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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DPF
HOONPAI
2097594, 2102903, 2141164, 2179961 2269640, 2494028, 2494029,2503085, 2503087, 2575576,2004103 570757, 570759, 570761, 570762, 570768,2359384, 2577090, 570749, 570758, 570763, 570764, 570808 2137598,
Working Principle of DOC+CDPF
Doc: Oxidation of No to No2 and removal of CO and HC.
CDPF: the captured carbon particles react with NO2 at low temperature to produce CO2 emissions.
Reactions in CDPF
