Nine kinds ofwood were selected to prepare biochars through dry
steam cracking. The pore volume, specific surface area and pore size
distribution of the biochars were measured by mercury porosimetry. The
pore structures of the nine kinds of biochars were compared. The results
show that the biochars made from Malus pumila wood has the biggest
porosity, which is 53.15%, and the biochars made from mahogany has the
smallest porosity, which is 44.38%. Through analyzing the pore volume
distribution curves and pore surface area distribution curves of the biochars,it’s shown that the quantities of minipore and micropore are much more in
locust and apricot wood, and the quantities of macropore and micropore are
much more in mahogany and candlenut. The pore structure similarity of the
nine kinds of biochars was analyzed through clustering, which shows that
Malus pumila wood, willow, locust, and apricot wood belong to the
microporous class, citron wood and ailanthus wood belong to the
miniporous class, calamander and mahogany belong to the mesoporous
class, and candlenut belongs to themacroporous class.
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