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Working principle and application of VOC: Volatile Organic Compounds(shared by Shandong Xiaoyuan Environmental Protection Technology Co., Ltd, website:
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I. Concept of VOCs VOCs (Volatile Organic Compounds) • Environmental Impacts: • Atmospheric photochemical reactions generate ozone and secondary particulate matter • Nerve damage, long-term exposure can cause cancer ⸻ II. Working Principle of VOC Ceramic Catalysts 1. Oxidation and decomposition of VOC gases into harmless substances: • CO₂ (carbon dioxide) • H₂O (water) • Core reaction: Oxidation reaction (usually between 250–450°C) VOC + O₂ → CO₂ + H₂O 2. Catalyst Composition 1. Support Material • Commonly used ceramic honeycomb support (cordierite or alumina ceramic) • Characteristics: • High specific surface area (beneficial for catalyst dispersion) • High thermal stability • Corrosion resistance 2. Coating/Active Components • Noble metal catalysts: • Mainly platinum (Pt) and palladium (Pd) • Pt, Pd, or a Pt/Pd combination can be selected according to the type of VOC. • Non-precious metal catalysts: • Active oxides, such as MnO₂, Co₃O₄, CuO • Functions: • Provides oxidation active sites, accelerating VOC decomposition • Reduces reaction temperature, improving conversion efficiency 3. Working Mechanism
• Adsorption-Reaction-Desorption Mechanism: 1. VOC molecules are adsorbed on the catalyst surface. 2. Under the action of precious metals or active oxides, they undergo oxidation reactions with oxygen. 3. CO₂ and H₂O are desorbed from the catalyst surface. • Role of promoters/supports: • Ceramic provides high surface area and thermally stable structure. • Modifiable oxides (CeO₂, ZrO₂) can store oxygen, improving low-temperature oxidation capacity. ⸻III. Applications of VOC Ceramic Catalysts 1. Automobile exhaust treatment • 2. Industrial waste gas treatment • 3. 4. Chemical process exhaust gas • ⸻IV. VOC VOC conversion rate can reach over 90% High temperature resistance 600–800°C Low pressure drop honeycomb structure reduces exhaust gas drag and provides long lifespan. The noble metal catalyst is bonded to a stable support with a lifespan of 5–10 years. Customization is available, adjusting the Pt/Pd ratio or using non-noble metal formulations based on VOC type.
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How to change the catalytic converter(shared by Shandong Xiaoyuan Environmental Protection Technology Co., Ltd, website:
link hidden, please login to view） I. Preparations Before Replacement 1. Safety Tools and Equipment: • Jack and support frame • Socket wrench, open-end wrench, universal joint • Non-slip gloves, safety goggles • WD-40 or other lubricant (to prevent bolts from rusting) • New catalytic converter (model matching original) 2. Vehicle Preparation: • Park on a level surface • Engage the handbrake • Ensure the engine is completely cooled (catalytic converter temperature is very high, easily causing burns) • Disconnect the negative terminal of the battery to prevent accidental triggering of the oxygen sensor alarm 3. Spare Parts: • New catalytic converter • New gasket • If damaged, the oxygen sensor (O2 sensor) may need to be replaced. ⸻II. Replacement Steps 1. Locate the Catalytic Converter • The catalytic converter is usually located after the exhaust manifold and before the muffler. • In diesel vehicles, it may be before the DOC and DPF. • Note the oxygen sensors before and after the catalytic converter; they need to be removed during replacement. 2. Remove the Oxygen Sensor • Use an O2 sensor socket or open-end wrench to unscrew it counterclockwise. • Be careful not to damage the sensor wiring harness.
3. Loosen the catalytic converter mounting bolts.
• The catalytic converter is usually fixed to the exhaust pipe with flange bolts.
• Spray lubricant on rusted bolts and wait 5–10 minutes.
• Use a socket wrench to loosen slowly, do not use excessive force to avoid breakage.
4. Remove the old catalytic converter.
• Remove it gently, being careful not to damage the exhaust pipe and suspension bracket.
• Check if the flange sealing surface is flat; repair any corrosion or deformation.
5. Install the new catalytic converter.
1. Install the new gasket (ensure alignment).
2. Install the new catalytic converter, first hand-tightening the mounting bolts to ensure correct positioning.
3. Then use a wrench to tighten evenly, avoiding overtightening to prevent flange deformation.
6. Reinstall the oxygen sensor.
• Use an O2 sensor socket wrench to screw it back on with moderate torque.
• Be careful not to twist the sensor wiring harness or allow it to come into contact with high-temperature components.
7. Check.
• Confirm that the catalytic converter is securely fixed and the oxygen sensor connection is normal.
• There are no obvious gaps in the exhaust pipe.
