基于尺度视角下的“催化剂”拓展课教学

Teaching of Extended Catalyst Course Based on Scale Perspective

通过对Fe3+催化过氧化氢分解的实验过程的探究,证实了有的均相催化剂参与反应后化学性质是有改变的,完善了对催化剂概念的认识。进一步基于尺度视角设计并制备了新型的非均相催化剂磁性Fe3O4纳米粒子,并对其催化双氧水分解的过程进行了实验探究,对其是否损耗与Fe3+的催化过程形成对比,对均相催化剂和非均相催化剂进行了比较与评价。以尺度为思考问题的出发点,引导学生理解科研前沿(单原子催化剂)的设计思想,构建学生认识物质的尺度观念,促进学生进一步认识科学本质和学科价值,培养学生的创新意识。

In this paper,the experimental process of hydrogen peroxide decomposition catalyzed by Fe3+was explored.It was proved that the chemical properties of some homogeneous catalysts changed after they participated in the reaction.It helped students to understand the concept of catalyst thoroughly and comprehensively.Then,the comparison and summary of homogeneous catalysts and heterogeneous catalysts were made,especially the influence of scale on the activity of catalysts.In this paper,a new type of heterogeneous catalyst magnetic Fe3O4 nanoparticles was designed and prepared from a scale-based perspective,and its catalytic decomposition process of hydrogen peroxide was investigated experimentally.It was compared with the catalytic process of Fe3+.The scale-based approach was taken as the starting point for thinking about the problem.It guided students to understand the design idea of the frontier of scientific research(monoatomic catalyst)and constructed students’understanding.The concept of material scale promoted students to further understand the nature of science and subject value,and cultivates students’innovative consciousness.