Positive Catalyst

A catalyst is any substance (or material), when it is added in the reaction then due to their presence in the reaction, the speed of the reaction is altered. And this reaction in which a catalyst is present, is called as "Catalytic Reaction". This phenomena is called "Catalysis". Thus, these substances can increase or decrease the rate of chemical reaction and positive catalyst is a type of catalyst which increases the rate of chemical reaction.

Positive Catalysts
the catalyst that reduces the activation energy by providing lower path and increases the rate of a reaction is known as "Positive Catalyst" and this phenomenon is known as "Positive Catalysis". Remember that if we reduced the activation energy then the path through which a reactant is converted into product, also decreases. 
Let's have a look some examples related to positive catalysts;
➤Haber process in which iron oxide used as a positive catalyst for the production of Ammonia (mostly used method) 
        N₂+ 3H₂(Fe₂O₃ as catalyst) ➝ 2NH₃
➤Manganese oxide as a positive catalyst in the production of oxygen from potassium oxide,
      2KClO₃ (MnO₂) ➝ 2KCl + 3O₂
➤Platinum as a positive catalyst in the production of sulfur trioxide;
    2SO₂ + O₂ (Pt as catalyst) ➝ 2SO₃


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