• Reconnect the battery negative terminal. ⸻III. Precautions 1. Avoid high-temperature operation: The catalytic converter's temperature can reach 400–600°C immediately after engine shutdown. 2. Ensure model compatibility: Different vehicle models have different catalytic converter apertures, lengths, and oxygen sensor interfaces. 3. Environmental requirements: Removed catalytic converters contain precious metals and should be recycled according to local regulations. 4. Engine fault codes (MIL): • After replacement, P0420 or similar codes may appear, requiring clearing the fault codes or waiting for self-learning. 5. Do not forcefully strike: The ceramic inside the old catalytic converter is fragile; avoid allowing fragments to enter the exhaust pipe. 6. Torque requirements: • Flange bolts are generally recommended at 20–40 Nm (depending on the vehicle model). • Oxygen sensor torque is generally 30–40 Nm. ⸻
Tips: • If the catalytic converter is only partially blocked, you can try cleaning or high-temperature regeneration first, but severe blockage still requires replacement. • For diesel vehicles, note that the catalytic converter after the DPF (DOC) and the oxidation catalytic converter are usually replaced or inspected together to ensure regeneration efficiency.
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Shandong Xiaoyuan Environmental Protection Technology Co., Ltd(website: https://www.gaslyst.com). Specializing in Catalyst carrier, metal catalyst carrier, Three-Way Catalytic Converter, Three-Way Catalytic Converter Universal Package, Three-Way Catalytic Converter Ceramic Carrier, Automotive Ceramic Core Carrier,Truck Ceramic Inner Core Carrier, Metal Iron Core Inner Core Carrier, Automotive Emission Specific Products.
We are specializing in manufacturing honeycomb ceramic catalyst carriers of various sizes, metal carriers, universal three-way catalytic converters, and universal kits for three-way catalytic converters, including catalysts meeting high standards such as Euro 1, Euro 2, Euro 3, Euro 4, Euro 5, and Euro 6. OEM and ODM available. Shandong Xiao yuan Environmental Protection Technology Co. is committed to becoming a leading company in China's environmental protection technology sector, promoting the development and application of green environmental protection technologies, contributing to the sustainable improvement of the ecological environment, and creating a cleaner and better future for society.
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By abiztime
Shandong Xiaoyuan Environmental Protection Technology Co., Ltd. Specializing in Catalyst carrier, metal catalyst carrier, Three-Way Catalytic Converter, Three-Way Catalytic Converter Universal Package, Three-Way Catalytic Converter Ceramic Carrier, Automotive Ceramic Core Carrier,Truck Ceramic Inner Core Carrier, Metal Iron Core Inner Core Carrier, Automotive Emission Specific Products.( link hidden, please login to view)
Honeycomb ceramic catalyst carriers have a wide range of applications, primarily including the following:
1. Automotive Exhaust Purification
• Serves as the core component of three-way catalytic converters.
• Catalytically oxidizes and reduces harmful gases such as CO, HC, and NOₓ, achieving environmental emission standards.
2. Industrial Waste Gas Treatment
• Treats pollutants such as VOCs (volatile organic compounds), NOₓ, and CO generated in industry.
• Used in waste gas purification systems for the chemical, coating, pharmaceutical, and electronics industries.
3. Denitrification (SCR) Systems
• Utilizes selective catalytic reduction (SCR) technology in coal-fired power plants, cement plants, and boilers to remove nitrogen oxides.
• Typically carries active components such as V₂O₅–WO₃/TiO₂.
4. Municipal Waste Incineration Flue Gas Purification
• Used for high-temperature flue gas purification and dioxin emission control. 5. Chemical Catalytic Reaction Supports
• Catalyst supports used in industrial reactions such as ammonia synthesis, methanol to olefins (MTO), and alkane dehydrogenation.
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Shandong Xiao Yuan Environmental Protection Technology Co.,ltd is located in the Green Kinetic Energy Industrial Park in Guanchang Town, Ningjin County, Dezhou City, Shandong Province, with a factory area of 5,000 square meters.
primarily produce honeycomb ceramic catalyst carriers of various sizes, metal carriers, universal three-way catalytic converters, and universal kits for three-way catalytic converters, including catalysts meeting high standards such as Euro 1, Euro 2, Euro 3, Euro 4, Euro 5, and Euro 6. We support customization to meet your specific requirements and accept small batch orders for product testing.
We guarantee the quality and durability of our products.
Shandong Xiao ryan Environmental Protection Technology Co. is committed to becoming a leading company in China's environmental protection technology sector, promoting the development and application of green environmental protection technologies, contributing to the sustainable improvement of the ecological environment, and creating a cleaner and better future for society. please find more information at: www.gaslyst.com
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