【摘要】 无定形凝胶（Na₂O-B₂O₃-Al₂O₃-SiO₂-H₂O）在Et₃N-EDA-H₂O蒸气中结晶形成含硼和铝的ZSM-5沸石。用XRD和计算所得的晶体结构参数、TG-DTA、FT-IR、NH₃-TPD对反应合成的B-Al-ZSM-5沸石进行了表征。结果表明,蒸气相法合成的沸石样品,孔道更趋于椭圆,有利于对二甲苯的生成。在二甲苯临氢异构化反应中,活性和选择性分别为82.8w%和21.2w%,合成B-Al-ZSM-5的催化性能和表面酸性的测定与晶体结构一致。更多还原

【Abstract】 Zeolite ZSM-5 containing boron and aluminum was prepared from amorphous Na₂O-B₂O₃-Al₂O₃-SiO₂-H₂O system in Et₃N-EDA-H₂O vapour phase. The synthetic product B-Al-ZSM-5 was identified by XRD, TG-DTA, FT-IR, NH₃-TPD, the activity and selectivity for isomerization of o-xylene to p-xylene was also tested. Results show that the channels of the synthetic B-Al-ZSM-5 prepared from the vapour phase appear more elliptical as compared with typical ZSM-5 zeolite, suggesting a benefical effect for the diffusion of p-xylene in the channels.更多还原