Читать книгу Heterogeneous Catalysts - Группа авторов - Страница 79

SACs have attracted much attention in the catalysis community due to the maximum atom use efficiency and unique catalytic properties. However, due to the excess surface free energy of SAs, SAs tend to aggregate into larger particles at elevated temperatures or during catalytic reactions [38, 43–45], resulting in a decrease or even complete loss of catalytic activity. Thus, it is challenging to fabricate SACs with high‐loading SAs dispersed finely and densely. Significant progress has been made in recent years to develop various methods for the synthesis of SACs. Here we summarize a few common methods that can be divided into two categories, i.e. physical and chemical methods. The chemical method can also be categorized into two types: bottom‐up and top‐down methods.