Effect of Diesel Oxidation Catalysts on the Diesel Particulate Filter Regeneration Process
58
Citation
50
Reference
10
Related Paper
Citation Trend
Abstract:
A Diesel Particulate Filter (DPF) regeneration process was investigated during aftertreatment exhaust of a simulated diesel engine under the influence of a Diesel Oxidation Catalyst (DOC). Aerosol mass spectrometry analysis showed that the presence of the DOC decreases the Organic Carbon (OC) fraction adsorbed to soot particles. The activation energy values determined for soot nanoparticles oxidation were 97 ± 5 and 101 ± 8 kJ mol(-1) with and without the DOC, respectively; suggesting that the DOC does not facilitate elementary carbon oxidation. The minimum temperature necessary for DPF regeneration was strongly affected by the presence of the DOC in the aftertreatment. The conversion of NO to NO(2) inside the DOC induced the DPF regeneration process at a lower temperature than O(2) (ΔT = 30 K). Also, it was verified that the OC fraction, which decreases in the presence of the DOC, plays an important role to ignite soot combustion.Keywords:
Carbon fibers
Diesel exhaust fluid
Catalytic Oxidation
Cite
Citations (93)
The main pollutant of diesel engine exhaust is introduced,and its formation mechanism is also presented.On the base,the ways of reducing emission,including in-engine combustion process and in-engine exhaust,especially about electronically control technical,Selective Catalytic Reduction Method(SCR),Diesel Particulate Filter(PDF),are indicated.At last,the prospect for diesel engine emission control way is showed,and it was discussed that diesel engine emission control way is applied in China.
Diesel exhaust fluid
Emission standard
Selective catalytic reduction
Cite
Citations (0)
Compared to gasoline engines, diesel catalytic exhaust aftertreatment is complicated by two additional problems: the emission of soot and the fact that NO x reduction is difficult in an environment with excess oxygen. The application of catalyst of diesel engines has to be adapted to their lower exhaust gas temperature compared to that of stoichiometric gasoline engines. The diesel oxidation catalyst (DOC) is a standard equipment for diesel vehicles since the 1990s. Oxidation catalysts can reduce the mass of particulate emissions. Besides solid carbon, diesel particulate contains liquid hydrocarbons, so-called soluble organic fraction. Special application of the DOC is its use as a heatup catalyst for particulate filter regeneration. In contrast to the catalytic conversion of the gaseous pollutants, removal of particulate matter is a physical separation process. The conventional three-way catalysts cannot remove NO x from lean exhaust gas because the reduction of NO by CO, H 2 , or hydrocarbons is inhibited by excess concentration of oxygen.
Diesel exhaust fluid
Selective catalytic reduction
Fraction (chemistry)
Secondary air injection
Catalytic converter
Cite
Citations (0)
Abstract In this research, CeO2 was chosen for the DOC catalyst. Moreover, a partial-flow DPF was installed after DOC. The exhaust gas experiment was conducted at 20% - 50% engine load varying 1000,1500, and 2000 rpm of engine speed. The research results show that NOx reduced around 25% with CeO2 DOC and DPF systems at higher engine load. On the other hand, particulate matters decrease around 65% after CeO2 DOC and DPF systems. Furthermore, CO and HC amount were substantially reduced after applying after-treatment systems. According to fuel consumption, BSFC, and BTE results, the after-treatment system has no significant impact on engine performance.
Diesel exhaust fluid
Cite
Citations (0)
Abstract Based on the analysis of the diesel engine post-processing technology line, a DOC-DPF tail gas treatment device is proposed. The exhaust system of marine diesel engine is reformed, the particulate matter purification test is carried out in the exhaust system installation DOC-DPF tail gas treatment device, and the exhaust particulate matter of the marine diesel engine is detected by the automatic smoke tester and other instruments. The results show that the new ship exhaust particulate disposal device can effectively reduce particulate emissions from ship exhaust and is suitable for ships.
Diesel exhaust fluid
Secondary air injection
Cite
Citations (1)
A major concern in operating a diesel engine is how to reduce the soot emission from the exhaust gases, as soot has a negative effect on both human health and the environment. More stringent emission regulations make the diesel particulate filter (DPF) an indispensable after-treatment component to reduce diesel soot from exhaust gases. The most important issue in developing an effective DPF, however, is regeneration technology to oxidize the diesel soot trapped in the filter, either periodically or continuously, during regular engine operations. Various methods exist for regenerating diesel soot captured by the filter. Of these, NO2 is widely used for continuous regeneration of diesel soot since it can oxidize diesel soot at lower temperatures than the conventional oxidizer O2 In this work, after introducing governing equations for trapping and regenerating diesel soot in the DPF, regeneration behavior is examined by changing such various parameters as exhaust gas temperature and O2 concentration. Numerical investigation is then performed in order to find the optimum NO2/soot ratio required for continuous regeneration of the soot deposited in the DPF.
Cite
Citations (21)
Composition and health impact of particulate matter from diesel vehicle exhaust are analysed.A diesel particulate filter technology,which is called Fuel Borne Catalyst Diesel Particulate Filter,is introduced in this paper.Based on diesel bench test,the improved effect of diesel particulate matter is discussed in detail.Meanwhile,the forced regeneration process of Diesel Particulate Filter and the influence of DPF on the diesel engine are studied.The test results show that the FBC-DPF has a good prospect of application.
Diesel exhaust fluid
Cite
Citations (0)
Reactivity
Cite
Citations (2)
It was studied the effect of sulfur content in diesel fuel on diesel smoke emission. 62 pieces of diesel vehicle were tested by filter paper smoke measurement method under free acceleration mode, compared the difference of exhaust smoke using two diffrence types of fuel, high sulfur diesel and low sulfur diesel.And it is found the lower the sulfur content,the lower the exhst smoke. And it was studied the effect of exhaust purification device on sulfuric acid salt contained in diesel exhaust particulate by engine test. And it is concluded Pd/γ-Al_2O_3 catalyst increase the content of sulfuric acid salt in exhaust particulates.
Diesel exhaust fluid
Cite
Citations (0)
In this research we apply Laser Induced Breakdown Spectroscopy technique for diagnostics of Diesel Particulate Matter - DPM formed from combustion Diesel engine - exhaust emissions. Particularly we are concern with the measurements of main chemical components of particulate matter, from actual Diesel engine passenger vehicles. Here we analysed DPM from different Diesel engine passenger vehicles of major EU brands car producers used in daily life environment by LIBS technique. The aim of this study is to reveal the compounds, which are mostly present in the Diesel engine exhaust emissions and can affect the overall composition of the DPM. The presence of these elements in exhaust emission may point to different processes, mainly to fuel quality, insufficient engine combustion process, incomplete catalytic reaction, inefficient Diesel particulate filtering technique, or failure in the Diesel engine.
Diesel exhaust fluid
Cite
Citations (3)