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A precatalyst is something that is going to be converted in a catalyst later in the reaction. Precatalysts are easier to store than catalysts.
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∙ 9y ago
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How many moles of precatalyst are used in this reaction?
This is specific to a reaction that must be provided
Are the two censors on the exhaust of a 2002 dodge ram van both oxygen censors and do you really need them?
Yes, and yes.One is the precatalyst and the other is the downstream. Used to measure the efficiency of the converter.
How many moles of precatalyst H2ptcl6 are used in this reaction?
The number of moles of catalyst depends on the reaction under consideration. Compared to the substrate, about 10-2 to 10-6 times of the catalyst can be used. The lower the amount of the catalyst, the more effective it is.
What is the difference between a precatalyst and catalyst?
Pre-catalyst is a catalytic converter that is fitted to Diesel engines to control emissions soon after engine start up when the main catalytic converter is not yet up to operational temperatures. In Europe a pre-catalyst is commonly used where a Diesel Particulate filter is fitted for stage 4 and 5 emissions requirements. The DPF is placed upstream from the main catalyst and in turn prevents the main catalyst heating up quickly enough to control the very initial emissions.
What effects will a faulty o2 sensor have on a vehicles performanc?
I have an 02 Altima and if your getting a warning light saying the O2 sensor is bad, take it to a mechanic. Check to see if the engine is burning oil and check if the catalytic converter is clogged. Also check to make sure your car has received all of it recalls. One recall identifies that there is a defective hanger pin in the precatalyst which has been known to break and cause microscopic damage to the engine (due to its abnormal close proximity to the engine). Over time this damage leads to the engine burning oil which eventually leads to clogging of the catalyst which leads to overheating of the converter which leads to burning / melting of the o2 sensor. Solution: Possibly just a new sensor, possibly a new catalytic converter, possibly a new engine. I hope your problems don't go down that road; mine did right around 100k miles. Good luck. -Never buying a Nissan again. I have an 02 Altima and if your getting a warning light saying the O2 sensor is bad, take it to a mechanic. Check to see if the engine is burning oil and check if the catalytic converter is clogged. Also check to make sure your car has received all of it recalls. One recall identifies that there is a defective hanger pin in the precatalyst which has been known to break and cause microscopic damage to the engine (due to its abnormal close proximity to the engine). Over time this damage leads to the engine burning oil which eventually leads to clogging of the catalyst which leads to overheating of the converter which leads to burning / melting of the o2 sensor. Solution: Possibly just a new sensor, possibly a new catalytic converter, possibly a new engine. I hope your problems don't go down that road; mine did right around 100k miles. Good luck. -Never buying a Nissan again.
