Advanced Technology

Example of Metal Honeycomb Catalyst

Oxidation Catalysts for Volatile Organic Compounds (VOCs)
VOC = Volatile Organic Compounds

A high VOC removal/deodorizing efficiency can be achieved with small highly active catalysts.

Metal honeycomb surfaces are coated with catalysts using precious metals such as platinum and palladium to provide high-performance honeycomb catalysts for VOC treatment etc.

Metal Honeycomb Catalysts

Features

  • More highly active than ceramic honeycomb catalysts etc. because the wash-coat layer supporting the catalytic precious metal is thinner
  • The metal honeycomb structure has a larger surface area than conventional structures with the same number of cells.
  • The metal honeycomb structure has a high cross section aperture ratio, reducing the drop in gas pressure.
  • The metal catalyst structure has a high physical strength against drop impact and pushing force.
  • Can be reactivated and recycled (VOC treatment type).

Catalytic Oxidation of Volatile Organic Compounds (VOCs)

Catalytic Oxidation of Volatile Organic Compounds (VOCs)
Comparison of the Characteristics of Catalytic Supports
Type Metal Honeycomb Ceramic Honeycomb Pellet
Photograph
Substrate composition Fe-Cr-Al SiO2-Al2O3-MgO γ-Al2O3
Thermal conductivity Large Small Small
Packed density 0.4~0.6 0.6~0.7 0.4~0.8
Heat capacity Small Middle Large
Space velocity 30,000~60,000h-1 20,000~40,000h-1 10,000~30,000h-1
Pressure drop* 5.5 7.1 41.5
Mechanical strength Strong Weak Middle
Thermal shock resistance Strong Weak Middle

*Pressure drop at 1.0 Nm/sec, 200°C

Sizes and Capacity of Metal Honeycomb Catalysts (for reference)
Shape Catalyst size (mm) Catalyst volume (ml) Gas flow rate (L/min)
Cubic shape 50×50×50 125 63~125
100×100×50 500 250~500
150×150×50 1125 563~1125
150×150×75 1688 844~1688
Cylindrical shape φ56×50 123 62~123
φ84.5×50 280 140~280
φ109×50 467 234~467
φ158.5×50 987 494~987
φ158.5×75 1480 740~1480
φ209×50 1715 858~1715
φ309.5×50 3762 1881~3762

VOC Removal Efficiency of Metal Honeycomb Catalysts

VOC Removal Efficiency of Metal Honeycomb Catalysts

*1 Space Velocity = (Flow rate of gas flowing though the catalyst per hour) / (Catalyst volume)

PHC (Pre-Heater and Catalyst)

PHC has a sheath heater and metal catalyst built in the stainless steel tube which is mounted on the exhaust pipe to treat VOC gases.
PHC is particularly useful when the flow rate is small. In addition, tar accumulation can be prevented by installing PHC in the upstream side of the exhaust pipe.

PHC

PHC

Electric heater

Electric heater
Specifications of PHC (for reference)
Diameter size Heater capacity (kW) Catalyst volume
50A 0.9 Determined depending on the substance to be treated and flow rate.
80A 2.0
100A 2.6,4.0
150A 5.0,7.0,9.0
200A 9.0,10.5

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