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2013-10-22 10:23:38, 281.66 K
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2013-10-22 10:24:49, 227.63 K

2Â¥2013-10-22 10:26:20
a6848265
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4Â¥2013-10-22 16:42:27
wangchao3810
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The ITQ-37 mesoporous chiral zeolite ±»ÒýƵ´Î: 147 (À´×Ô Web of Science) ÒýÓõIJο¼ÎÄÏ×: 27 [ ²é¿´ Related Records ] ÒýÖ¤¹ØÏµÍ¼ÒýÖ¤¹ØÏµÍ¼ ÕªÒª: The synthesis of crystalline molecular sieves with pore dimensions that fill the gap between microporous and mesoporous materials is a matter of fundamental and industrial interest(1-3). The preparation of zeolitic materials with extralarge pores and chiral frameworks would permit many new applications. Two important steps in this direction include the synthesis(4) of ITQ-33, a stable zeolite with 18 x 10 x 10 ring windows, and the synthesis(5) of SU-32, which has an intrinsically chiral zeolite structure and where each crystal exhibits only one handedness. Here we present a germanosilicate zeolite (ITQ-37) with extralarge 30-ring windows. Its structure was determined by combining selected area electron diffraction ( SAED) and powder X-ray diffraction (PXRD) in a charge-flipping algorithm(6). The framework follows the SrSi(2) (srs) minimal net(7) and forms two unique cavities, each of which is connected to three other cavities to form a gyroidal channel system. These cavities comprise the enantiomorphous srs net of the framework. ITQ-37 is the first chiral zeolite with one single gyroidal channel. It has the lowest framework density (10.3 T atoms per 1,000 angstrom(3)) of all existing 4-coordinated crystalline oxide frameworks, and the pore volume of the corresponding silica polymorph would be 0.38 cm(3) g(-1). |

5Â¥2013-10-22 17:13:22















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