The elements in the middle section of the Periodic Table are the transition in the Haber process; Nickel is a catalyst used in the manufacture of margarine.
the widely used catalyst is V2O5 .
vanadium pentaoxide
In the production of ammonia, Iron is used as a catalyst
Well Platinum is an element so there is really only one type. However, platinum may be used as "sheet" or finely powdered if it was going to be used as a catalyst. Alternatively, it may be used to "plate" a less expensive metal to also act as a catalyst for example in a catalytic converter.
Aluminium is light and strong. It is used extensively in the manufacture of planes, space shuttles also in the building industry. It is more expensive than steel to manufacture so steel is still used extensively where weight is not a problem.
the widely used catalyst is V2O5 .
vanadium pentaoxide
Hydrogen
You are talking about hydrogenated oils I imagine. Hydro as in water. I'm weak on the details, but it is how water is used to cause oils to become solids so that margarine can be made. If you look at the ingredients, there is quite a lot of water in it.
yttrium
Magnesium
carbon
Silicon is used in computer chips.
chromium
Anything that is added to a chemical reaction that's intended to speed up the reaction - is a catalyst.
Chlorophyll is the catalyst that is used in the process of photosynthesis.
Yes, indirectly, but not as a separate element. Hydrogen is used in the Haber process to manufacture ammonia. This is then used directly as a fertilizer or used to create other ammonia based compounds e.g ammonium salts for use as fertilizer.