A Six-Membered Ring Molecular Sieve Achieved by a Reconstruction Route

Abstract

Zeolite molecular sieves with at least eight-membered rings are widely applied in industrial applications, while zeolite crystals with six-membered rings are normally regarded as useless products due to the occupancy of the organic templates and/or inorganic cation in the micropores that could not be removed. Herein, we showed that a novel six-membered ring molecular sieve (ZJM-9) with fully open micropores could be achieved by a reconstruction route. The mixed gas breakthrough experiments such as CH 3 OH/H 2 O, CH 4 /H 2 O, CO 2 /H 2 O, and CO/H 2 O at 25 °C showed that this molecular sieve was efficient for selective dehydration. Particularly, a lower desorption temperature (95 °C) of ZJM-9 than that (250 °C) of the commercial 3A molecular sieve might offer an opportunity for saving more energy in dehydration processes.

CaZn(HPO3)2and Ba2Zn(HPO3)3: novel alkaline-earth zincophosphites with diversified anionic frameworks

“…The increasing demand for zeolite materials with open frameworks, especially in the fields of catalysis, gas separation, ion exchange, and drug delivery, has prompted growing interest in exploring novel structures with diverse pore sizes, topologies, and chemical compositions. 1–6 Over the last few decades, numerous zeolite materials have been synthesized using both simple and complex preparative techniques, resulting in many landmark structures, including aluminates, silicates, phosphates, and germanates. 7–10 A prime example is AlPO 4 , a well-studied phosphate zeolite with a unique framework structure consisting of alternating AlO 4 and PO 4 tetrahedra.…”

Unraveling a Stable 16-Ring Aluminophosphate DNL-11 through Three-Dimensional Electron Diffraction for Atmospheric Water Harvesting

“…This is attributed to the strong interactions between water molecules and the inorganic cations embedded in the negative zeolite framework . Subsequently, cage-based AlPO MSs with a neutral framework (free of cations) and small-pore openings such as those of the LTA - and CHA -types, exhibit outstanding water adsorption capabilities. − However, moderately high-temperature conditions during regeneration are still needed. Consequently, AlPO MSs with high water adsorption capacity, robust stability, and easy regeneration are highly sought after in the field of AWH.…”