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Activated carbon is a versatile material with high porosity

 
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Dołączył: 30 Paź 2020
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PostWysłany: Sob Paź 31, 2020 02:59    Temat postu: Activated carbon is a versatile material with high porosity Odpowiedz z cytatem

Activated carbon is a versatile material with high porosity and surface area. The activation may be physical or chemical. Chemical activation reduces tar formation. Chemical activation is carried out with wood as the starting material. In the beginning, wood is impregnated with a concentrated solution of activating agents. It results in degradation of cellulosic material. Chemical-impregnated material is then pyrolysed at 4000 C in the absence of air. Pyrolysed product is cooled and washed to remove activating agent, which is recycled. On calcination, impregnated and chemically dehydrated raw material results in charring and aromatization, and creation of porous structure. Pottasium disulphide, alkali metal hydroxide, and carbonate and chlorides of Ca+2 ; Mg+2 and Fe+3. Activating agent acts like dehydrating agent which influences the pyrolytic decomposition and inhibit the formation of tar. Also, it decreases the formation of acetic acid, methanol etc. and enhance the yield of carbon. Due to enhanced surface properties, it has become one of the technically important material for selective separations commercially. Nevertheless, its application fields are restricted due to high cost. This difficulty has led to search for the use of cheap and efficient alternative materials such as rice husk [1], bamboo [2], sugarcane stalks [3], tamarind kernel powder [4], palm shell [5] babool wood [6], bagasse, fly ash [7], ashoka leaf powder [8], coir pith [9] and banana pith [10] etc. Biomass wastes are considered to be a very important feedstock because they are renewable sources. Activated carbon such produced can be used as effective adsorbent because of high adsorptive capacity. However, continuous production of activated carbon with reproducibility of characteristics is restricted by the seasonal availability of the starting material. To address this issue partly, Coconut shell coconut shell activated carbons
which is available throughout the year irrespective of season, is used as starting materials for carbon preparation. Rubber industry is a huge consumer of carbon as reinforcing material. The filler is used to impart certain properties to the rubber material such as colour, hardness and strength up to certain extent. For activation, the surface of carbon modifies to develop newer reactive cites inclusive of ester, ether and carboxylic. NBR is a complex family of workhorse elastomers. The unique balance of oil, chemical, heat and cold resistance allows it to work well in a wide variety of automotive and industrial applications. The nitrile rubber, is used for study. Russian raw rubber normally used to blend with PVC for automobile applications. Nitrile rubber (CH2-CH=CH-CH2) is generally resistant to aliphatic hydrocarbons. When compounded with activated carbon, the ester and ether linkages present on activated carbon may entangle with zinc present in rubber improves physical properties.desulfurization activated carbon
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Wysłany: Sob Paź 31, 2020 02:59    Temat postu:

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