The quality inspection of catalysts is a crucial step in ensuring the efficient and stable operation of industrial catalytic processes. The entire quality inspection system mainly covers five core indicator dimensions: chemical composition, physical structure, catalytic performance, mechanical properties, and stability. These dimensions comprehensively assess the quality and compatibility of the catalysts.
In terms of chemical composition inspection, the main focus is on verifying the content and purity of the main active components and carrier components of the catalyst, strictly controlling the content limits of various harmful impurities, and also testing parameters such as free water and loss on ignition. This ensures that the chemical system of the catalyst is pure and the ratio is compliant, thereby preventing abnormal activity caused by component imbalance from the very beginning.
The physical structure indicators are the key foundation for catalytic efficiency. The core detection parameters include specific surface area, pore volume, pore size distribution, packing density,particle size, and crystal phase structure. A regular and satisfactory physical structure can provide sufficient space and conditions for reactant adsorption and mass transfer reactions, ensuring the smooth progress of catalytic reactions.
Catalytic performance is the core indicator for catalyst quality inspection, focusing on evaluating the conversion rate of reactants, the selectivity of target products, the temperature range of activity, the adaptability to space velocity, and the anti-poisoning ability. It directly measures the catalytic efficiency and reaction compatibility of the catalyst, determining its actual performance in industrial applications.
Mechanical performance indicators concern the industrial service life of the catalyst. The main detection parameters include compressive strength, wear rate, axial and radial structural strength, ensuring that the catalyst is less likely to be damaged, pulverized, or collapsed during loading and operation, and suitable for various fixed-bed and fluidized-bed industrial operation scenarios.
Stability performance focuses on the long-term usage ability of the catalyst, including thermal stability, hydrothermal stability, long-term operation attenuation performance, and regeneration performance. It is used to evaluate the retention ability of activity and reusability of the catalyst under complex conditions such as high temperature, water vapor, and long-term continuous operation, ensuring the continuity and economy of industrial production. The simultaneous achievement of all indicators can meet the quality standards for industrial application of the catalyst.