关于BET分析方法？把表1和 lines 29-46复制上来。 Lines 29-46:The effects of crystallization times on structure parameters of different samples are listed in Table 1. According to N2 adsorption-desorption isotherm, there is no hysteresis loop in the isotherms of HZSM-5. So the macropore volumes of this sample could be attributed to the interparticle void space which detected in BET. For the sample of ZPA-1, the surface area is dropped while the ratio of Vmeso+macro/Vtotal improved. This could be attributed to much amorphous aluminosilicate in ZPA-1. By increasing the crystallization time to 3 days, as the flower-shaped crystals formed, the BET surface area of zeolite reaches to the maximum (355.3 m2/g). Meanwhile, it also has the largest pore size (4.2 nm) and the ratio of Vmeso+macro/Vtotal (73.7%). Larger pore size would be critical to the diffusion of bulky molecular gases. But as the crystallization times increased, the surface areas, pore volume, and pore size of ZPA-5 and ZPA-7 are dropped significantly compared with ZPA-3. This performance could be primarily attributed to the formation of quartz.QQ截图20141006212858.jpg，查看更多
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