Synthesis and characterization of aluminophosphate molecular sieves modified by Pd or Pt and their catalytic performance in n-butane conversion

Abstract

AlPO-11, SAPO-11 and Cb(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 NH3-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.