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磷改性ZSM-5沸石水热稳定性提高的理论研究 被引量:14

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摘要 采用密度泛函理论和团簇模型在微观角度研究了磷改性ZSM-5沸石的水热稳定性.通过计算水解能证实加磷提高了沸石的水热稳定性.进一步研究了在水分子环境下沸石脱铝的初步过程发现,Al—O配位键在水分子的作用下易断裂,一到三个水分子可以和骨架Al形成较稳定的配位键并释放能量.我们的计算从热力学和动力学的角度证明了磷改性可以抑制脱铝发生.计算的27AlNMR化学位移和实验值一致,验证了预测结构的合理性.
作者 杨静 孙淮
出处 《中国科学(B辑)》 CSCD 北大核心 2008年第10期881-887,共7页 Science in China(Series B)
基金 国家重点基础研究发展计划(编号:2003CB615804)资助项目
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