This question refers to the emissions control equipment used on modern vehicles. A vehicles catalytic converter may used platinum and palladium substrates to bind with CO and NOx to change them into ideally water, carbon dioxide, nitrogen and oxygen only emissions.
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Ozone depletion is primarily caused by the release of chlorofluorocarbons (CFCs) and halons into the atmosphere, which break down ozone molecules. Unburned hydrocarbons can contribute to the formation of ground-level ozone, a component of smog, but are not the main cause of ozone depletion in the stratosphere.
A Catalytic Converter reduces unburned exhaust gasses.
Catalytic converter. A device that use platinum as a catalyst to reduce unburned hydrocarbon emissions from your vehicles exhaust.
In very basic terms, catalytic converters contain any or all of the following precious metals which are catalysts used to react with heat and hydrocarbons (unburned fuels) to reduce emissions. Commonly found is Platinum / Palladium /and Rhodium
A catalytic converter changes unburned hydrocarbons into carbon dioxide and water vapor. It's a simple chemical process, and like most chemical processes, it will either generate or absorb heat so in this case, since the catalytic converter requires heat to change the state of the hydrocarbons, it either has to be heated or it will operate quite effectively using the exhaust heat. Note, if the engine is operating efficiently there should be very little for the catalytic converter to do.
Internal combustion engines don't emit cloroflorocarbons, but they do emit hydrocarbon's. Hydrocarbons are/is unburned fuel which can be caused by a number of things,but it all leads back to unburned fuel.
The unburned gasoline accumulated in the crankcase is recirculated by the PCV valve to the intake air and burned again. The unburned gasoline in the exhaust reacts inside the catalytic converter, making carbon dioxide and water.
The ideal exhaust has no unburned gas in it. Since this hardly happens, a system to clean up air pollution was created. On the exhaust stroke of your engine, unburned fuel is forced out of your cylinder by the piston. That unburned fuel then makes it's way to the catalytic* converter. The catalytic converter basically gets hot to burn your unburned fuel and puts out the combustionally correct gasses. It is possible that your catalytic converter is the reason your van is spit and sputtering, but there are also many other reasons this could occur such as: timing vacuum fuel pressure air spark Signs that it could be your catalytic converter include: abnormally loud converter abnormally shaky converter hope this is somewhat helpful
Assuming the engine is tuned correctly and there is a minimal amount of unburned fuel reaching the converter, it should last as long as the car itself. They break down quickly however when a vehicle has a series of misfires causing unburned fuel to reach the converter. If this happens the check engine or MIL light will flash when the converter is being ruined.
The catalytic converter reduces carbon monoxide, as well as unburned hydrocarbons. The EGR system introduces exhaust gas to the intake, creating a lower combustion temperature, and in turn less oxides of nitrogen. There are more advanced systems on newer cars, but these are the basics. .................... Curtis TheFreeMechanic.com (Free car care videos. Mechanic's tips on DIY maintenance, and buying parts online)
The emissions are mainly nitrogen, carbon dioxide, NOx, water vapour and unburned hydrocarbons