Business Innovation 2005

Guide to learn about the fundamentals about diesel oxidation catalyst

This kind of catalytic converter is made particularly for diesel engines and equipment, and it is capable of reducing emissions of carbon monoxide, hydrocarbons, and particulate matter all three. All kinds and uses of diesel engines may use diesel oxidation catalyst since they are simple, economical, and need no maintenance.

A look of how Diesel Oxidation Catalyst (DOC) works-

The platinum group metal catalyst is applied to a monolith honeycomb substrate and encapsulated in a stainless-steel container in modern catalytic converters. A honeycomb construction with multiple parallel channels provides a large surface for exhaust fumes to come into touch with the catalytic material.

Carbon dioxide and water are produced during the catalytic conversion process, which occurs when hot exhaust gases come into contact with the catalyst. To convert carbon monoxide, gaseous hydrocarbons, and the SOF fraction of diesel particulate matter into CO2 and H2O, the diesel oxidation catalyst is designed.

For the foregoing processes, diesel exhaust has enough oxygen. Diesel engine exhaust gas oxygen concentration ranges from 3 to 17%, depending on engine load.

Conversion of Carbon Monoxide and Hydrocarbons with the use of catalysts-

As a result, SOF reduction is outweighed by the formation of SO4 particulates. Figure 3 depicts an example of a situation in which the total DPM emissions from the engine and the catalyst are equal at 450°C.

As per data the diesel oxidation catalyst system performs differently when utilized with high sulfur fuel, enhance the overall DPM output. As a result, diesel catalysts are only being more widely used now that low sulfur diesel fuel is commercially available.

Catalytic DPM Transformation-

However, the amount of nitrogen oxide reduction activity that the diesel oxidation catalyst has will vary based on the formulation. It is not uncommon to see NOx conversions of 10%-20%. An optimum temperature for NOx conversion is about 300°C.

Soluble organic fraction of Diesel Particulate Matter (SOF) is reduced by DOCs, which also lower CO and HC (DPM). Simply said, DOCs are easy to use, low-cost, and maintenance-free, making them ideal for all diesel engine types and applications.

Filtration of Diesel Particulate Matter (DPM)-

As per data, the Soot particles from the exhaust of a diesel engine are trapped by diesel particulate filters, keeping them from entering the atmosphere. Regeneration is the process by which solid particles are removed from the exhaust stream and burnt or oxidized in the DPF itself, as opposed to the catalytic converter, which reduces gas-phase emissions passing past the catalyst.


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