Diagnosing system failures in catalysis involves a combination of analytical techniques and process monitoring. Techniques such as spectroscopy, chromatography, and electron microscopy can provide insights into the structural and chemical changes occurring in the catalyst. Process monitoring tools, including temperature, pressure, and flow sensors, help identify deviations from normal operating conditions that may indicate a failure. Additionally, computational methods such as molecular modeling and simulation can predict the behavior of catalytic systems under various conditions, aiding in the identification of potential failure points.