CatalyticConverters01
Multiple choice question
The following table illustrates the changes in emissions requirements for automobiles:
Catalytic converters are used in automobiles to convert pollutants in engine emissions to benign products. Catalytic converters in today's automobiles are made of a porous ceramic brick that has been coated with catalysts, additives, stabilizers, and support materials. Corning has developed bricks that have very thin-walled channels with 600 channels per square inch. Which of the following research goals did they target?
| Pollutant | 1970 Emissions | 1990 Emissions | CA ultra-low emissions |
|---|---|---|---|
| CxHy | 1.5 g/mile | 0.25 g/mile | 0.04 g/mile |
| CO | 15 g/mile | 3.4 g/mile | 1.7 g/mile |
| NOx | 3.1 g/mile | 0.4 g/mile | 0.2 g/mile |
 | Catalytic converters need to have a high surface area. |
 | Catalytic converters need to withstand rapid temperature fluctuations. |
| The catalyst has to last at least 100,000 miles. |
| The catalyst needs to be stable at high temperatures. |
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