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Synthesis, Structure and Adsorption of AIPO‐21 Prepared by Cotemplate Method
Author(s) -
Zhang Lei,
Cheng XiaoWei,
Long YingCai
Publication year - 2003
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20030211217
Subject(s) - chemistry , monoclinic crystal system , diethylamine , crystallography , adsorption , molecule , crystal structure , powder diffraction , hexane , methanol , organic chemistry
Abstract The phase of AIPO‐21 was hydrothermally synthesized in the reactant system of diethylamine‐RB‐Al 2 O 3 ‐O 5 ‐H 2 O‐C 2 H 5 OH. The crystals of AIPO‐21 growing in this system crystallizes in monoclinic system, space group P 2 1 /n with a = 0.8542(4) nm, b = 1.7635(8) nm, c = 0.9082(4) nm, β = 108.234(5)°, V = 1.2993(10) nm 3 , Z = 4, and the formula is [C 4 H 10 NH 2 ] + = [Al 3 P 3 O 12 (OH)] − . The structure is resolved by the direct method and refined to R 1 = 0.0767 and wR 2 = 0.1627 based on 1719 observed reflections with I > 2.0σ ( I ). An asymmetric unit consists of three PO 4 tetrahedra, one AIO 4 tetrahedron and two AIO 5 trigonal bipyramids. The framework is composed of 3‐D uniform channels along [100], [001] and [101] with eight‐membered oxygen ring windows. The powder sample of the MS was investigated with powder XRD, TG/DTG/DTA and the adsorption of water, methanol, n‐hexane, ethylene, and ethane. The specific property for sieving molecules was observed on the adsorption isotherms, and proves the result of the single crystal structural analysis.