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Performance Assessment of Diesel Oxidation Catalyst in On-Road 6-Cylinder Heavy-Duty Diesel Engine
Technical Paper
2020-28-0347
ISSN: 0148-7191, e-ISSN: 2688-3627
Sector:
Language:
English
Abstract
According to the latest emission standards, NOx and PM emission from on road heavy duty diesel engines need to have a dramatic reduction. To limit these emissions, an aftertreatment system consist of diesel oxidation catalyst, diesel particulate filter, selective catalytic reduction and ammonia slip catalyst is installed downstream of the engine. DOC plays the vital role in controlling CO and HC emissions in diesel engines. DOC is a flow-through monolith honeycomb structure coated with platinum group metal. As the hot exhaust gases comes in contact with catalyst, pollutants get oxidized into a harmless substance such as carbon dioxide and water.
The aim of this paper is to analyze performance of diesel oxidation catalyst. It includes HC oxidation test where raw fuel is dosed at the inlet of DOC to check HC oxidation efficiency and HC slip through DOC. In NO-NO2 oxidation test, analysis of NO oxidation efficiency of DOC by running PTP cycle is carried out. And DOC light off test is carried out to check the light off temperature of DOC where 50% concentration of gases is converted or oxidized. The focus is on the effectiveness of diesel oxidation catalyst by varying the parameters such as space velocity, HC dosing, exhaust flow rate and DOC inlet temperature. Engine testing is carried out by running emission test cycles such as WHSC and WHTC to check HC and CO emissions from engine as per the BS-VI legislation.
Keywords: Diesel Oxidation Catalyst (DOC), Space Velocity (SV), Oxides of Nitrogen (NOx), Particulate matter (PM), Carbon Monoxide (CO), Hydrocarbons (HC), Light off temperature, World Harmonized Stationary Cycle (WHSC), World Harmonized Transient Cycle (WHTC).