Platinum on carbon

Platinum on carbon, often referred to as Pt/C, is a form of platinum used as a catalyst.[1] The metal is supported on activated carbon in order to maximize its surface area and activity.

Platinum on carbon
Names
Other names
Pt/C, Pt-C
Identifiers
3D model (JSmol)
EC Number
  • 231-116-1
UNII
Properties
Pt
Appearance Black powder
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Uses

Catalytic hydrogenation

Platinum on carbon is used for catalytic hydrogenations in organic synthesis. Examples include carbonyl reduction, nitro compound reduction, secondary amine production via nitrile reduction, and the production of saturated heterocycles from their respective aromatic compound precursors.[1]

Preparation

An aqueous solution of activated carbon and chloroplatinic acid is heated on a water bath for a few hours at 50°C,[1][2] and after cooling, the solution is then made alkaline using sodium carbonate. The chloroplatinic acid is then reduced with hydrazine hydrate; however, this step is sometimes omitted in other preparations.[3] After additional 2 hours of warming, the solution is filtered, washed with distilled water, and dried over calcium chloride to yield the catalyst. Platinum loading is typically between 5% and 10%.

gollark: If you want to move off Facebook you'll probably worry about losing contact with 293848 people you don't have anywhere else, if you want to move off Skype you might just have something like 5 people in a group with you.
gollark: It mostly doesn't happen unless the existing stuff is also very bad. I suspect it's also easier for somewhat purpose-specific instant messaging than for general social network stuff because the group which has to move with you is smaller and you don't have to migrate giant friend lists or something.
gollark: Even if better services *do* exist, people generally don't move to something they don't have stuff/people they know on.
gollark: Generally it requires the existing service to be really bad before people start moving.
gollark: Yes, privacy-focused stuff often lacks features. But even if someone came up with "Facebook but significantly better somehow", network effects mean adoption would be very slow.

See also

References
  1. Nishimura, Shigeo (2001). Handbook of Heterogeneous Catalytic Hydrogenation for Organic Synthesis (1st ed.). Newyork: Wiley-Interscience. pp. 43–44, 271, 336, 499. ISBN 9780471396987.
  2. Kaffer, H. (1924). "Die Anwendung der Dehydrogenisations-Katalyse nach Zelinsky zum Nachweis von Dekalinen im Urteer". Berichte der deutschen chemischen Gesellschaft (A and B Series). 57 (8): 1261–1265. doi:10.1002/cber.19240570807.
  3. Newhall, William F. (1958). "Derivatives of (+)-Limonene. I. Esters of trans-p-Menthane-1,2-diol". The Journal of Organic Chemistry. 23 (9): 1274–1276. doi:10.1021/jo01103a009.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.