摘要：选取9种木材,采用干蒸裂解工艺制备生物炭材料,采用压汞法测定生物炭的孔体积、比表面积和孔径分布,并且对它们的孔隙结构进行对比研究。结果表明:由果木制备的生物炭的孔隙率最大,数值为53.13%,而桃木生物炭的孔隙率最小,数值为44.38%;通过分析生物炭材料在一定孔半径区间内的孔体积分布曲线和孔表面积分布曲线,得出了9种生物炭中小孔和微孔数量较多的为槐木和杏木,大孔和中孔数量较多的为桃木和桐木;聚类分析9种生物炭孔结构相似度发现,果木、柳木、槐木和杏木为微孔类,枸木和椿木为小孔类,柿木和桃木为中孔类,桐木为大孔类。

关键词：木材；生物炭；孔结构

Abstract： Nine kinds of wood 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 the macroporous class. 

Keywords: wood; biochar; pore structure