Environmental and Energy Technologies

An important application of Pt along with other PGM's (palladium, rhodium) is the catalytic reduction of exhaust emissions, i.e. carbon monoxide CO, hydrocarbons HC, and partly nitrogen oxides NOx. Here is use of mainly cylindrical converters based on ceramic cordierite (honeycombs) or on steel foil wound and soldered (metal type).

Moreover, Pt catalysts serve to remove impurities from gases (e.g. carbon monoxide, CO, from hydrogen).

Heraeus’ Pt chemicals for coating are e.g.:

• Dihydrogen hexachloroplatinate(IV) hydrate, H2[PtCl6]•nH2O („CPA“)

• Platinum(II) nitrate, Pt(NO3)2

• cis-Diamminedinitritoplatinum(II) solution, cis-[Pt(NO2)2(NH3)2]

• Tetraammineplatinum(II) chloride hydrate, [Pt(NH3)4]Cl2•nH2O

• Tetraammineplatinum(II) hydrogencarbonate, [Pt(NH3)4](HCO3)2

• Tetraammineplatinum(II) hydroxide solution, [Pt(NH3)4](OH)2

• Tetraammineplatinum(II) nitrate solution, [Pt(NH3)4](NO3)2

• Platinum sulfite solution

• 2-Hydroxyethylammonium hexahydroxoplatinate(IV) solution „Pt EA“

Pd is applied to the purification of gases, too (e.g. to remove oxygen).

Heraeus offers you for the coating with palladium e.g.:

• Diamminedinitritopalladium(II) solution, [Pd(NO2)2(NH3)2]

• Tetraamminepalladium(II) chloride hydrate, [Pd(NH3)4]Cl2•nH2O

• Tetraamminepalladium(II) hydrogencarbonate, [Pd(NH3)4](HCO3)2

• Tetraamminepalladium(II) nitrate solution, [Pd(NH3)4](NO3)2

• Dihydrogen tetrachloropalladate(II) solution, H2[PdCl4]

• Palladium(II) nitrate solution, Pd(NO3)2

• Sodium tetrachloropalladate(II), Na2[PdCl4]

• Potassium tetrachloropalladate(II), K2[PdCl4]

• Palladium(II) acetate, Pd(OAc)2

• Tetraamminepalladium(II) hydroxide solution, [Pd(NH3)4](OH)2

Is used as a co-metal to Pt or Pd in catalytic converters.

Heraeus supplies you with rhodium chemicals for coating supports, e.g.:

• Rhodium(III) chloride, RhCl3•nH2O

• Rhodium(III) nitrate solution, Rh(NO3)3

• Rhodium sulfite solution

A specific application of Ir catalysts is the decomposition of hydrazine (N2H4) into the gaseous elements nitrogen and hydrogen to control satellites.

Heraeus supplies you for Ir coating with e.g.:

• Dihydrogen hexachloroiridate(IV) hydrate, H2[IrCl6]•nH2O

• Iridium(IV) chloride hydrate, IrCl4•nH2O

• Iridium acetate

mainly serves as a co-catalyst in that field.

The preferable Au compounds for coating is:

• Hydrogen tetrachloroaurate(III) hydrate, H[AuCl4]•nH2O