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What is the difference between a three-way catalytic converter and a muffler?

2023-02-28

1. The functions of the two are different:

(1) The three-way catalytic converter is the most important external purification device installed in the automobile exhaust system. It can convert harmful gases such as CO, HC and NOx emitted from automobile exhaust into harmless carbon dioxide through oxidation and reduction. water and nitrogen;

(2) The muffler refers to the airflow pipeline with noise transmission at the same time. It can use noise reduction devices such as pipes and elbows with sound-absorbing linings or pipes with sudden changes in cross-sectional area and other pipes with discontinuous acoustic impedance. Noise is attenuated or reflected back.

2. The working principles of the two are different:

(1) The working principle of the three-way catalytic converter is:

When the high-temperature automobile exhaust gas passes through the purification device, the purification agent in the three-way catalytic converter will enhance the activity of the three gases CO, HC and NOx, and promote them to undergo a certain oxidation-reduction chemical reaction, in which CO is oxidized at high temperature to become non-toxic. Color, non-toxic carbon dioxide gas; HC compounds are oxidized to water (H20) and carbon dioxide at high temperature; NOx is reduced to nitrogen and oxygen.

(2) The working principle of the muffler is:

Perforate a thin plate with a diameter less than or equal to 1.0mm on a thin plate with a thickness of less than 1.0mm, the perforation rate is 1-5%, and a certain thickness (5-20cm) air layer is left at the rear, and this layer is not filled with any sound absorption material, which constitutes the sound-absorbing structure of micro-perforated panels. It is a resonant sound-absorbing structure with low sound quality and high sound resistance.