《Table 2 Acidity of H-ZSM-5 ze olite s with diffe re nt SiO2/Al2O3ratios》

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《H-ZSM-5分子筛硅铝比对其催化的甲醇转化丙烯选择性的影响（英文）》

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a:the amounts of weak，medium，and strong acid sites were calculated from the NH3-TPD profiles by integrating the ammonia desorption lines in the range of 373-500，500-600，and 600-923 K，respectively；b:the ratio of Brnsted to Lewis（B/L）acidity is obta

Figure 1 show s the XRD patterns of H-ZSM-5zeolites；all the synthesized samples display the typical diffraction peaks of intrinsic M FI structure.Taking HZ-5（4000）zeolite as a reference，they all havearelativecrystallinityof90%-100%，demonstrating their highly crystalline M FI structure.The textural properties determined from the nitrogen adsorption-desorption isotherms are summarized in Table 1；all the synthesized H-ZSM-5 samples have a similar BET surface area（415-430 m2/g）and micro surface area（306-341 m2/g），as w ell as almost the same pore volume（0.20 cm3/g）and micropore volume（0.15 cm3/g）.In addition，as estimated by Scherrer’s method from the diffraction peak of（011）plane at 7.9°，all the as-synthesized samples have a similar crystal size of 66-73 nm（Table 1）.