在制取氧气的实验中,我们接触到一种新物质——催化剂.催化剂是指在化学反应里能改变反应物的化学反应速率,但本身的质量和化学性质在化学反应前后都没有发生改变的物质.据统计,约有90%以上的工业过程都使用催化剂,如化工、石化、生化、环保等行业都要用到催化剂.在制取氧气的过程中加入了二氧化锰,制取 In the oxygen production experiment, we came into contact with a new material, the catalyst, which refers to the chemical reaction that changes the chemical reaction rate of the reactants, but its quality and chemical properties have not changed before and after the chemical reaction According to statistics, about 90% of the industrial processes are using catalysts, such as chemical, petrochemical, biochemical, environmental protection and other industries have to use the catalyst in the oxygen production process by adding manganese dioxide,