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Preparation Process: The Stock catalyst, a bismuth-molybdenum complex, is prepared as follows: 1. **Dissolution**: Dissolve bismuth nitrate (Bi(NO₃)₃·5H₂O) and ammonium molybdate ((NH₄)₆Mo₇O₂₄·4H₂O) in dilute nitric acid (HNO₃) under stirring. 2. **Precipitation**: Adjust the pH to 5–6 using ammonia (NH₄OH) to form a yellow precipitate of bismuth molybdate (Bi₂(MoO₄)₃). 3. **Filtration & Washing**: Filter the precipitate, wash with distilled water, and dry at 100–120°C. 4. **Calcination**: Heat the dried powder at 450–550°C for 4–6 hours to activate the catalyst. 5. **Pelletization**: Crush and pelletize the calcined material for use in oxidation reactions.
Usage Scenarios: The **Stock catalyst** is primarily used in chemical and industrial processes to accelerate reactions without being consumed. It enhances efficiency in petroleum refining, polymer production, and pharmaceutical synthesis by lowering activation energy. In hydrogenation and oxidation reactions, it improves yield and selectivity. Stock catalysts also play a key role in environmental applications, such as reducing emissions in automotive catalytic converters. Their stability and reusability make them cost-effective for large-scale manufacturing. Additionally, they aid in fuel cell technology and renewable energy processes, optimizing performance. Their versatility supports advancements in agrochemicals, specialty chemicals, and material science.