Thermal and Poisoning Effects on the Performance of Motorcycle Emission Control Catalysts

Tyo, M. A.; Palke, D. R.

doi:10.4271/1999-01-3301

Cited by 4 publications

(2 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been shown that motorcycles emissions exceed the emission levels of modern light gasoline passenger cars. , The application of oxidation catalysts as exhaust after-treatment devices is more common for motorcycles. , Propylene is commonly used as a representative of hydrocarbons in the exhaust gas. Motorcycle catalysts can reduce CO and C 3 H 6 emission factors by 60–80%, and the reduction for PM has been reported to be more than 50% . It has been shown that the exhaust emissions from Euro-3 motorcycles can be reduced in hot operation mode using after-treatment catalysts .…”

Section: Introductionmentioning

confidence: 99%

“…Motorcycle catalysts can reduce CO and C 3 H 6 emission factors by 60−80%, and the reduction for PM has been reported to be more than 50%. 13 It has been shown that the exhaust emissions from Euro-3 motorcycles can be reduced in hot operation mode using after-treatment catalysts. 9 Emission level measurements for two-stroke scooters during chassis dynamometer tests have shown that application of a wiremesh filter catalyst in combination with an oxidation catalyst can substantially reduce emission levels of HC, CO, and PM.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Beneficial Role of Oxygen in CO and Propylene Oxidation over a Pt–Pd-Based Wiremesh Catalyst as a Retrofit Emission Control Device for Four-Stroke Gasoline Spark-Ignited Motorcycles

et al. 2021

View full text Add to dashboard Cite

Over 200 million motorcycles in use worldwide account for a substantial portion of global mobile source total hydrocarbons (THC) and carbon monoxide (CO) emissions. In Tehran, capital of Iran, ultrarich inefficient combustion in gasolinefueled motorcycles results in significantly high CO and THC emissions. Motorcycle catalysts can reduce CO and C 3 H 6 (as a representative hydrocarbon) emission factors by 60−80%. In the present work, CO and propylene oxidation over a commercial Pt− Pd-based wiremesh catalyst is studied in a flow reactor setup under simulated conditions relevant to 125 cc four-stroke gasoline carburetor motorcycles. Steady-state individual and co-oxidation tests for CO and C 3 H 6 oxidation under rich, stoichiometric, and lean conditions indicated that increasing oxygen concentration shifted the light-off profile toward lower temperatures. Kinetics of CO and C 3 H 6 oxidation were studied. For co-oxidation of CO and C 3 H 6 , the apparent activation energies of CO and C 3 H 6 oxidation were decreased by increasing oxygen concentration, indicating the positive role of oxygen in the reaction progress. The obtained reaction orders indicated the self-and mutual-inhibition effects of CO and C 3 H 6 . The highly positive order for O 2 confirmed the beneficial effect of oxygen. Our results suggest that injecting secondary air in the motorcycle exhaust gas can be used as a practical technique for enhancing CO and hydrocarbon oxidation efficiency over a Pt−Pd/CeO 2 −ZrO 2 −Al 2 O 3 wiremesh catalyst.

show abstract