| Autor: |
Cichocka MO; Department of Materials and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden., Burton AW; Corporate Strategic Research, ExxonMobil Research & Engineering Co., 1545 Route 22 East, Annandale, New Jersey 08801, United States., Afeworki M; Corporate Strategic Research, ExxonMobil Research & Engineering Co., 1545 Route 22 East, Annandale, New Jersey 08801, United States., Mabon R; Corporate Strategic Research, ExxonMobil Research & Engineering Co., 1545 Route 22 East, Annandale, New Jersey 08801, United States., Schmitt KD; Corporate Strategic Research, ExxonMobil Research & Engineering Co., 1545 Route 22 East, Annandale, New Jersey 08801, United States., Strohmaier KG; Corporate Strategic Research, ExxonMobil Research & Engineering Co., 1545 Route 22 East, Annandale, New Jersey 08801, United States., Vroman HB; Corporate Strategic Research, ExxonMobil Research & Engineering Co., 1545 Route 22 East, Annandale, New Jersey 08801, United States., Marella MA; Corporate Strategic Research, ExxonMobil Research & Engineering Co., 1545 Route 22 East, Annandale, New Jersey 08801, United States., Weston SC; Corporate Strategic Research, ExxonMobil Research & Engineering Co., 1545 Route 22 East, Annandale, New Jersey 08801, United States., Zou X; Department of Materials and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden., Willhammar T; Department of Materials and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden. |
| Abstrakt: |
A new aluminosilicate zeolite, denoted EMM-28, has been successfully synthesized on a large scale using 1,1-(3,3-(1,3-phenylene)bis(propane-3,1-diyl))bis(1-methylpyrrolidinium) hydroxide as an organic structure directing agent (OSDA), which was scaled up to an ∼20 g scale with a yield of 77%. It crystallizes as thin plates (40-100 nm in thickness), and the corresponding powder X-ray diffraction (PXRD) pattern shows significant peak broadening which makes it insufficient for structure determination. Continuous rotation electron diffraction (cRED) data collected from 13 crystals were successfully used to solve and refine the structure of EMM-28. This illustrates that cRED data are capable of performing structure determination despite limited PXRD data quality. EMM-28 has a unique framework structure containing supercavities, >21 Å in size, connected by one-dimensional 10-ring channels. High-resolution transmission electron microscopy (HRTEM) confirmed the structure model. The structure of EMM-28 is related to several known zeolite structures with large cavities. |
