The Introduction of SAPO-11

A molecular sieve SAPO-11 silicoaluminophosphate crystal structure and stability of the first synthesized. Through the burning remove template, the crystals are still icm2 provide space group of the synthetic. From the current SAPO-11 materials produce catalyst shows the high selectivity and the higher the isomerization of paraffin wax hydrogenation isomerization yields than other parts of the report.
SAPO-11 molecular sieves in isomerizationdue hydrocarbon potential applications show the special pore structure and the adjustable acidity1, 2. Aluminum (aluminum phosphate-11) the airport express line type structure molecular sieve aluminum molecular sieve family3, belongs to the department of orthogonal crystal space group of members of the icm2 provide, and integrated the 10 members of the ring aperture 3.6 x 6.3 A. Roasting remove amine (as a template), it still belongs to orthogonal crystal department, but its the symmetry of change and space group took turns Pna213, 4. The main difference between the diffraction peaks, is obviously different from the former calcination3, usually and diffraction peak disappeared in 2 θ, = 21.00 ~ 21.20 degrees and appearance of the diffraction peak in 2 θ = 21.80 ~ 21.95 degrees. SAPO-11 and also the silicoaluminophosphate family5 members are former calcining aluminum phosphate-and the same structure and X-ray diffraction map, but with different methods of synthesis calcined sample may appear different space group. In most cases, the space of Pna21, forAlPO4-11, but icm2 provide and Pna21 mixture was also observed5, 6. To our knowledge, after roasting the group stages of the space of pure icm2 provide have not yet been reported. Here, for the first time, we are to SAPO-11 molecular sieve through the burning remove template, space group of icm2 provide stable crystal structure, and it showshigher paraffin wax hydrogenation isomerization selective and higher hydroisomers than previously reported.
For the preparation of molecular sieve SAPO-11 and stability of the crystal structure, mixed precursor phosphoric acid (including 85 wt % of phosphoric acid), hydrated alumina (pseudo boehmite by aluminum sulfate containing 72% of Al2O3), silicon sol (including 26% of SiO2), DI-N-2-propanol (chemical pure) and diisopropylamine recovered (chemical pure). The typical process: 145.3 grams of phosphoric acid and 217.6 g of deionized water to join agelation autoclave under 35 ℃ to water heating, mixing 30 minutes, 99.2 g increases the hydration alumina stir 2 hours. Then, DI-N-2-propanol 14.17 g and 21.25 g of diisopropylamine recovered to mix evenly, and then add in the above gel reaction kettle, mixing 2 hours. Finally, increased 66.62 grams of silicon sol, thoroughly stir 2 hours, so the reaction mixture preparation. We found that gelation temperature is very important, the literature and have not mentioned. A sealed inside a part of the reaction mixtures stainless steel crystallization reaction axe in 160 ℃ heating 24 hours
Their stress. Crystal products, and then filter, washing and drying 100 ~ 110 ℃ for the night to get the molecular sieve powder products. As part of the raw material.Powder detected by X-ray diffraction (instrument is brooke 5005 model), the result of the data (see table 1) from reference5 arecoincident. That said, the molecular sieve AEL structure with synthesis of molecular sieve.



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