14
2026-04
Addressing Complex Challenges: An Overview of the Catalytic Exhaust Purification Technology System for Diesel Engines
Diesel engines are widely used due to their high thermal efficiency and torque characteristics; however, their exhaust emissions are relatively complex, necessitating a combined aftertreatment technology system. The diesel engine catalyst products offered by Hunan Jiantech Co., Ltd. constitute an important component of the technological framework designed to meet this challenge.
1. Diesel Oxidation Catalyst (DOC)
The DOC is typically the first stage in a diesel aftertreatment system. Its primary purpose is to utilize the oxidation catalytic action of precious metals such as platinum and palladium to convert pollutants in the exhaust gas into harmless substances. CO and HC are oxidized to CO₂ and H₂O. Meanwhile, it can remove pollutants from exhaust gases. Nitric oxide (NO) is partially oxidized to nitrogen dioxide (NO₂). The NO₂ generated has a positive effect on the active regeneration of the downstream DPF and the efficient operation of the SCR system.
2. Catalytic Diesel Particulate Filter (CDPF)
The core function of CDPF is to capture and remove particulate matter from diesel engine exhaust gases. Particulate matter (PM, including soot) It physically traps particulate matter through a wall-flow honeycomb ceramic substrate. The catalyst coated on the CDPF (typically a precious metal) can lower the oxidation reaction temperature of soot and, utilizing NO₂ and oxygen from the exhaust gas, achieve particulate matter removal during vehicle operation. Passive regeneration and active regeneration Avoid clogging of the collector.
3. Selective Catalytic Reduction (SCR) Catalyst
SCR technology is one of the most effective methods for reducing NOx emissions from diesel engines. Its principle involves injecting a reductant into the exhaust gas under the action of a catalyst. Urea aqueous solution (as a reducing agent) It chemically reacts with NOx to produce harmless N₂ and H₂O. The SCR catalysts that Gaint Technology focuses on—commonly vanadium-based or molecular sieve-based catalysts—must possess the following characteristics: High NOx conversion efficiency, a relatively wide operating temperature window, and excellent sulfur resistance and aging resistance. 。
These catalyst units can be combined as needed to form a complete aftertreatment system, working in synergy to meet stringent emission regulation requirements.
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湖南省吉安特技术有限公司
Hunan JaTECH Inc.
No. 39, Xichong Road, Quantang Street, Changsha Economic and Technological Development Zone ，Hunan， China