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)

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

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

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