What is the process of automobile exhaust treatment?
2 Answers
Methods for automobile exhaust treatment: Using a water tank to wash and filter harmful molecules in automobile exhaust, converting them into harmless substances; Water washing: The water washing method involves using catalysts to convert CO into CO2, and HC into CO2 and H2O, etc. Commonly used catalysts include metal oxides such as manganese oxide, copper oxide, chromium oxide, nickel oxide, and precious metals like white metal. A large amount of automobile exhaust is not harmless. During the combustion of gasoline, pollutants such as nitrogen oxides are released, causing direct consequences like global warming. Hydrocarbons can form highly toxic photochemical smog, which is harmful to human health and can produce carcinogenic substances. The white smoke generated can also damage livestock, fruits, rubber products, and buildings. Introduction to automobile exhaust components: Automobile exhaust contains harmful gases such as carbon monoxide, hydrocarbons, nitrogen oxides, sulfur oxides, lead compounds, etc.
As someone who's run an auto repair shop for twenty years, I know exhaust treatment processes inside out. The core component is the three-way catalytic converter, installed on the exhaust pipe, which converts harmful gases like carbon monoxide, hydrocarbons, and nitrogen oxides into harmless water and carbon dioxide. The principle involves catalytic reactions at high temperatures using precious metals platinum, palladium, and rhodium as catalysts. Common operational issues include clogged or aged catalytic converters, leading to excessive emissions, reduced engine power, and higher fuel consumption. Solutions include cleaning or replacing the unit, paired with oxygen sensors that monitor oxygen levels in real-time and feed data to the ECU for air-fuel mixture adjustments. Newer models also incorporate Diesel Particulate Filters (DPF) to trap soot, requiring periodic high-speed driving for automatic regeneration. I recommend inspecting the exhaust system every 40,000-50,000 kilometers, using quality gasoline to prevent carbon buildup and avoid costly repairs.
