波谱学杂志 ›› 1994, Vol. 11 ›› Issue (2): 157-163.

• 研究论文 • 上一篇    下一篇

MASNMR研究钯添加剂对SAPO-5分子筛的影响

肖天存1, 安立敦1, 王弘立1, 杨年华2, 袁汉珍2, 裘鉴卿2   

  1. 1. 中国科学院兰州化学物理研究所, 兰州 730000;
    2. 中国科学院武汉物理研究所波谱与原子分子物理国家重点实验室, 武汉 430071
  • 收稿日期:1993-04-19 出版日期:1994-06-05 发布日期:2018-01-20

MAS NMR STUDY ON THE EFFECT OF PALLADIUM ADDITION ON SAPO-5 MOLECULAR SIEVE

Xiao Tiancun1, An Lidun1, Wang Hongli1, Yang Nianhua2, Yuan Hanzhen2, Qiu Jianqing2   

  1. 1. Lanzhou Institute of Chemical Physics, Chines Academy of Sciences, Lanzhou 730000;
    2. State Key Laboratory of magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics, The Chinese Academy of Sciences, Wuhan 430071
  • Received:1993-04-19 Online:1994-06-05 Published:2018-01-20

摘要: 通过在SAPO-5分子筛的前身体中加入不同含量不同形式的钯盐方式,直接合成出了分子筛上担载贵金属的双功能催化剂,X光衍射(XRD)结果表明把的加入并不影响SAPO-5分子筛的生成,但降低了分子筛结晶度。当把以碱性介质加入反应物时,使产物中有少量SAPO-34伴生,由MASNMR实验结果可见,反应物中把的加入抑制了硅进入分子筛骨架,使骨架铝配位环境更加对称,并使三乙胺模板分解,改变了其在分子筛中的存在状态。从而导致分子筛结晶度的降低.

关键词: 载钯SAPO-5分子筛, MAS, NMR

Abstract: SAPO-5 molecular sicve bas been synthesized by hydrothermal method.Palladium is supported on it by adding Pd salt solution (Pd(NH3)4Cl2 and H2PdCl4)into the mixture gel of SAPO-5 before crystallizzation in order to obtain bifunctional catalyst.The result of X-ray diffraction reveals that the introduction of palladium salt in the mixture gel does not deprcss the formation of SAPO-5. However,when palladium is added in the form of Pd(NH3)4Cl2, there intergrows a little SAPO-34 in the product.MAS NMR results show that the addition of palladium obstructs silicon to enter the framework and thus makes a more symmetrical coordination environment of alumini-um and Causes partialy decomposition and polymeriZation of the template in SAPO-5.The reaction of the template during crystallization differs with the palladium precur-sors.31P MAS NMR result shows that the addition of palladium salt in the mixture gel has little influence on the coordination environment of phosphorus in the framework.

Key words: Palladium addition, SAPO-5 molecular sieve, MAs NMR