Reduction of White Smoke Emission Derived from Hydrocarbons by Applying an Alumina with Small Specific Surface Area to Diesel Oxidation Catalyst

ディーゼル酸化触媒への低比表面積アルミナ適用によるHC由来白煙の低減

White smoke emission is observed at tailpipe of diesel engine when unburned hydrocarbons (HCs) are stored on diesel oxidation catalyst (DOC) under low gas temperatures. In this research, it was investigated that effects of HCs adsorbed on alumina and zeolite coated on DOC for white smoke emission by change of zeolite content and specific surface area (SSA) of alumina. HCs poisoning on platinum group metal (PGM) may occur by rapid HCs desorption from zeolite and degrade the HCs oxidation performance of DOC, leading to white smoke emission. Therefore, adopting small SSA alumina to DOC can reduce the adsorbed HCs amount on alumina inhibiting HCs poisoning on PGM, thus improve HCs oxidation performance. This improvement achieved not only the reduction in white smoke emission but also the improvement of HCs and carbon monoxide clarification during New European Driving Cycle mode compared to conventional DOC specifications.排ガス温度の低い低負荷条件ではエンジンから排出される未燃HCがディーゼル酸化触媒に吸着し,排気温度が上昇した際に脱離するHCの一部が白煙として排出される.本研究では,触媒表面におけるHC吸着・脱離から白煙排出までの一連の白煙発生メカニズムを明らかにした上で,触媒諸元の改良による白煙抑制手法を提案する.

Language

  • English
  • Japanese

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01660138
  • Record Type: Publication
  • Source Agency: Japan Science and Technology Agency (JST)
  • Files: TRIS, JSTAGE
  • Created Date: Jan 31 2018 3:23PM