Poor product quality can occur due to several reasons:
1. Catalyst Deactivation: Over time, catalysts can lose their activity due to poisoning, fouling, sintering, or coking. 2. Reaction Conditions: Inadequate temperature, pressure, or pH levels can lead to incomplete reactions or formation of by-products. 3. Contamination: Impurities in reactants or the catalyst itself can negatively affect the reaction. 4. Mass Transfer Limitations: Inefficient mixing can cause uneven distribution of reactants, leading to hot spots or cold spots in the reactor. 5. Kinetic Issues: Incorrect choice of catalyst can result in unfavorable reaction pathways.
