Cat Question?
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Freshman User
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From: oklahoma
Cat Question?
I was just thinking about how a cat works, both on a gas and a diesel. I know the exhaust flows over the ceramic looking material, and through a chemical reaction the quality of the exhaust is improved. I was just wondering, once the material in the cat on our diesels are coated and covered with greasy exhaust soot, does this chemical reaction still happen? It is really doing any good? Anybody have any thoughts? Maybe I think to much!
Last edited by bob6.0; Jun 18, 2004 at 12:08 AM.
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From: stoneboro, pa
Originally Posted by Tim Lamkin
The cat on the 6.0 works very well,
IMO needed also........o-boy here it comes
IMO needed also........o-boy here it comes
3 different DCNR guys w/ books on it couldnt tell me. they just laughed and said "cuz it is".
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Originally Posted by bighoss550
a cat's purpose is to reduce NOx. a diesel doesnt produce NOx.tell me why they put it on there?
3 different DCNR guys w/ books on it couldnt tell me. they just laughed and said "cuz it is".
3 different DCNR guys w/ books on it couldnt tell me. they just laughed and said "cuz it is".
The only real difference between gasoline and diesel fuel is the length of the hydrocarbon chain. Neither of them contains appreciable amounts of nitrogen. However, air is 70% nitrogen. Both use air as a source of oxygen. Nitrogen + oxygen + heat = NOx.
So how does the combustion of diesel fuel in a diesel engine not produce NOx?
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The material inside the cat is ceramic (like in most portable heaters). Ceramic holds heat like a brick oven, this causes the unburned gases to continue to burn as they pass over the hot ceramic. end result gases are complety burnt when they exit your exaust pipe. I dont think there is actually any chemical reactions taking place. Sombody please correct me if I'm wrong. I'm not very good at explaining things.
Jerry
Jerry
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Originally Posted by $trokin60
The material inside the cat is ceramic (like in most portable heaters). Ceramic holds heat like a brick oven, this causes the unburned gases to continue to burn as they pass over the hot ceramic. end result gases are complety burnt when they exit your exaust pipe. I dont think there is actually any chemical reactions taking place. Sombody please correct me if I'm wrong. I'm not very good at explaining things.
Jerry
Jerry
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Originally Posted by bighoss550
a cat's purpose is to reduce NOx. a diesel doesnt produce NOx.tell me why they put it on there?
3 different DCNR guys w/ books on it couldnt tell me. they just laughed and said "cuz it is".
3 different DCNR guys w/ books on it couldnt tell me. they just laughed and said "cuz it is".
"The EPA estimates that diesel engines generated about 27% of the manmade NOx emissions in 1996"
So much for, "...a diesel doesnt produce NOx".
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From: stoneboro, pa
Originally Posted by rstephenw
Here's a quote from Chevron's diesel information site (http://www.chevron.com/prodserv/fuels/bulletin/diesel/L2_3_fs.htm).
"The EPA estimates that diesel engines generated about 27% of the manmade NOx emissions in 1996"
So much for, "...a diesel doesnt produce NOx".
"The EPA estimates that diesel engines generated about 27% of the manmade NOx emissions in 1996"
So much for, "...a diesel doesnt produce NOx".
and why are diesels all exempt from emmissions tests, if they are so pollutant??
and the catylist is platinum.
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The older ones used to be platinuim BB's. They did away with that several years ago. now they are made of ceramic honeycomb. I'm not sure if they are coated with something or not. I guess this gives me a research project to do. I will keep you all informed as to what I find out.
Jerry
Jerry
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Most "modern" catalytic converters have two catalyst sections. One is the reduction catalyst, which uses platinum and rhodium to reduce NOx to gaseous Nitrogen and Oxygen.
There is also an oxidation catalyst, consisting of platinum and palladium, which converts carbon monoxide to carbon dioxide.
A simple explaination can be found at http://auto.howstuffworks.com/catalytic-converter2.htm.
There is also an oxidation catalyst, consisting of platinum and palladium, which converts carbon monoxide to carbon dioxide.
A simple explaination can be found at http://auto.howstuffworks.com/catalytic-converter2.htm.
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From: stoneboro, pa
Originally Posted by $trokin60
The older ones used to be platinuim BB's. They did away with that several years ago. now they are made of ceramic honeycomb. I'm not sure if they are coated with something or not. I guess this gives me a research project to do. I will keep you all informed as to what I find out.
Jerry
Jerry
ive seen the honeycomb a few times, it chunks apart real nice!!!!
they also have some sort of insulation stuff lining the can. see if they tell u about this cuz it has shiney metal flakes in it. always pondered this subject
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From: Campbell, California
The "cat" on the 6.0L PSD is a particulate matter filter. It's job is to break down soot and unburned fuel. All the stuff that causes those bellowing clouds of black smoke that diesels are known for. NOx reduction is the job of the EGR system.
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Originally Posted by hitecdan
The "cat" on the 6.0L PSD is a particulate matter filter. It's job is to break down soot and unburned fuel. All the stuff that causes those bellowing clouds of black smoke that diesels are known for. NOx reduction is the job of the EGR system.