THE ISOTHERMAL KINETICS OF VOLATILE MATTER RELEASE FROM ANTHRACITE
Special Research Report SR-16 The isothermal kinetics of hydrogen evolution from St. Nicholas anthracite were studied aIJ,d fQund to be such as would be expected for the desorptiop. of a gas which is chemisorbed on to the surface. The rate of hydrogen .release appears to follow a zero order law during the initial stages of the reaction, where the surface coverage is greater than 95%. When the surface coverage falls below 95%, how .. ever. a gradual deviation from zero kinetics was observed, and in this range the- volume of hydrogen evolved was found to be proportional to the logarithm of the time. The energy of activation for the desorption of hydrogen from anthracite was determined for various surface coverages and was found to vary linearly with the fraction of surface covered. The energy of activation for zero coverage was found by extrapolation to be approximately 180 kcals. per mole. The effect of particle size on the rate of hydrogen desorption was studied, and it was found that for St. Nicholas anthracite the rate of hydrogen release increases with increasing particle si.ze. This, however, was not found to be the case for other anthracites. The rate of volatile matter evolution from Loree anthracite was observed to decrease wlith increasing particle size, while from Dorrance and Glen Burn anthracites the rate of desorption decreases to a minimum with increasing particle size and was then found to increase. For Jeddo anthracite a slight maximum in the rate of desorption was observed with increasing particle size. It is thoughUhal the effect of particle size on the rate of volatile · matter release bears some relationship to the decrepitation properties of an anthracite.
|Work Title||THE ISOTHERMAL KINETICS OF VOLATILE MATTER RELEASE FROM ANTHRACITE|
|License||Attribution-NonCommercial-NoDerivs 3.0 United States|
|Deposited||July 27, 2016|
This resource is currently not in any collection.