论文部分内容阅读
介绍一种动态—原位红外技术,采用这一技术可以获取在催化剂表面上生成的中间化合物的特征光谱信息。根据特征峰出现的先后,峰的大小和消长以及形成的时间,可以直接地、更有论据地推断反应机理,比目前采用“黑箱”的方法优越。通过标定特征峰与表面浓度的关系,可以研究表面中间化合物生成的复杂反应网络,求出相应的动力学参数和最慢的速控步骤。利用上述技术还可以发展一种“化学捕获”法,直接证明催化剂表面存在的中间化合物。
A dynamic-in-situ infrared technique is introduced that uses this technique to obtain characteristic spectral information of intermediate compounds generated on the catalyst surface. According to the appearance of the peak, the size of the peaks and the growth and decline as well as the time of formation, the reaction mechanism can be directly and more inferred, which is superior to the current “black box” method. By calibrating the relationship between the characteristic peak and the surface concentration, we can study the complex reaction network formed by the intermediate compounds on the surface and find out the corresponding kinetic parameters and the slowest speed control step. Using the above techniques, it is also possible to develop a “chemical capture” method that directly proves the presence of intermediate compounds on the catalyst surface.