在勃姆石AlOOH溶胶中引入一定量的H2BO3溶液，经不同温度的热处理，制成不同硼掺杂含量的无支撑的γ-A12O3催化膜。用XRD、BET分别对膜的晶相和膜的微孔结构，包括比表面积、孔径和孔容进行了研究，结果发现：随着硼含量的增加，在低温下，膜的比表面积和孔容都不断增加，而对孔径的影响不大；经1200℃处理后，未掺杂硼的膜的比表面积，孔径和孔容分别为5.4m2/g,49nm和0.063cm3/g，而经掺杂16％摩尔硼的膜的比表面积，孔径和孔容分别为35m2/g,13nm和0.225cm3/g，这说明硼的掺杂对γ-A12O3膜的热稳定性有很好的改善作用。“,”The pure and Boron-doped γ-Al2O3 membranes were synthesized by the sol-gel method and the thermal stability of the unsupported alumina membrane was studied by determining the pore structure change of the membranes, including average pore size, pore volume and BET surfacearea. The experimental results show that the average pore size of the pure alumina membrane increases sharply after sintering at temperatures higher than 1000℃. Addition of 16% Boron can considerably stabilize the pore structure of the unsupported alumina membrane. The pore diameter for the B-doped membrane is stabilized within 13nm after sintering at 1200℃ for 5h.The substantial increase in the pore size for the pure alumina membrane at the sintering temperatures of 1000～1200℃ is accompanied by the phase transformation from γ-Al2O3 to γ-Al2O3. The addition of Boron can raise this phase transformation significantly and thus the thermal stability of the membranes is improved.