Question

Diesel fuel contains sulphur impurities, and this leads to poisoning of the catalyst materials.

(a) True

(b) False

I have been asked this question in final exam.

The above asked question is from C.I. Engines in chapter Engine Emissions and their Control of IC Engine

Answer 1

The correct answer is:

(a) True

Diesel fuel contains sulfur impurities, and these can indeed lead to poisoning of the catalyst materials in the exhaust treatment system. Sulfur can react with the catalyst to form sulfur compounds that reduce the effectiveness of the catalyst, impairing its ability to reduce emissions such as nitrogen oxides (NOx) and carbon monoxide (CO). This is one of the reasons why ultra-low sulfur diesel (ULSD) is commonly used in modern diesel engines to reduce emissions and prevent catalyst degradation.