Molecular Transport and SAPO-11 Crystal Growth in an i-Pr2NH–AlPO4–H3PO4–SiO2–H2O System
✍ Scribed by Huiping Tian; Zelin Zhu; M.E.A. Bekheet; Jianbing Yuan; Chenglie Li
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 118 KB
- Volume
- 194
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
with those on physicochemical characterization of the reac-The crystal growth of SAPO-11 molecular sieve synthesized with tion mixtures are reported here. i-Pr 2 NH as a novel template from mixtures of Si, Al, and P sources were studied by XRD, MAS-NMR, IR, and AAS techniques. It EXPERIMENTAL was found that the crystallization was improved partially by the desorption of i-Pr 2 NH from the crystallite products at high temper-Materials atures. The growth on (010) face was enhanced by stepwise adding The raw materials were pseudoboemite (35% Al 2 O 3 ), aluexternal silica sol to the reaction mixtures during the synthesis minum phosphate (99% AlPO 4 ), silica sol (30% SiO 2 ), orprocess. The molecular transport and mechanism of the crystallithophosphoric acid (85% H 3 PO 4 ), iso-dipropyl amine (c.p. zation were discussed. ᭧ 1997 Academic Press grade, i-Pr 2 NH), and distilled water. The reaction mixtures