# 9.36  What do you understand by the terms: (i) hydrogen economy (ii) hydrogenation (iii) ‘syngas’ (iv) water-gas shift reaction (v) fuel-cell ?

R Rakesh

(i)Hydrogen Economy- Technique of using dihydrogen in an efficient way. The basic principle of the hydrogen economy is the transportation and storage of energy in the form of liquid or gaseous dihydrogen.

(ii)Hydrogenation- The addition of dihydrogen to the reactant. This process can be done with the help of a suitable catalyst like nickel and palladium.

(iii)Syngas-  The mixture of $CO\&H_{2}$ . This mixture of carbon monoxide and dihydrogen is used for the synthesis of methanol and a number of hydrocarbons, its called syngas, water gas or synthesis gas.

(iv)Water gas shift reaction- To increase the production of dihydrogen, by reacting with carbon monoxide of syngas mixture with steam in the presence of iron chromate as a catalyst. $CO(g)+H_{2}O(g)\rightarrow H_{2}+CO_{2}$ This is called water gas shift reaction.

(v)Fuel-cell- These are the devices that produce electrical energy from the liquid fuel with the help of suitable electrolytes.dihdrogen can be used in these cells to produce electrical energy. It is eco-friendly in nature.

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