Electrical Conductivity Of Carbon Pellets Prepared From Mixtures Of Pyropolymers From Oil Palm Bunches and Petroleum Green Coke

摘要

Green pellets (GPs), prepared at different compression pressures (cs = 6,7.5 and 12 metric tonne) from mixtures containing self-adhesive carbon grains (sacg) from the oil palm empty fruit bunch (EFB) and different percentages (pr = 0 to 90 %) of a non self-adhesive powder of petroleum green coke (ppgc), were carbonized (800°C) and activated with CO_2 to produce carbon pellets (CPs). The measured electrical conductivity (σ) of the CP for all cs showed a curve having a minimum value at pr around 50 %, indicating that the conducting phase displays a nonlinear σ–pr relationship. A significant increase in the a due to CO_2 activation was observed. For a sufficienctly high cs, an existence of a pr range in which the a varies linearly with the density was also observed. These results provide some new information for modifying the electrical conductivity of carbon derived from the sacg from EFB or other types of biomass.