Monolithic Catalyst Vs Ceramic Honeycomb

Ceramic substrates honeycombs usually have square cells while most metallic substrates have sinusoidal channels.

Monolithic catalyst vs ceramic honeycomb.

Monolithic ceramics and heterogeneous catalysts. The hydrogen pressure and the temperature were varied between 30 40 bar and 509 523 k respectively. In the off road emission control applications monolithic metallic or ceramic catalyst supports became the standard. In the case of honeycombs cordierite is the.

In this paper the current status of the monolith technology for applications in the chemical industry is reviewed. 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. Other channel cross sections are possible including triangular hexagonal trapezoidal and round. Many coating companies will suggest ceramic to avoid production.

Application areas in which monolithic catalysts have superior performance. Engineers prefer metallic coating companies prefer ceramic. Monolithic catalyst substrates figure 1 are made of ceramics or metal. Automotive oem s predominately utilize these parts due to their lower component costs.

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. The pelleted design is obsolete and increasingly difficult to find on the market. Metallic vs ceramic catalyst substrates. The flow pattern in the monolithic catalyst reactor was segmented gas liquid flow slug flow.

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. Honeycomb shaped monolithic catalysts are the standard catalyst shape in most environmental applications. In the processes of the chemical industry however their current use is very limited. Monoliths are sometimes called flow through substrates.

Today almost all automobiles are equipped with either ceramic or metallic honeycomb supported catalysts. Ceramic substrates have been the choice for catalyst coating companies for decades. 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.