5Lok B M, Messina C A, Patton R L, et al. Crystalline silicoaluminophosphates. US Pat Appl, US 4440871. 1984.
6Parakash A M,Unnikrishnan S. Synthesis of SAPO-34: high silicon incorporation in the presence of morpholine as temperlate. J Chem Soc Faraday Trans,1994,90(15):2291～2296.
7Zibrowius B, Loffler E, Hunger M. Multinuclear MAS NMR and IR spectroscopic study of silicon incorporation into SAPO5, SAPO-31, and SAPO-34 molecular sieves. Zeolites, 1992,12(2) :167～174.
10Ashtekar S, Chilukuri S V V, Chakrabarty D K. Small-pore molecular sieves SAPO-34 and SAPO-44 with chabazite structure: A study of silicon incorporation. J Phys Chem, 1994,98:4878～4883.
