Question

Write reactions for the preparation of hydrogen from

1. The action of a reducing agent on an acid.
2. Bosch process (including the reactions for separation).

Answer 1

1. $$\begin{gathered} \mathrm{Zn}\left(\mathrm{s}\right)+2\mathrm{HCl}\left(\mathrm{aq}\right)\stackrel{}{\to {\mathrm{ZnCl}}_2}\left(\mathrm{s}\right)+{\mathrm{H}}_2\left(\mathrm{s}\right) \\ \mathrm{Zinc}\mathrm{Hydrochloric}\mathrm{acid}\mathrm{Zinc}\mathrm{chloride}\mathrm{Hydrogen} \end{gathered}$$
2. Bosch process involves the following steps: Step 1: Water gas the mixture of CO and H₂ is prepared by passing superheated steam over red hot coke at 1000⁰C Ni as a catalyst. $$\begin{gathered} \mathrm{C}\left(\mathrm{s}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)\stackrel{}{\to \underbrace{\mathrm{CO}\left(\mathrm{g}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right)}} \\ \mathrm{Coke}\mathrm{Steam}\mathrm{Water}\mathrm{gas} \end{gathered}$$
3. Step 2:Water gas shift reaction. The reaction in which carbon monoxide of water gas reacts with steam to give carbon dioxide and more hydrogen is called water gas shift reaction. $$\begin{gathered} \underbrace{\mathrm{CO}\left(\mathrm{g}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right)}+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)\underset{{\mathrm{FeCrO}}_4}{\overset{{450}^0}{\to }}{\mathrm{CO}}_2\left(\mathrm{g}\right)+2{\mathrm{H}}_2\left(\mathrm{g}\right) \\ \mathrm{Water}\mathrm{gas}\mathrm{Steam}\mathrm{Carbon}\mathrm{dioxide}\mathrm{Hydrogen} \end{gathered}$$