Question

What are catalytic promoters and catalytic position ?

Answer 1

catalytic promoters -Substances which themselves are not catalysts, but when mixed in small quantities with the catalysts increase their efficiency are called as promoters or activators.

(i) For example, in Haber’s process for the synthesis of ammonia, traces of molybdenum increases the activity of finely divided iron which acts as a catalyst.

(ii) In the manufacture of methyl alcohol from water gas, chromic oxide  is used as a promoter with the catalyst zinc oxide .

Catalytic poisons : Substances which destroy the activity of the catalyst by their presence are known as catalytic poisons.

(i) For example, the presence of traces of arsenious oxide  in the reacting gases reduces the activity of platinized asbestos which is used as catalyst in contact process for the manufacture of sulphuric acid.

(ii) The activity of iron catalyst is destroyed by the presence of  or  in the synthesis of ammonia by Haber’s process.

(iii) The platinum catalyst used in the oxidation of hydrogen is poisoned by .

Answer 2

Answer:

${\huge{\underline{\underline{\pmb{\mathcal{\color{navy}{A}}{\sf{\color{pink}{nswe}}{\mathcal{\color{purple}{R} \pink{:}}}}}}}}}$

Catalytic promoters -

Substances which themselves are not catalysts, but when mixed in small quantities with the catalysts increase their efficiency are called as promoters or activators.

• ๛ (i) For example, in Haber’s process for the synthesis of ammonia, traces of molybdenum increases the activity of finely divided iron which acts as a catalyst.
• ๛ (ii) In the manufacture of methyl alcohol from water gas, chromic oxide  is used as a promoter with the catalyst zinc oxide .

Catalytic poisons -

Substances which destroy the activity of the catalyst by their presence are known as catalytic poisons.

• ๛ (i) For example, the presence of traces of arsenious oxide  in the reacting gases reduces the activity of platinized asbestos which is used as catalyst in contact process for the manufacture of sulphuric acid.
• ๛ (ii) The activity of iron catalyst is destroyed by the presence of  or  in the synthesis of ammonia by Haber’s process.
• ๛ (iii) The platinum catalyst used in the oxidation of hydrogen is poisoned by .