Guess what it is: We all have them in our cars, where they clean exhaust gases. Almost no industrial production can do without them today, as they reduce the energy needed for reactions to occur. So they save manufacturers a lot of money. They clean waste gases from the production of goods or energy, for instance, at MCHZ in Ostrava during nitric acid production. Moreover, they can be used repeatedly because they do not change or get consumed during the reaction. Yes, meet catalysts and catalytic reactions, which play a significant role in positively transforming the environment.