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The phase of AlPO-21 was hydrothermally synthesized in the reactant system of diethylamine-RB-Al_2O_3-P_2O_5-H_2O-C_2H_5OH. The crystals of AlPO-21 growing in this system crystallizes in monoclinic system,space group P2_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_4H_ 10 NH_2] +~[Al_3P_3O_ 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 AlO_4 tetrahedron and two AlO_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.
The phases of AlPO-21 was hydrothermally synthesized in the reactant system of diethylamine-RB-Al_2O_3-P_2O_5-H_2O-C_2H_5OH. The crystals of AlPO-21 growing in this system crystallizes in monoclinic system, space group P2_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_4H_10NH_2 ] + ~ [Al_3P_3O_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 AlO_4 tetrahedron and two AlO_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 th e single crystal structural analysis.