ISSN:
1432-5225
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Summary Changes in the submicroscopic porosity in southern pine latewood resulting from pyrolysis at temperatures through 600°C were measured using small-angle X-ray scattering. Two types of scattering curves were observed: the first was obtained for wood and for less intense heat treatment; and the second, for samples heated above 300°C. This change was found to be associated with the thermal degradation of crystalline cellulose in the sample. Specific surfaces and the average dimensions of macropores and micropores were calculated from the second type of scattering curve. The specific surface was found to increase from 1.2 to 2.3 m2/gm as the temperature and heating time increased. The average dimensions of the macropores calculated from the scattering curves was about 15 nm. The first effect of heating sufficiently to decompose the crystalline cellulose was found to be the production of micropores with average diameters of about 0.7 nm. Micropore volume increased from 0.06 cm3/gm for the lower heating temperatures to about 0.13 cm3/gm for samples heated to 600°C. The average micropore dimension increased as the temperature was raised and the samples were heated for longer times.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00349913
