摘要
多相催化在能源工业中占据重要地位,同时对催化机理的深度认识提出了更高的要求。多数情况下,能够在反应条件下快速得到催化剂的评价和反应动力学相关信息对相关研究是极为理想的。本文介绍了最新研制的一种面向催化剂真实反应条件下具有高度操作灵活性的在线表征微反应装置,能提供液氮温区到500oC的准确控温,实现在真实催化反应条件(常压或高压)质谱在线表征。利用新装置在低温下灵活升温控制的功能,对CO预先还原的Au/TiO_2催化剂在-150oC初始条件下完成了程序升温脱附试验。以此为例,新装置在低温区的动态温控功能结合高压条件可以对相关反应提供重要测试表征,是催化常压和高压表征的有力工具。
Background： Heterogeneous catalysis plays an important role in current energy industry, which demands a deep insight of the catalysis mechanism. In most catalyst related studies, online characterization methods that can yield fast evaluation results and kinetics information under industrial reaction conditions are always desired.Purpose： A novel apparatus for operando catalytic characterization with high flexibility of controlling reaction conditions is introduced.Methods：It performs accurate temperature control from liquid nitrogen region to ~500 oC and allows mass spectroscopy （MS） online characterization from atmosphere to high pressure.Results：The apparatus is applied for a temperature programmed desorption （TPD） staring from？150 oC on an Au/TiO2 catalyst CO pre-adsorbed surface. Results show that the setup performs temperature control with good flexibility at low temperature. Conclusion：The apparatus combines features of both wide range temperature controlling and high sensitivity characterization under pressurized conditions, which makes it a powerful tool for understanding catalysis behavior under ambient or high pressure conditions.
出处
《核技术》
CAS
CSCD
北大核心
2016年第10期1-6,共6页
Nuclear Techniques
基金
国家自然科学基金(No.21573148)
上海浦江人才项目(No.15PJ1405800)资助~~
关键词
多相催化
服役状态
低温温控
高压反应
Heterogeneous catalysis
Operando analysis
Low temperature control
High pressure reaction
