1. Basic Introduction of Three Catalyst Types

（1）Metal Honeycomb Monolith Catalyst

Made of ultra-thin Fe-Cr-Al alloy foil as the substrate, processed into regular honeycomb structure via stamping, winding and brazing. Its surface is loaded with γ-Al₂O₃ rare earth coating and nano-scale Pt/Pd/Pt-Pd noble metal active components. As a monolithic honeycomb catalyst, it is designed for VOC catalytic oxidation under harsh working conditions and serves as the core consumable for RCO equipment.

（2）Ceramic Honeycomb Monolith Catalyst

Adopts cordierite as the core substrate, integrally extruded into a regular straight-hole honeycomb structure. The surface is coated with high-specific-surface-area alumina coating and rare earth oxygen storage materials, loaded with noble metal active components. It is the most cost-effective universal monolithic catalyst for industrial VOC catalytic oxidation (CO/RCO), suitable for standard modular loading.

（3）Extruded Pellet/Granular Catalyst

Uses γ-alumina or molecular sieve as the substrate, mixed and extruded then cut into granules such as cylinder, trilobe, quadrilobe and hollow strip shapes, loaded with noble metal active components. Positioned between traditional bulk granules and monolithic honeycombs, it combines loading flexibility and catalytic activity, belonging to structured bulk granular catalysts.

2. Core Application Scenarios

Metal Honeycomb Monolith Catalyst

Large air volume exhaust treatment, regenerative catalytic oxidation (RCO) equipment, frequent start-stop working conditions, high-temperature thermal shock scenarios, strict low pressure drop requirements, VOC exhaust treatment in chemical, petrochemical and painting industries with slight dust and vibration.

Ceramic Honeycomb Monolith Catalyst

Conventional catalytic combustion (CO) equipment, zeolite rotor + CO combined process, small to large air volume standard working conditions, general VOC exhaust treatment in painting, printing, ink, plastic and pharmaceutical industries, universal scenarios with moderate budget and no severe thermal shock.

Extruded Pellet/Granular Catalyst

Small to medium air volume exhaust treatment, old fixed bed reactor renovation, easily blocked working conditions, exhaust with high dust and oil content, local loading and maintenance of equipment, small and medium-scale VOC treatment projects with limited budget.

3. Core Advantages

• Metal Honeycomb Monolith Catalyst: Ultra-low pressure drop, high temperature resistance & excellent thermal shock stability, anti-vibration and unbreakable, washable and regenerable, lightweight, adaptable to ultra-high gas hourly space velocity (GHSV), extremely strong long-term operation stability.
• Ceramic Honeycomb Monolith Catalyst: Extremely high cost performance, good chemical stability, acid and alkali resistance, strong coating adhesion, convenient modular assembly, moderate pressure drop, low operation cost, suitable for most conventional working conditions.
• Extruded Pellet/Granular Catalyst: Flexible loading, easy local replacement, strong anti-clogging ability, no strict requirements for reactor shape, low renovation difficulty, lower cost than monolithic honeycombs, ideal for easily blocked scenarios.

4. Professional Comparison Table of Three Catalysts

Comparison Items	Metal Honeycomb Monolith Catalyst	Ceramic Honeycomb Monolith Catalyst	Extruded Pellet/Granular Catalyst
Core Substrate	Fe-Cr-Al Alloy Foil	Cordierite	γ-Alumina/Molecular Sieve
Pressure Drop Level	Ultra-low	Low	Moderate
Operating Temperature Range	220-850℃ (1200℃ Short-term)	200-600℃	230-580℃
Thermal Shock Resistance	Excellent	Good	Fair
Anti-vibration Performance	Excellent	Poor, Easy to Break	Good
Regenerability	Washable Regeneration	Non-washable, High-temperature Calcination Regeneration	High-temperature Calcination Regeneration
Cost Performance	High-end, Relatively High Cost	Extremely High, Economic First Choice	Medium, Moderate Cost
Applicable GHSV	15000-40000h⁻¹	8000-20000h⁻¹	5000-15000h⁻¹
Matched Equipment	RCO, Large Air Volume CO	Conventional CO, Zeolite Rotor + CO	Fixed Bed Reactor, Old Equipment Renovation

Key Notes: All catalysts adopt Pt/Pd/Pt-Pd bimetallic noble metal active components, with purification efficiency ≥95% for conventional VOCs under standard working conditions. Selection shall be based on air volume, exhaust composition, temperature, equipment type and budget.