Patent US5110954 (http://l2.espacenet.com/dips/viewer?PN=US5110954&CY=gb&LG=en&DB=EPD)
- Dehydrogenation of diols.
Author Topic: copper chromite AKA Assholium catalyst
Torch
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A quick preparation question:
Can CuSO4*5H2O be used as a substitute for Cu(NO3)2*3H2O in the preparation of this catalyst?
(The use of CuSO4 would make this an OTC thing for me)
assholium
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Torch:
Sorry, no - it's impossible.
What's happen here:
copper nitrate + ammonium dichromate -> copper-ammonium-chromate + ammonium nitrate
if someone want to use copper sulphate, then obviously traces of ammonium sulphate must exists in deposited copper-ammonium-chromate, and under heating (remember - you must decompose chromate to chromite, hexavalent chromium to 3-valent) this shit can produce sulphyric acid, catalyst poison.
So... only nitrate acceptable, because heated ammonium nitrate cleanly decomposes to nitrogen suboxide, elemental nitrogen and water.
Torch
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Damnit damnit damnit!!
I read US Pat# 5,210,229 and thought it might work.
They prepared a Cu-Cr + Mn or Br & Na or K catalyst for gaseous phase dehydrogenation.
It sez' the catlips can be prepared as follows: copper nitrate, copper sulfate, copper chloride or copper acetate may be used as a copper source.
The Chromium soln is made basic by ammonium and admixed with the copper soln to form the prcpt. (I thought I could use their method up to this point prepare a Cr+Mn+Cr catlip)...It goes on..wash it, dry it & pyrolize it. Then wash with dil aq acid, water wash, dry and add the Na or K soln, dry it then calcinate, and finally reduce activate it with hydrogen reduction.
I couldn't just wash that kitten real good before I harvest the lips?
assholium
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>It sez' the catlips can be prepared as >follows: copper nitrate, copper sulfate, >copper chloride or copper acetate may be >used as a copper source.
Hm. According to my experience, Cu-Cr catalyst sensitive to halogens and strong acids, only 20 ppm of chlorine in hydrogenated substrate - and it's enough for catalyst death...
>I couldn't just wash that kitten real good >before I harvest the lips?
Of course, you can. But there is some risk to obtain shit instead of candy. This risk can be minimized by washing with diluted barium or calcium nitrate soln, for conversion of traces of ammonium sulphate to the thermally stable and inactive calcium or barium sulphate...
Torch
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Okay so I can make Cu(NO3)2 with nitric and copper..it's worth the extra work if it means the difference between shit and candy.
Just to make sure I'm on the right page here, it wouldn't hurt to add a pinch of Mn(NO3)2 if available or is it better to stick to the straight Cu-Cr?
Also if I have fumed silica would this be beneficial or is this just good for spray drying?
Finally I imagine stirring during the pyrolysis helps eliminate the gases and gives a nice powder. I have a standard 110V glasscloth heating mantle, if this doesn't get me up to temperature can I use a shallow crucible and kiln dry it w/o stirring or do I hafta' bust out a pot of molten lead?
Torch
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I don't get it... This seems like the purrfect catlips to transform sec alcs into ketones and primary alcs into aldehydes.
I can think of tons of uses..hasn't anyone else tried this cat befor?
grignard->alcohol->ketone->amine
This catalyst sounds like it is worthy of much more discussion and not just for 1,4B
Any more info on this catalyst and preperation!
One horny Bee!
http://www.water-cooler.com/WC/patentviewer/patent-4252689.html (http://www.water-cooler.com/WC/patentviewer/patent-4252689.html)
http://rhodium.lycaeum.org/chemistry/copperchromite.txt (http://rhodium.lycaeum.org/chemistry/copperchromite.txt)
http://rhodium.lycaeum.org (http://rhodium.lycaeum.org)
http://rhodium.lycaeum.org (http://rhodium.lycaeum.org)
http://rhodium.lycaeum.org (http://rhodium.lycaeum.org)
http://rhodium.lycaeum.org (http://rhodium.lycaeum.org)