Question

____________ are materials that absorb selected molecular compounds and catalyze chemical reactions.

(a) Catalysts

(b) Chromium

(c) Zeolite

(d) None of the mentioned

The question was asked in unit test.

This question is from Reducing Emissions by Chemical Methods topic in division Engine Emissions and their Control of IC Engine

Answer 1

The correct answer is:

(a) Catalysts

Catalysts are materials that absorb selected molecular compounds and catalyze (accelerate) chemical reactions. In the context of engine emissions control, catalysts are used in devices like catalytic converters to facilitate reactions that reduce harmful emissions like hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOx).