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N_2吸附等温线及BJH脱附孔分布结果表明:当钛含量合适时,所合成的Ti-Si沸石具有非常均匀的孔结构。TS-1沸石(ZSM—5型)的BET表面积为386—423m ̄2/g,TS-2沸石(ZSM-11型)的BET表面积为355—456m ̄2/g,且均随合成沸石中钛含量增加而呈下降的趋势。吸附结果表明Ti-Si沸石均有明显的疏水性,其正己烷的吸附量明显高于环己烷,随钛含量不同而发生变化,但其H_2O_2的吸附量却随钛含量增加而显著增大。NH_3—TPD试验表明,Ti-Si沸石表面酸性相当弱,根本不存在强酸中心。
The results of N 2 adsorption isotherm and BJH desorption pore distribution show that the Ti-Si zeolite synthesized has a very uniform pore structure when the titanium content is suitable. The BET surface area of TS-1 zeolite (ZSM-5 type) is 386-423 m 2 / g and that of TS-2 zeolite (ZSM-11 type) is 355-456 m 2 / g, Titanium content increased and declined. Adsorption results show that Ti-Si zeolite has obvious hydrophobicity. The adsorption amount of n-hexane is obviously higher than that of cyclohexane, and changes with the content of titanium. However, the adsorption amount of H 2 O 2 increases significantly with the increase of titanium content . NH_3-TPD test shows that the surface of Ti-Si zeolite is rather weak and there is no strong acid center at all.