BM Catalysts has issued guidance regarding the impact of sub-zero temperatures on emissions control devices, including catalytic converters and diesel particulate filters (DPFs). During cold starts, reduced fuel atomisation leads to a richer air-fuel mixture and incomplete combustion, which increases the volume of unburned hydrocarbons and carbon monoxide entering the exhaust system.
The accumulation of frost, ice, and snow can also restrict exhaust gas flow, creating back pressure that may reduce engine performance. Furthermore, repeated operation in low temperatures can lead to carbon and sulphur deposits on the internal monolith, reducing the effectiveness of Platinum Group Metals (PGMs) over time.
To prevent component failure, the company recommends:
- Following manufacturer maintenance schedules.
- Allowing the engine to reach full operating temperature.
- Avoiding repeated short journeys where possible.
- Utilising smooth driving habits to manage thermal stress.
The company’s Silicon Carbide (SiC) DPF range is designed to address these challenges. SiC possesses high thermal conductivity, which helps the filter reach and maintain regeneration temperatures in cold environments. Its low thermal expansion coefficient ensures dimensional stability and structural integrity during rapid temperature fluctuations. This material combination provides resistance to thermal shock, reducing the risk of the monolith cracking during extreme cold starts.
Detailed information on the premium range can be found by clicking here..
