利用溶胶-凝胶法在Υ-Al2O3/α-Al2O3多孔支撑体上合成了微孔二氧化硅膜,并用IR、TG、FESEM、N2吸附以及气体渗透等手段对二氧化硅膜进行了研究.结果表明,200℃时H2的渗透率达到2.3×10-7mol·m-2·Pa-1·s-1,H2/CO2的分离系数为8.0,然而当二氧化硅膜长期暴露于潮湿环境时,由于水气与孔表面羟基相互作用引起二氧化硅膜孔结构的崩溃,最终导致H2渗透率和H2/CO2分离系数剧烈下降.
Microporous silica membranes on Υ-Al2O3/α-Al2O3 porous supports were prepared by a sol-gel process, and characterized by IR, TG, FE-SEM,N2 adsorption as well as gas permeation. The H2 permeance of 2.3×10-7mol·m-2·Pa-1·s-1 and H2/CO2 separation factor of 8.0 were measured with the as-prepared membrane at 200℃. Deterioration of the membrane performance in the humid atmoshphere was observed, which can be attributed to the collapse of the pore structure caused by the reaction between surface hydroxy group and water vapor.
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