新型ZrAPO-11分子筛的合成与表征

THE SYNTHESIS AND CHARACTERIZATION OF NEW-TYPE ZrAPO-11 ZEOLITE

利用水热法合成了APO-11、SAPO-11和ZrAPO-11分子筛.XRD结果证实,三者具有相同的AEL分子筛晶体结构;SEM照片显示,SAPO-11与APO-11都为5 μm～10 μm的球形颗粒,而ZrAPO-11呈10 μm～15 μm的棒状晶粒;N2吸附显示,除了0.45 nm的特征微孔外,三种分子筛还具有3.8 nm～3.9 nm的中孔结构;表面吸附和酸度表征证实,Zr主要存在与分子筛的孔道内,而Si则部分进入分子筛的骨架;吸附吡啶的DG-DTA研究发现,APO-11、ZrAPO-11同为弱酸性材料,而SAPO-11具有更强的酸性;原粉的DG-DTA证实,合成的稳定性良好,崩塌温度超过1 000 ℃.

APO 11,SAPO 11 and ZrAPO 11 molecular sieves were hydrothermally synthesized The results of XRD determination showed that they have the same crystalline structure: AEL type alumina phosphate zeolites APO 11 and SAPO 11 are sphere grains while ZrAPO 11 zeolite bears bar like crystalline Besides the feature pore of the SAPO 11, ZrAPO 11 and APO 11 is micropore of 0 45?nm, there is mesopore of 0 37?nm～0 38?nm, which was supposed to result from the interstice among crystallines Adsorption of N 2 results and analysis of acidity indicated that Zr atoms mainly deposit in the channels of the APO 11 samples while Si atoms partially tailor in the framework of APO 11 zeolite ZrAPO 11 and APO 11 were weak acidic materials while the SAPO 11 belonged to the medium strong acidic material APO 11, SAPO 11 and ZrAPO 11 zeolites are all of rather good thermal stability with collapse temperature higher than 1?000?℃