Engine is the heart of every car, where the energy of chemical reaction of petroleum combustion is transformed to mechanical energy, which makes the car move. Unfortunately, none of engines are environmentally friendly. Carbon monoxide, nitrogen oxides, hydrocarbons and other dangerous compounds are contained in the exhaustive gas mixture. In order to protect the environment from these toxic gases, every modern car is equipped with autocatalyst, which converts exhaustive gases to non-toxic water, nitrogen and carbon dioxide.