Pd- nice $1005/ozt
Pd- nice $1005/ozt
"What Difference, at this time, does it make?"
"What is 'is'?"
"Because you'd be in jail"
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H. L. Mencken
"What Difference, at this time, does it make?"
"What is 'is'?"
"Because you'd be in jail"
Here is a good post:
Timothy I. Hyde
Johnson Matthey
Your question you ask may not be correct as modern catalysts are mostly bimetallics. Also In general we have to distinguish between diesel and gasoline engines.
The role of Pt in catalytic converters is to oxidise carbon monoxide (CO) and hydrocarbons. Pt is particularly effective at this under oxygen-excessive conditions, so is often the metal of choice for diesel applications. With development, modern Diesel oxidation catalysts are most often bimetallic Pt-Pd based.
For gasoline powered vehicles (where there is a balance between reductants and oxidants in the exhaust gas), Pt and Pd can be equally effective. The three-way catalyst used for gasoline powered vehicles must also be able to reduce NOx to nitrogen as well as oxidise CO and hydrocarbons – that is why Rh is generally used in addition to Pt or Pd.
Historically most gasoline engine catalyst formulations included Pt/Rh as the active component. While catalysts may be trimetallic (Pt/Pd/Rh), they are now mostly Pd/Rh in composition with this choice often made on the basis of relative cheaper cost of Pd over Pt.
I attach a couple of short articles from Platinum Metals Review which expand upon my answer.
162-pmr-jul07.pdf
409.47 KB
27-34-pmr-jan09.pdf
1.12 MB
"What Difference, at this time, does it make?"
"What is 'is'?"
"Because you'd be in jail"
Another on the same thread:
3 years ago
Michael Paraskevas
IMMG SA
The bimetallic catalyst is an urban legend! The Pt is in lower ratio due to its cost, but it will always exist. A lot of papers talk about a ratio Pd/Pt/Rh of 5/1/1, but recent finds have gone as far as 9/1/1. Have a look at some papers:
Analytical letters 2012.pdf
1.65 MB
moldovan determinationfumes.pdf
130.62 KB
twigg.pdf
1.38 MB
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"What Difference, at this time, does it make?"
"What is 'is'?"
"Because you'd be in jail"
Platinum is suffering from the advanced condition of Bitcoinitis circa 2033.
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FAKE "ELECTIONS" - Why Ron Paul Can't "Win"
"If telling the truth marginalizes you, then that is the place to be. After all, if enough people are willing to be marginalized, then before you know it, society has developed a different center. This is the politics of truth." -- E. Martin Schotz
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