Purpose of catalytic reforming: Which reaction best represents the principal desired transformation in catalytic reforming for octane improvement of naphtha?

Introduction / Context: Catalytic reforming is a key octane-boosting process that converts low-octane naphtha into high-octane reformate while generating hydrogen. The core chemistry targets molecular restructuring that elevates antiknock quality.

Given Data / Assumptions:

• Pt-based bifunctional catalysts (metal + acid sites).
• Feed rich in naphthenes and normal paraffins.
• Objective: increase aromatics and isoparaffins content.

Concept / Approach: The signature reaction is the dehydrogenation of naphthenes to aromatics (e.g., cyclohexane → benzene + H2). Aromatics and branched isoparaffins have higher octane numbers. Other listed reactions either consume hydrogen or decrease octane/liquid yield and are not the central reforming objective.

Step-by-Step Solution:

Verification / Alternative check: Standard reforming schematics show naphthene → aromatic + hydrogen as a headline pathway, providing both octane uplift and valuable H2 for hydrotreating.

Why Other Options Are Wrong:

Common Pitfalls: Confusing catalytic reforming with hydrocracking or hydrotreating; each has distinct goals and chemistry.

Final Answer: dehydrogenation of naphthenes