But the violation of marriage, or any other unchastity, was never heard of; and the married pair pass their lives with the same friendship and mutual benevolence, that they bear to all others of the same species who come in their way, without jealousy, fondness, quarrelling, or discontent.
The catalyst used in the converter is mostly a precious metal such as platinum, palladium and rhodium. Platinum is used as a reduction catalyst and as an oxidation catalyst. Although platinum is a very active catalyst and widely used, it is very expensive and not suitable for all applications.
Vehicles fitted with catalytic converters emit most of their total pollution during the first five minutes of engine operation; for example, before the catalytic converter has warmed up sufficiently to be fully effective.