CO THC NO2 NOx Removal CDPF Catalyst Used In Doc Continuous Passive Regeneration

Continuous Passive Regeneration DOC+CDPF Catalyst Remove CO/THC / NO2/NOx

Product Description

CDPF relies on the extremely high oxidizability of NO2 to realize its continuous passive re-production Health; The reaction speed of SCR under different NOx components is different, and it is increased appropriately NO2 is beneficial to speed up the reaction, and the ideal NO:NO2 ratio is 1:1, because This NO2 content is very important for downstream CDPF and SCR performance, in order to be more Compare the effects of DOC with different formulas on post-processing system, and compare DOC with doc The average NO2/NOx ratio after CDPF and after CDPF were counted. It can be seen that the average NO2/NOx ratio after CDPF is higher than that after DOC Average NO2/NOx after DOC and CDPF under different DOC formulations The difference of the ratio is not the same. When the precious metal load is large, the difference is larger Small, when the precious metal load is small, the difference increases with the high Pt/Pd ratio And decrease. NO will occur in the precious metal coating area of the deep bed of the particulate trap The oxidation reaction is in the high concentration area of NO2, and NO2 and soot in the cake layer The reaction occurs in the low concentration area of NO2, and the concentration difference of NO2 will drive NO2 Diffusion, passive regeneration of multiple reactions, if used for particles Oxidation of NO2 consumption is less than NO2 production, NO2 after CDPF Increase in concentration. When DOC adopts high precious metal loading or high Pt/Pd ratio, The formula, into the CDPF NO2 concentration is high, on the one hand, due to NO2 Diffusion, may adhere to the active site of precious metals, and adsorb NO to form a Set the inhibition, on the other hand for NO+O2=NO2 reaction, increase NO concentration is beneficial to increase the chemical reaction rate. This phenomenon shows that although High NO2 concentration after DOC is beneficial to oxidation of particulate matter in CDPF, but CDPF The noble metal in the can also continue to oxidize NO, so it is not necessary to obtain high NO2 to excessively increase the precious metal coating amount of DOC.

Company Information

Grace Environmental Protection Technology Co., Ltd. is a technical enterprise specialized in various types of exhaust gas treatment. The team has rich internal combustion engine exhaust gas and VOC treatment experience and more than ten years of working experience, and is a very few suppliers with the ability to design the whole process from catalyst to overall solution. At present, the products cover all kinds of exhaust catalysts, DOC,CDPF,SCR,ASC, etc. At the same time, they cover waste liquid treatment and indoor air purification, providing customers with the most competitive products and services. At present, the company has passed the certification of ISO14001 environmental management system, ISO9001 international quality certification, AAA enterprise credit rating and other certifications, and has an annual output of 500,000 litres of catalyst production coating line, complete quality management system and process control. Various performance testing capabilities, including SRD,SRF,ICP,BET, etc.!