Activity and Selectivity of Solid Catalysts — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

Based on trend analysis, current affairs, and recurring themes in Activity and Selectivity of Solid Catalysts.

Application of Sabatier Principle

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The Sabatier principle is a fundamental concept explaining catalyst activity. NEET often tests fundamental principles. A question could involve a scenario where adsorption is too strong or too weak, asking about the consequence on activity, or directly asking for the definition of optimal adsorption. This concept is crucial for understanding why certain metals are better catalysts than others for specific reactions.

Identification of Shape-Selective Catalysts and their Mechanism

high

Shape selectivity, especially involving zeolites like ZSM-5, is a distinct and easily testable concept. Questions frequently ask to identify such catalysts or explain how their pore structure dictates product formation. Given its clear industrial relevance and unique mechanism, it's a favorite for conceptual questions.

Distinguishing Activity vs. Selectivity with Examples

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Students often confuse these two terms. A question might present a reaction and ask whether it demonstrates activity or selectivity, or ask for factors that influence one versus the other. Using examples like synthesis gas conversion (selectivity) or Haber process (activity) to illustrate the difference is a common approach in exams.

Role of Promoters and Poisons

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While not directly activity or selectivity, promoters and poisons directly impact these properties. A question could ask about the function of a promoter (e.g., Mo in Haber) or how a catalyst can be poisoned (e.g., CO poisoning). This tests the broader understanding of catalyst modification.