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Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
ISBN: 9781133612315

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BuyFindarrow_forward

Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
ISBN: 9781133612315
Textbook Problem

While discussing SCR systems: Technician A says that they are used in place of a conventional catalytic converter to reduce NOx, CO, and HC. Technician B says that the most common reductant used is SCR systems is an ammonia-like substance called urea. Who is correct?

a. Technician A only

b. Technician B only

c. Both A and B

d. Neither A nor B

To determine

The correct technician among A and B who are discussing the SCR systems

Explanation

The use of conventional catalytic converter rather than the selective catalytic reduction (SCR) is not acceptable, as SCR introduces a reductant substance in the catalyst and is used in addition to the catalytic converter. Further, the SCR reduces nitrogen oxide emissions but it does not reduce HC and CO gases. This implies that technician A is not correct.

As it is discussed, SCR introduces a reductant substance in the catalyst. Such reductants are mostly of two types, that is, ammonia and urea water solutions...

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