For particulate filtration nonwoven materials are widely used materials. For the removal of gaseous substances these materials are combined with additional components. In most cases a bulk filtration material like activated carbon or other adsorbent substrates are placed additionally to the nonwoven material in a filter housing. Substances like phosgene or hydrogen cyanide are usually adsorbed by reactive adsorption on copper oxide impregnated activated carbon. In these cases the substances react with the adsorbent so the material is consumed.
Common examples of such a combination filter are cartridges for respiratory filters. Besides a particulate filter pellets of impregnated activated carbon or metal oxides and also catalysts are placed in the cartridges. For example, to oxidize carbon monoxide to carbon dioxide a mixture of copper and manganese oxide, known as “Hopcalite”, is commonly used.
Furthermore, combining the function of the catalyst and the particulate filter in one material is advantageous to save space in a filtration device and may also simplify the manufacturing process of such devices.
In this presentation different methods are presented to immobilize small catalytic particles on a nonwoven fabric.
Session: G15 - Gaseous Compounds Separation
Day: 13 October 2016
Time: 14:45 - 16:00 h