Although expensive, platinum is used as a catalyst to break down harmful gases in car exhaust into less harmful gases. Which statement best describes platinum in this use?
Answer
A
It is a homogeneous catalyst, so only a small amount is needed even though it exits with the products.
B
It is a heterogeneous catalyst, so only a small amount is needed and it is easily separated from the products.
C
It is a homogeneous catalyst, so although a large amount is needed, it is easily separated from the products.
D
It is a heterogeneous catalyst, so a large amount is needed and it exits with the products.