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