>1. Are catalytic converters only used on diesel vehicles?
No but converters on diesel vehicles use a greater proportion of platinum. Palladium is often substituted on petrol vehicles.
>2. Are a greater proportion of vehicles being fitted with them?
Pretty much all vehicles have them these days.
>3. While growth in motor vehicle sales continues at 6% in China, will this growth offset the reduction in sales from germany/us.
China recently overtook the US as the biggest car market so you could consider them as roughly equal. That means in the short term the answer is no, longer term - almost certainly.
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