Chemical reaction engineering has made a significant contribution to the commercialization of laboratory-developed chemistry. Reaction engineering can be used to analyse reactions, identify rate-limiting processes, calculate overall rates, choose reactor configurations, and design and scale-up reactors. Insights into catalytic cycles and clues for optimizing catalyst systems can also be gained through reaction engineering. Chemical reactions are fundamental to the transformation of molecules from basic materials to useful products and energy. Many of these changes rely on catalysis, which leads to more efficient and environmentally friendly processing methods. Catalysts are complicated materials that must meet a number of criteria on a variety of scales in order to be used in catalytic processes. For this, an integrated approach is needed, one that considers sustainability and scalability while combining modelling and experiments, catalysis science, and chemical engineering.