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Synthesis and characterization of APOll molecular sieves substituted by Si or Ti
HU Song-qing1,XU Ben-jing2,YAN Zi-feng2,BAI Xiao-hong3,YU Jing3
(1. College of Phsical Science and Technology in China University of Petroleum,Dcmgying 257061, Shandong Province,China;2. State Key Laboratory for Heavy Oil Processing in China University of Petroleum,Dongying 257061,Shandong Province, China ;3. Research Institute of Daqing Petrochemical Company? Daqing 163714, Heilongjiang Province, China)
Abstract:
The synthesis methods of A1PO-11, SAPOll and TAPOll molecular sieves substituted by Si or Ti were proposed. The molecular sieves were characterized by the techniques of X-ray diffraction (XRD), scanning electron microscopy (SEM),thermo-gravimetric/differential thermal analysis (TG/DTA) and N2-adsorption. The effects of ratio of Si/Al, Ti/ Al and crystallization temperature on synthesis of molecular sieves were discussed. The XRD results show that SAPO and TAPO molecular sieves with AEL structure can be obtained. The SEM results show that there is a great difference between the shapes of A1PO-11 and TAPO-11, and no great difference between the shapes of A1PO-11 and SAPO-II. The BET results show that the pore diameters and pore volumes are influenced by the incorporation of Si or Ti. It also shows that A1PO-11, SAPCMl and TAPOll molecular sieves have good thermal stability.
Key words:  substituted A1PO-11 molecular sieves  ratio of Si/Al  ratio of Ti/Al  crystallization temperature