Unreproducible results can stem from multiple sources. Common causes include:
1. Catalyst Preparation: Variability in catalyst synthesis can lead to differences in activity and selectivity. Small changes in preparation methods, such as temperature, pressure, or precursor materials, can significantly impact the final catalyst.
2. Experimental Conditions: Factors such as temperature, pressure, and reactant concentration must be precisely controlled. Even minor deviations can result in different outcomes.
3. Characterization Techniques: Errors in catalyst characterization can lead to incorrect conclusions about the catalyst's properties and performance.
4. Human Error: Inconsistent experimental procedures or subjective interpretations of data can also contribute to unreproducible results.
