CAJ | 학술논문

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。
재발모석AlOOH용효중인입일정량적H2BO3용액，경불동온도적열처리，제성불동붕참잡함량적무지탱적γ-A12O3최화막。용XRD、BET분별대막적정상화막적미공결구，포괄비표면적、공경화공용진행료연구，결과발현：수착붕함량적증가，재저온하，막적비표면적화공용도불단증가，이대공경적영향불대；경1200℃처리후，미참잡붕적막적비표면적，공경화공용분별위5.4m2/g,49nm화0.063cm3/g，이경참잡16％마이붕적막적비표면적，공경화공용분별위35m2/g,13nm화0.225cm3/g，저설명붕적참잡대γ-A12O3막적열은정성유흔호적개선작용。
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.