The effects of pre-oxidation of cellulose on the properties of chars for methane storage
- Univ. of Strathclyde (United Kingdom)
In the present economic climate and with ecological awareness at a high, the need for cheaper more environmentally friendly fuels has never been greater. Natural gas is an abundant and relatively clean burning fuel. It is conventionally stored at high pressures for transportation and for use as an alternative vehicle fuel, (Compressed Natural Gas (CNG) pressure is 3000 psi). Adsorbed Natural Gas (ANG) systems, which involve adsorption of gas onto porous media, (operating pressure, 500 psi), have emerged as a viable alternative to CNG for use as a storage system for natural gas as a vehicle fuel. The methane is stored in the micropores (<20 {Angstrom}) of the adsorbent where the physical forces are such that the methane is at a higher density than that of liquid methane. Weaker forces in the meso (20-200 {Angstrom}) and macro-pores (>200 {Angstrom}) mean that compressed gas at 500 psi only is stored in them. Since a finite volume (i.e. storage vessel) of adsorbent can be utilised, it is important that the adsorbent not only possesses high levels of microporosity, but that it is also of a high enough density. Activated Carbons contain high levels of microporosity and can be produced with satisfactorily high densities to be good adsorbents for methane storage. However, the process of creating an activated carbon generally involves gasification of the char with CO{sub 2}, O{sub 2} or H{sub 2}O in order to increase the overall surface area. This treatment tends to widen the porosity and thus produce higher levels of meso- and macro-pores. By paying more attention to the precursor and the effects of altering its structure on the carbon produced, it may be possible to produce a more uniform microporosity. It was therefore decided to take pure cellulose and change its structure through air oxidation, observing any changes in the porosity of the resultant carbon produced.
- OSTI ID:
- 254741
- Report Number(s):
- CONF-940813-; TRN: 96:003482-0082
- Resource Relation:
- Conference: 208. American Chemical Society (ACS) national meeting, Washington, DC (United States), 21-26 Aug 1994; Other Information: PBD: 1994; Related Information: Is Part Of 207th ACS national meeting. Volume 39, Nos. 1, 2, 3 and 4; PB: 1304 p.
- Country of Publication:
- United States
- Language:
- English
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