偏高岭土水热合成Y型分子筛的动力学研究

Dynamic Studies on the Hydrothermal Synthesis of Y-zeolite from Metakaolin

摘要: 采用苏州和茂名偏高岭土作原料,在不同温度下水热合成Y型分子筛,测定不同晶化时间产物的相对结晶度,绘出晶化曲线,根据晶化曲线计算苏州和茂名偏高岭土合成Y型分子筛的成核活化能和晶体生长活化能.茂名偏高岭土水热合成的Y型分子筛:Ea成核=29.48 kJ/mol,Ea生长=18.89 kJ/mol;苏州偏高岭土水热合成的Y型分子筛:Ea成核=23.81 kJ/mol,Ea生长=17.38 kJ/mol.讨论了造成这些活化能差异的原因.

Abstract: Y-zeolite with Suzhou metakaolin and Maoming metakaolin as raw materials was synthesized by hydrothermal method at different temperature.The crystallinity of Y-zeolite was analyzed by XRD,thus crystallization curves were obtained.The activation energies of nucleation and growth of Y-zeolite synthesized from metakaolin were calculated according to crystallization curves.For Maoming metakaolin,Eanucleation=29.48 kJ/mol,Eagrowth=18.89 kJ/mol,while for Suzhou metakaolin,Eanucleation=23.81 kJ/mol,Eagrowth=17.38 ...