carbon monoxide will become harmless carbon dioxide  and water, though this will not work properly unless lead-free  gasoline in used.
Exhaust gases are passed through a bed, or honeycomb, of small  beads coated with platinum and palladium. When it is heated and  extra air is pumped into it, environmentally-hazardous hydrocarbons  and carbon monoxide will become harmless carbon dioxide  and water, though this will not work properly unless lead-free  gasoline in used. FTP, name this pollution-control device now  required in all automobiles.
Exhaust gases are passed through a bed, or honeycomb, of small  beads coated with platinum and palladium.
{catalytic converter}