Hoonpai - Catalytic Converter, DPF, DOC, SCR & Emission Control Systems

About Hoonpai

Huizhou Hompi Industrial Co., Ltd., operating as Hoonpai, is a professional manufacturer specializing in exhaust aftertreatment systems with nearly 15 years of experience in canning, housing, and catalyst coating technologies.

We provide high-performance catalytic converters, diesel particulate filters (DPF), diesel oxidation catalysts (DOC), selective catalytic reduction (SCR) systems, and industrial denitrification solutions for a wide range of applications including trucks, off-road vehicles, mining equipment, power generators, and industrial boilers.

15+

Years Experience

50+

Global Clients

Our Products

Comprehensive range of emission control systems designed for road, off-road, industrial, and marine applications.

Catalytic Converter

High-efficiency catalytic converters for gasoline and diesel engines, designed to reduce CO, HC, and NOx emissions.

Diesel Particulate Filter (DPF)

Ceramic honeycomb filter that captures and removes soot and particulate matter from diesel exhaust.

Diesel Oxidation Catalyst (DOC)

Converts harmful pollutants like CO and HC into less harmful CO2 and H2O through oxidation.

Selective Catalytic Reduction (SCR)

Uses urea-based reductant (AdBlue) to convert NOx into nitrogen and water, meeting strict emission standards.

Particulate Oxidation Catalyst (POC)

Combines DOC and partial filtration to reduce particulate matter in low-load diesel engines.

Substrate/Core

Substrate & Core

High-quality substrates made from silicon carbide, cordierite, and metal for various catalyst applications.

Clamp & Gasket

Exhaust Clamp & Gasket Kit

Durable clamps and sealing kits for secure exhaust system connections and leak-free performance.

Custom Catalyst

Custom Catalyst Solutions

Tailored emission systems for diesel trucks, off-road vehicles, generator sets, and marine ships.

Industrial SCR

Industrial Denitrification (V-SCR, Cu-SCR)

Designed for power plants, waste incineration, and boiler systems to reduce NOx emissions.

Robotic Coating

Robotic Catalyst Coating

Precision robotic application system for uniform catalyst loading and optimal performance.

Applications

Road Vehicles

• National IV and V catalysts: V-SCR, ASC
• National VI catalysts: DOC, Cu-SCR/Fe-SCR, CDPF, ASC
• OEM truck manufacturer supply
• Passenger and commercial vehicles

Off-Road Vehicles

• Construction and agricultural machinery
• DOC and CDPF systems
• V-SCR and Cu-SCR options
• Mining and heavy-duty equipment

Industrial Denitrification

• Power plants and backup generators
• Waste incineration facilities
• Boiler and stationary source NOx reduction
• V-SCR and Cu-SCR systems

News & Events

January 12, 2025

Polish Client Factory Tour

Welcoming our Polish partners to our state-of-the-art diesel catalyst factory was a great honor. We showcased our advanced production line for DPF, DOC, and SCR systems.

October 20, 2025

Welcoming Brazilian Partners

Our guests observed first-hand our rigorous quality control and precision engineering processes at our Tianjin factory.

December 3, 2024

Brazilian Guests' Journey

Recently, our company had the honor of hosting a delegation of guests from South Africa to discuss optimization and updates.

What is a DPF and how does it work?

A Diesel Particulate Filter (DPF) is a device designed to remove diesel particulate matter or soot from the exhaust gas of a diesel engine. It uses a ceramic honeycomb structure to trap soot particles, which are later burned off during regeneration.

What's the difference between DOC and SCR?

A Diesel Oxidation Catalyst (DOC) reduces carbon monoxide (CO) and hydrocarbons (HC) by oxidizing them into CO2 and water. A Selective Catalytic Reduction (SCR) system reduces nitrogen oxides (NOx) by injecting a reductant like AdBlue, converting NOx into nitrogen and water.

Do you offer custom emission solutions?

Yes, Hoonpai specializes in custom catalyst solutions for diesel trucks, off-road vehicles, generator sets, marine ships, and industrial applications. Our engineering team works closely with clients to meet specific space, performance, and regulatory requirements.

What industries do you serve?

We serve the road transportation, off-road machinery (construction, agriculture, mining), industrial power generation, waste incineration, and marine industries with comprehensive emission control systems.

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Advanced Emission Control Solutions