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Synthesis and Characterization of Aluminophosphate Molecular Sieves Modified by Pd or Pt and their Catalytic Performance in n-Butane Conversion

WEI Yingxu, WANG Gongwei *, LIU Zhongmin, SUN Chenglin, XU Lei, DONG Zhenwu (Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian 116023, China)  
AlPO 11, SAPO 11 and Co(Mn)AlPO 11, Co(Mn)APSO 11 molecular sieves were synthesized. XRD patterns indicated that the moleclar sieves have AEL crystal structure. The elementary analysis was finished with X ray fluorescene spectrum. The acid property of the samples was tested by NH 3 TPD. The catalytic performance of the synthesized molecular sieves, modified by Pd or Pt, for isomerization and dehydroisomerization of n butane was investigated. Pd/SAPO 11 catalyst showed the highest selectivity in isomerization of n butane. It was also found that Pt/MeAPO 11 and Pt/MeAPSO 11 appeared higher selectivity in dehydroisomerization than the catalysts on base of AlPO 11 and SAPO 11 molecular sieves respectively.
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