AS Chemical-problem Watch

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David_Frank
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#1
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#1
Questions with Catalytic Converter.

Now the question is :
Suggest one reason why the exhaust fumes from a car fitted with a catalytic converter are still hazardous to human health to some degree.

here are two suggested answers :
1. catalytic converter is not always efficient, they works well only when temp. is high enough.
2. high percentage of CO2 can cause suffocation too .

which one you think is the best answer?
(not necessarily be these two, if you have better suggestion...)

TIA...
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qqqwwweee
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#2
Report 14 years ago
#2
(Original post by David_Frank)
Questions with Catalytic Converter.

Now the question is :
Suggest one reason why the exhaust fumes from a car fitted with a catalytic converter are still hazardous to human health to some degree.

here are two suggested answers :
1. catalytic converter is not always efficient, they works well only when temp. is high enough.
2. high percentage of CO2 can cause suffocation too .

which one you think is the best answer?
(not necessarily be these two, if you have better suggestion...)

TIA...
em...
1. i think
Inside a catalytic converter, the exhaust gas is "cleaned" by its reactions with heterogenous catalysts (Pt, Rh). Although the design can greatly increase the surface area, there must be some exhaust gas left unreacted.

On the other hand, although the conc. of CO2 is high, no one will put his head close to the exhaust pipe. Suffocation is caused by lack of oxygen and a high percentage of CO2 can only increase the breathing rate. So the second statement is surely not the best answer. The most serious effect caused by CO2 is the greenhouse effect which is harmful to the environment but not human health directly.
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igloo
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Loads of older models of cars are still being used, that don't have catalytic converters.
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