Monolithic Catalyst Vs Ceramic Honeycomb

Ceramic substrates have been the choice for catalyst coating companies for decades.

Monolithic catalyst vs ceramic honeycomb.

In the processes of the chemical industry however their current use is very limited. Metallic vs ceramic catalyst substrates. Application areas in which monolithic catalysts have superior performance. Applied catalysts manufactures a wide variety of abate voc ceramic monolith supported catalysts.

Monolithic catalyst supports are honeycomb structures with many small cells or parallel channels that allow exhaust gases to run axially through the catalyst. Monolithic catalyst substrates figure 1 are made of ceramics or metal. Honeycombs and foams william m carty and peter w lednor recent advances have been made in research on ceramic monolithic catalyst supports particularly on honeycombs and ceramic foams. Many coating companies will suggest ceramic to avoid production.

Each monolith contains thousands of parallel channels or holes which are defined by many thin walls in a honeycomb structure the channels can be square hexagonal round or other shapes. Ceramic substrates honeycombs usually have square cells while most metallic substrates have sinusoidal channels. Today almost all automobiles are equipped with either ceramic or metallic honeycomb supported catalysts. Automotive oem s predominately utilize these parts due to their lower component costs.

The flow pattern in the monolithic catalyst reactor was segmented gas liquid flow slug flow. A catalyst support provided with an activated alumina layer which is formed on the surface of the ceramic honeycomb structure is disclosed. Monoliths are sometimes called flow through substrates. Monolithic ceramics and heterogeneous catalysts.

Engineers prefer metallic coating companies prefer ceramic. The pelleted design is obsolete and increasingly difficult to find on the market. Honeycomb shaped monolithic catalysts are the standard catalyst shape in most environmental applications. Monoliths for automotive catalytic converters are made of a ceramic that contains a large proportion of synthetic cordierite 2mgo 2al 2 o 3 5sio 2 which has a low coefficient of thermal expansion.

In this paper the current status of the monolith technology for applications in the chemical industry is reviewed. In the off road emission control applications monolithic metallic or ceramic catalyst supports became the standard. The catalyst support of the present invention is formed of ceramic such as cordierite of which coefficient of thermal expansion is lower than alumina and is provided with microcracks which occur when the honeycomb structure is formed.