Activated carbon, as a catalyst, has become an efficient catalytic material in multiple fields due to its high specific surface area, well-developed pore structure, and adjustable surface chemical properties. It can not only be directly used as a catalyst to catalyze reactions such as oxidation and dehydrogenation through surface active sites (such as oxygen-containing functional groups), but also serve as a catalyst carrier to support metals (such as palladium, platinum) or metal oxides (such a
Case Details
Activated carbon is widely used in the field of catalysis due to its high specific surface area, adjustable surface active sites, and good carrier compatibility. Its core application scenarios focus on three major areas: industrial purification, energy conversion, and environmental governance. Specifically, it can be divided into the following 8 typical applications, which are elaborated in combination with actual industry needs:
- Industrial Waste Gas Treatment (the most core application scenario)
Catalytic combustion of VOCs
Scenario: Treatment of VOCs (benzene, toluene, xylene, acetone, etc.) in industries such as spray booths, printing, chemicals, and coating;
Function: Activated carbon, as a carrier supporting precious metals such as Pt and Pd or metal oxides such as MnO₂ and CeO₂, catalyzes the oxidation of VOCs to CO₂ and H₂O at 200-400℃, with a purification efficiency of over 95%. It is suitable for medium and low concentration waste gases and has lower energy consumption than direct combustion.
Catalytic decomposition of odorous gases
Scenario: Treatment of odorous gases such as hydrogen sulfide (H₂S), ammonia (NH₃), and mercaptans in landfills, sewage treatment plants, and farms;
Function: Modified activated carbon (impregnated with NaOH, KMnO₄, etc.) acts as a catalyst, converting H₂S into S or SO₄²⁻ and ammonia into N₂ through redox reactions, while adsorbing unreacted odor molecules.
- Catalytic purification of water treatment
Catalytic oxidation of refractory organic wastewater
Scenario: Treatment of wastewater containing refractory pollutants such as phenols, dyes, and antibiotics in industries such as chemicals, printing and dyeing, pharmaceuticals, and electroplating;
Function: Activated carbon loaded with Fe, Cu, TiO₂, etc., serves as a catalyst in Fenton reactions and photocatalytic reactions, activating H₂O₂ or light energy to generate hydroxyl radicals (・OH), efficiently decomposing organic pollutants, and reducing COD and chromaticity.
Advanced purification of drinking water
Scenario: Micro-pollution treatment in waterworks and water purifiers;
Function: Activated carbon loaded with antibacterial components such as silver (Ag) and zinc (Zn) has both catalytic sterilization (damaging bacterial cell membranes) and adsorption of residual chlorine and trace organic substances, improving water quality safety.
- Energy conversion field
Fuel cell catalyst carrier
Scenario: Proton exchange membrane fuel cells (automobiles, energy storage equipment);
Function: Activated carbon (or modified activated carbon, such as nitrogen-doped activated carbon) serves as a carrier to load precious metal nanoparticles such as Pt and Pd, improving the dispersion and electronic conductivity of the catalyst, and reducing the internal resistance and cost of fuel cells.
Catalytic conversion of biomass/coal
Scenario: Biomass gasification for hydrogen production, coal liquefaction for oil production;
Function: Activated carbon, as a catalyst or carrier, catalyzes the cracking and reforming reactions of biomass/coal, increasing the yield of hydrogen and syngas (CO+H₂), while reducing reaction temperature and energy consumption.
- Catalysis in organic synthesis reactions
Catalytic dehydrogenation/hydrogenation reactions
Scenario: Chemical synthesis (such as cyclohexane dehydrogenation to benzene, nitrobenzene hydrogenation to aniline);
Function: Activated carbon loaded with metals such as Ni and Pd acts as a catalyst for dehydrogenation/hydrogenation reactions, with the advantages of high selectivity and few side reactions, suitable for the production of fine chemical products.
Acid-base catalytic reactions
Scenario: Esterification, etherification, isomerization reactions (such as ethyl acetate synthesis, petroleum hydrocarbon isomerization);
Function: Activated carbon is endowed with acidic or alkaline active sites through modification (such as sulfonation, amination), directly serving as an acid-base catalyst to replace traditional liquid acids (such as sulfuric acid) and bases (such as sodium hydroxide), reducing equipment corrosion and environmental pollution.
- Other special scenarios
Automobile exhaust purification: Activated carbon loaded with rare earth metal oxides acts as an auxiliary catalyst in three-way catalytic converters, adsorbing and catalytically decomposing pollutants such as HC and CO in exhaust gas;
Soil remediation: Activated carbon loaded with microorganisms or chemical oxidants catalytically degrades petroleum hydrocarbons and heavy metal complexes in soil, accelerating the soil remediation process.
Core application characteristics
Strong adaptability: The surface active sites and pore structure can be adjusted through modification methods such as doping, impregnation, and calcination to meet different reaction needs;
Cost advantage: Compared with traditional metal oxide catalysts, activated carbon has a wide range of raw materials (coal, wood chips, coconut shells, etc.), low preparation cost, and can be recycled and regenerated;
Environmental friendliness: Most catalytic reactions are carried out at room temperature or medium-low temperature, with low energy consumption and no secondary pollution (for example, catalytic oxidation products are mostly harmless CO₂ and H₂O).
