Modern diesel engines use an integrated after-treatment system—comprising DOC, DPF, and SCR catalysts—to meet strict emission standards like Euro VI and EPA Tier 4. The DOC oxidizes CO and HC, the DPF traps particulate matter, and the SCR reduces NOx using urea. Beyond on-road vehicles, these systems are engineered for industrial and stationary equipment such as generators, construction, and agricultural machinery. Customized solutions are available to endure harsh conditions—high sulfur, variable loads, and extreme temperatures—ensuring compliance, durability, and optimal performance for diverse operational needs and regulatory environments.
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SCR
HOONPAI
8421320030
SCR REACTION
4NH3 + 4NO + O2→ 4N2 + 6H2O
8NH3 + 6NO2→7N2 + 12H2O
2NH3 + NO + NO2→2N2 + 3H2O
The ammonia needed for the SCR reaction comes from the hydrolysis of a urea solution:
CO(NH2)2 + H2O CO2+ 2NH3
COMPLETE SCR SYSTEM WORKING
