Chemistry

Catalysis

Catalysis


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Examples

Heterogeneous catalysts usually catalyze reactions less selectively than homogeneous ones.

Tab. 1
Implementation of water gas (H.2/ CO mixture) at different contacts
catalystproduct
pure ZnOMethanol
ZnO with a lot of Cr2O3C.1... C4-Alcohols
ZnO with little alkali oxideC.1... C4-Alcohols
ZnO and Fe2O3Methane and higher hydrocarbons
Fe, Ni, Co (10 ... 20 bar)Petrol
Niacetic acid

Characteristic classes of substances are used as catalysts for certain types of reactions:

Tab. 2
Catalysts for some types of reactions
reactionCatalysts
OxidationsV, V2O5, Cu, Ag, Fe2O3, MnO2, Ag2O, CuO
Hydrogenations / dehydrogenationsPt, Pd, Fe, Co, Ni, Cu, oxides of Zn, Cr, Mo, W
Hydrations / dehydrationsAl2O3, SiO2, TiO2, BeO, aluminosilicates, phosphates
IsomerizationsCu, Ni, hydroxides of Al, Mo, Mg, Ca, Ba
HalogenationsHalides of Fe, Cu, Al, P