Characteristics and Applicable Waste Gas Types of Platinum-Based Catalysts
A brief overview of the characteristics of platinum-based catalysts and the types of waste gases they are suitable for.
Characteristics and Applicable Waste Gas Types of Platinum-Based Catalysts
Pt-based catalysts are known for their broad-spectrum oxidation activity and thermal stability, making them the mainstream choice for VOCs catalytic purification.
Basic Characteristics
Characteristics | Specifications |
Ignition Temperature | 200-350℃ |
Operating Temperature | 250-450℃ |
Thermal Stability | Stable at ≤550℃ |
Poisoning Resistance | Sensitive to S, Cl, and Si |
Broad-spectrum Oxidant | Highly reactive to alkanes, aromatics, and CO |
Applicable and unapplicable exhaust gases
Waste Gas Type | Typical VOCs | Applicability |
Alkanes | n-Hexane, Cyclohexane | Preferred |
Aromatics | Benzene, Toluene, Xylene | Preferred |
CO | CO | Preferred |
Oxygen-containing VOCs | Alcohols, Esters, Ketones | Applicable |
Sulfur-containing VOCs | Thiols, Thiophene | Not Applicable (S Poisoning) |
Chlorine-containing VOCs | Chlorobenzene, Dichloromethane | Not Applicable (Cl Poisoning) |
Silicon-containing VOCs | Siloxanes | Not Applicable (SiO₂ Coverage) |
Selection Recommendations
Operating Conditions | Recommended |
Clean exhaust gas containing benzene compounds and alkanes | Pt-based catalyst |
CO exhaust gas | Pt-based catalyst |
Methane exhaust gas | Pd-based catalyst |
Sulfur/chlorine-containing VOCs | Pt not selected, metal oxides used instead |
Mixed VOCs | Pt-Pd bimetallic catalyst (synergistic effect) |
Summary
The core characteristics of Pt-based catalysts can be summarized as: broad-spectrum oxidation strength and good thermal stability, but they are sensitive to S/Cl/Si poisoning. They are suitable for clean waste gases containing benzene compounds, alkanes, and CO; however, they are not suitable for applications containing sulfur, chlorine, or silicon. For mixed VOCs or when a lower ignition temperature is desired, Pt-Pd bimetallic catalysts are a better choice. Before selecting a catalyst, it is essential to confirm whether the waste gas contains toxic substances; otherwise, the high activity of Pt will be difficult to utilize.