How to evaluate catalysts for treating organic waste gases

Honeycomb ceramic catalysts for enameling machines: These are used for treating industrial organic waste gases that contain carbon monoxide, hydrocarbons, and their oxygen-containing derivatives. Their key feature is that they use honeycomb ceramics as a substrate, with γ-Al2O3 serving as a secondary carrier; precious metals such as platinum and palladium are then coated on this structure. Such catalysts exhibit low gas flow resistance, a low reaction onset temperature, high activity, and a wide range of acceptable space velocities. When the concentration of hydrocarbon compounds is between 2000–8000 mg/m3, with a space velocity of 10,000–30,000 h^-1 and an inlet temperature of 180–300°C, the purification efficiency is ≥98%. They can withstand temperatures up to 900°C, and their service life is at least 7,500 hours. Their applications include industries such as food processing, machinery manufacturing, chemicals, instrumentation, and paint spraying

To evaluate a catalyst, one should consider: 1. the catalyst’s activation temperature, space velocity, conversion efficiency, high-temperature resistance, poisoning resistance, and service life. 2. Carrier strength (metal ※ ceramic), coating technology, selection of precious metals, distribution of precious metals.

1. Catalytic efficiency, which is characterized by measuring the changes in the concentration of organic waste gases entering and leaving the catalytic system. 2. Lifetime, which refers to how the catalytic efficiency changes over time. 3. Strength; the composition and structure of the catalyst can be determined using XRD, among other methods. These were the aspects that were studied in previous research on catalysts for automobile exhausts, n years ago