，文中开发了一种绿色、高效的无溶剂液相催化工艺，利用分子氧选择性氧化环己胺制备环己酮肟。采用磷酸改性制备了双功能P-TiO_2催化剂，并系统考察了P/Ti物质的量比、焙烧温度、反应时间、温度、氧气压力及催化剂用量等因素对反应的影响。在优化条件下(0.4 g 0.5P-TiO_2@300℃，95℃，1.0 MPa,2.5 h)，环己胺转化率达47.4%，环己酮肟选择性高达87.0%。该催化剂展现出优异的稳定性，连续重复使用6次后活性未明显下降。表征结果表明，磷酸的引入在显著增大催化剂比表面积的同时，构建了丰富的表面羟基和布朗斯特酸位点，二者分别作为环己胺的吸附活化与关键重排步骤的催化位点，协同实现了环己胺液相氧化反应的高活性和高选择性。本工作不仅开发了一种高性能催化体系，更为通过精准构建表面功能位点以实现有机胺类化合物的绿色选择性转化提供了新的设计思路。

关键词(KeyWords)： 环己胺;环己酮肟;磷酸改性TiO_2;双功能催化剂;无溶剂氧化

Abstract:

Keywords:

基金项目(Foundation): 湖南省自然科学基金(2025JJ60092);; 湖南省教育厅重点项目(24A0507);; 衡阳师范学院启动项目(2023QD20)

作者(Author): 张博,倪文金,贾爽,付金凤,杨谦

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