【摘要】 采用溶胶凝胶法将H₃BO₃引入到Al（OH）₃透明溶胶,经多次成膜干燥烧成制得具备一定脱硫效果的γAl₂O₃复合膜,以探索烟气脱硫的新方法。用扫描电镜、X射线衍射、BET（Brunauer Emett Teller）法分别对膜的表面结构、晶相组成和孔结构进行了研究。结果表明:（1）所制得的γAl₂O₃B₂O₃复合膜是连续均匀的,掺B₂O₃量的增加对其表面结构未发现有显著影响。（2）掺杂B₂O₃后,一方面会促进胶粒重排,加快胶粒间空隙变形和缩小,而形成小孔,小孔数目则有所增加,使得掺杂B₂O₃后膜的总孔容、比表面积都会有所增大;另一方面B₂O₃的比表面积远小于Al2O3的比表面积,掺B2O3量的增加会使膜的比表面积减小;因而在正负效应作用下,复合膜的比表面积与总孔容的变化曲线出现了极值。（3）γAl₂O₃B₂O₃复合膜在脱硫过程中起主要作用,其吸附二氧化硫的过程中既存在物理吸附又存在化学吸附,脱硫率均大于40%。当掺10%（按摩尔计）B₂O₃时,实验所获得的γAl₂O₃B₂O₃复合膜的比表面积和总孔容为最大值,分别为4.4908m2/g和0.009852cm3/g,其脱硫效果最好,脱硫率达到了61.87%。更多还原

【Abstract】 A new method of flue gas desulphurization was investigated by preparation of γAl₂O₃B₂O₃ composite membranes with a certain desulphurization ability using the sol gel method with Al（OH） 3 transparent sol doped with H₃BO₃ after several repetitions of the forming drying sintering process. The pore structure and the crystal phase of the membranes were investigated by the scanning electron microscopy （SEM）, X-ray diffraction （XRD） and Brunauer Emett Teller （BET） methods. The results indicate that: （1） The membranes are continuously even. SEM observation reveals that with the increase of the amount of B 2 O 3 doped there is no remarkable influence on the surface structures of the membranes.!（2） On the one hand, by adding B₂O₃ the colloidal particle rearrangement can be promoted, and the gap between the colloidal particles can be distorted rapidly and reduced to form small pores. Then along with the increase of small pores, the BET surface area and total pore volume of the γ Al₂O₃ composite membranes increase. On the other hand, the specific surface area of B 2 O 3 is much smaller than that of γ– Al₂O₃ , so the BET surface area of the membrane will decrease with the increase of the amount of B 2 O 3 added. Therefore under positive and negative effects, the specific surface area and total pore volume in the change curves of the membrane demonstrate an extreme value. （3） The main effect of the γAl₂O₃B₂O₃ composite membranes occur in physical and chemical absorptions during the desulphurization process. The desulphurization ratio is greater than 40%. When 10% （in mole ） B 2 O 3 is added, the specific surface area and total pore volume of the γAl₂O₃B₂O₃ composite membrane obtained are the maximum values of 4.490 8 m²/g and 0.009 852 cm³/g, and the desulphurization effect is the best, with the desulphurization ratio reaching 61.87%.更多还原