In the process of ammonia synthesis, the reaction rate is slow when no catalyst is added. After adding iron as a catalyst, the reaction rate is accelerated, but the chemical properties of iron have not changed. Based on this, you can judge the following correct options? ['Catalyst iron accelerates ammonia synthesis without changing its chemical properties.', 'Catalysts can accelerate the rate of chemical reactions.', 'The intermediate process of ammonia synthesis has no effect on the properties of iron.', 'All chemical reactions require the participation of a catalyst.']