What raw materials are used to make vehicle urea?

[VonDawson]

The raw materials for urea production are carbon dioxide and ammonia. Vehicle urea is primarily used to reduce harmful nitrogen oxides in exhaust gases into nitrogen and water. It is generally used in diesel vehicles. Below are the detailed details: 1. Principle: The main harmful substances in diesel vehicle exhaust are nitrogen oxides and particulate matter. Technical measures can be employed within the engine to reduce particulate emissions, leaving mainly nitrogen oxides in the exhaust. Urea is injected into the exhaust after-treatment device, where it decomposes into ammonia at high temperatures. Under the action of a catalyst, the ammonia reacts with nitrogen oxides to produce harmless nitrogen and water. This device is called the SCR (Selective Catalytic Reduction) after-treatment system. 2. Urea Tank: Vehicles have a dedicated urea tank where the urea is stored. As long as the vehicle is running, urea will be consumed, so it needs to be replenished in a timely manner. Generally, about 4 liters of urea are consumed per 100 liters of diesel fuel.