01-06-02 12:36
No 253288
Science 3may74 pages563-565
"electronic structure and catalytic behavior of tungsten carbide
ABSTRACT. Tungsten carbide has been show to be an effective catalyst for a number of reactions readily catalyzed by platinum ......near the Fermi state, the electronic desity of tungsten carbide more nearly resembles that of platinum than that of tungsten"
Offered as a potential new OTC catalyst only. No hands on expereince just a ref.
just glad to bee here-----he he he
(Hive Bee)
02-09-02 18:09
No 267583
hey sometimes just too much info- too many tangents. I just thought this was something look into - definently OTC and with pretty good reviews. Oh well.
OTEECEE & meeeee!!!!
(Hive Prodigy)
02-09-02 20:12
No 267616
Oh, I have definitely filed this one away. I just had nothing to add, so I didn't comment. Great find.
Is the Fermi State dependent upon temperature?
PrimoPyro
Vivent Longtemps la Ruche!
(Hive Bee)
02-13-02 14:54
No 269313
Primo- reluctantly I do not know what a "fermi state" is. Sounds very physical though.
BTW this came from my curiosity about a statement in Merck - just something there stated that platinum or tungsten could be either used as a catalyst in (?) process/reaction.
Seems tungsten (being more available) details were worth seeking.
Also seems tungstate salts were the desired embodiment- I foget (often)............
OTEECEE & meeeee!!!!
(Hive Bee)
04-07-02 21:27
No 294030
The fermi temperature , i believe, is the temp at which the conductivity of the metal in its liquid state peaks. Has something to do with polarity and ions maybe ???
Found this - - "We could further speculate on the electrochemical nature of this material. Consider the hydrogenated semiconductor BiH2I. With two tetrahedral holes per site, BiI may be a strong hydrogen absorber, if its tendency to oxidize to BiIO is overcome. The material may exhibit ionic conduction of hydrogen ions, in contrast to electronic conduction of Bipolarons, depending on the electrode material. The end result would be the electrolysis of water, or reversibly, the catalysis of hydrogen and oxygen. Isolation of this material from the environment may be one prerequisite for this behavior; i.e. - Platinum, Tungsten, Carbon or Quartz."
Don't completely understand what that means so if anybody in here does than could a tungsten salt work in place of the Adam's catalyst in the hydrogenation of MDP2P via methylamine and possibly nitromethane?
Also found this definition " WORK FUNCTION. -- The minimum energy required to remove an electron from the Fermi level of a material into field-free space. Work function is normally expressed in electron volts. " don't seem like that helps to much though. A fermi is also a measurement of length. Also known as a femtometer (1^-15). Enrico Fermi was a physicist who did some shit with radioactivity (first controlled nuclear reaction I think)
It also seems to deal with solid state lasers, super-conductors, surfaces, and compressed liquids.
_.-==''SupaTokaBuDsMoka''==-._
'''''''GonnaGetHighTillIDie'''''''
(Hive Bee)
04-07-02 22:07
No 294051
Since were talking about catalysts can the following other catalysts be used instead of the Adam's Catalyst in hydrogenations of MDP2P. I found many things that said you could use Pt, Pd Ni, Rh to change Alkynes and alkanes to alkenes in hydrogenations. And since this next lab write up [url=http://orgchem.colorado.edu/courses
_.-==''SupaTokaBuDsMoka''==-._
'''''''GonnaGetHighTillIDie'''''''