Monolithic Catalyst Vs Ceramic Honeycomb

Monolithic catalyst substrates figure 1 are made of ceramics or metal.

Monolithic catalyst vs ceramic honeycomb.

Automotive oem s predominately utilize these parts due to their lower component costs. In this paper the current status of the monolith technology for applications in the chemical industry is reviewed. The pelleted design is obsolete and increasingly difficult to find on the market. 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.

Monoliths are sometimes called flow through substrates. Ceramic substrates honeycombs usually have square cells while most metallic substrates have sinusoidal channels. Application areas in which monolithic catalysts have superior performance. In the off road emission control applications monolithic metallic or ceramic catalyst supports became the standard.

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. Monolithic catalyst supports are honeycomb structures with many small cells or parallel channels that allow exhaust gases to run axially through the catalyst. The flow pattern in the monolithic catalyst reactor was segmented gas liquid flow slug flow. Honeycomb shaped monolithic catalysts are the standard catalyst shape in most environmental applications.

The hydrogen pressure and the temperature were varied between 30 40 bar and 509 523 k respectively. Many coating companies will suggest ceramic to avoid production. 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. Ceramic substrates have been the choice for catalyst coating companies for decades.

In the processes of the chemical industry however their current use is very limited. 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. A catalyst support provided with an activated alumina layer which is formed on the surface of the ceramic honeycomb structure is disclosed. Engineers prefer metallic coating companies prefer ceramic.

Other channel cross sections are possible including triangular hexagonal trapezoidal and round. Applied catalysts manufactures a wide variety of abate voc ceramic monolith supported catalysts. Metallic vs ceramic catalyst substrates.