What is the purpose of adding urea to heavy-duty trucks?

1 Answers
VonAllie
07/30/25 8:07am
Diesel engines use urea to catalyze nitrogen oxides (NOx) emitted from the engine. During operation, diesel engines produce harmful nitrogen oxide gases that pollute the atmosphere and pose health risks. When urea comes into contact with these NOx emissions, a chemical reaction occurs, converting them into harmless nitrogen and water vapor. Below are relevant details: 1. Urea standards: In China, qualified urea solutions typically consist of 32.5% high-purity urea mixed with purified water. This solution undergoes a reduction reaction with NOx, producing nitrogen, oxygen, and water, thereby reducing nitrogen oxide emissions. This method is applicable to all Euro IV and Euro V compliant diesel engine SCR systems. 2. Hazards of inferior urea: A truck's power and fuel consumption can be affected by urea quality. If a diesel vehicle lacks proper exhaust treatment systems or uses substandard products, it may trigger automatic engine deceleration and damage the SCR catalytic converter's catalyst.
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