A 36-ring zeolite with intrinsic cylindrical mesopores.
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| Title: | A 36-ring zeolite with intrinsic cylindrical mesopores. |
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| Authors: | Sun, Jiazheng (AUTHOR), Tian, Xudong (AUTHOR), Zhang, Zhenghan (AUTHOR), Liu, Jing (AUTHOR), Han, Lei (AUTHOR), Xu, Fanrong (AUTHOR), Jiang, Han (AUTHOR), Ma, Chao (AUTHOR), Guo, Hongwei (AUTHOR), Lin, Cong (AUTHOR), Jiang, Qike (AUTHOR), Li, Guangchao (AUTHOR), Lo, Tsz Woon Benedict (AUTHOR), Song, Haitao (AUTHOR), Lin, Wei (AUTHOR), Xu, Le (AUTHOR), Li, Jian (AUTHOR) |
| Source: | Science. 4/2/2026, Vol. 392 Issue 6793, p83-86. 4p. |
| Subjects: | Zeolites, Mesopores, Separation (Technology), Catalysis, Cracking process (Petroleum industry), Aluminum silicates, Thermal stability |
| Abstract: | Stable extra-large-pore zeolites are highly desirable for catalysis and molecular separation, but most remain microporous, limiting their effectiveness for bulky substrates. Among the few extra-large-pore zeolites that exhibit mesoporosity, the pores typically form as elongated, noncircular pore apertures. We report that NJU120-6, a stable silicate zeolite with an intrinsic cylindrical mesoporous system, has the currently largest 36-ring windows with a free diameter of 25.71 angstroms by 19.12 angstroms. NJU120-6 exhibits the lowest framework density of 9.39 silicon atoms per cubic nanometer and a pore volume of 0.66 cubic centimeters per gram. It remains stable up to 1173 kelvin and can incorporate aluminum and titanium, enabling superior performance in catalytic cracking and in liquid-phase alkene oxidation of bulky molecules, respectively. Editor's summary: A high-silicate zeolite containing channels formed by a 36-membered ring exhibits high thermal stability for petroleum processing. Sun et al. used large, dicationic organic structure–directing agents to synthesize aluminosilicate zeolites with free pore dimensions of 2.6 by 1.9 nanometers. These zeolites were stable up to 900°C and, through incorporation of aluminum and titanium, could catalytically crack large hydrocarbons. —Phil Szuromi [ABSTRACT FROM AUTHOR] |
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| Database: | Psychology and Behavioral Sciences Collection |
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| Abstract: | Stable extra-large-pore zeolites are highly desirable for catalysis and molecular separation, but most remain microporous, limiting their effectiveness for bulky substrates. Among the few extra-large-pore zeolites that exhibit mesoporosity, the pores typically form as elongated, noncircular pore apertures. We report that NJU120-6, a stable silicate zeolite with an intrinsic cylindrical mesoporous system, has the currently largest 36-ring windows with a free diameter of 25.71 angstroms by 19.12 angstroms. NJU120-6 exhibits the lowest framework density of 9.39 silicon atoms per cubic nanometer and a pore volume of 0.66 cubic centimeters per gram. It remains stable up to 1173 kelvin and can incorporate aluminum and titanium, enabling superior performance in catalytic cracking and in liquid-phase alkene oxidation of bulky molecules, respectively. Editor's summary: A high-silicate zeolite containing channels formed by a 36-membered ring exhibits high thermal stability for petroleum processing. Sun et al. used large, dicationic organic structure–directing agents to synthesize aluminosilicate zeolites with free pore dimensions of 2.6 by 1.9 nanometers. These zeolites were stable up to 900°C and, through incorporation of aluminum and titanium, could catalytically crack large hydrocarbons. —Phil Szuromi [ABSTRACT FROM AUTHOR] |
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| ISSN: | 00368075 |
| DOI: | 10.1126/science.aec4882 |
