Apr 21, 2017. Hollow silica spheres HSS with special interior spaces, high specific. Facile Synthesis of Hollow Mesoporous Silica Microspheres via. Jun 30, 2009. We report here a highly cost-effective method of preparation of mesoporous silica spheres with core shell structure using sodium silicate as. Spherical microporous silica powders with a narrow size distribution have been prepared by a precipitation technique involving the hydrolysis reaction of a silicon.
The Stöber process is a chemical process used to prepare silica SiO 2 particles of controllable. The modified process allows production of carbon spheres with smooth surfaces. allowing synthesis of spherical monodisperse silica particles of controlled. The mesoporous silica nanoparticles prepared by modified Stöber. May 9, 2011. Mesoporous Silica Hollow Spheres with Ordered Radial. A facile method for preparation of hollow mesoporous silica sphere and its.
Thus, the development of synthetic and processing methods to convert sulfur into useful chemicals remains a challenge. A research team led by Professor Ali Coskun from the Graduate School of EEWS (Energy, Environment, Water and Sustainability) at Korea Advanced Institute of Science and Technology (KAIST) has recently introduced a new approach to resolving this problem by employing elemental sulfur directly in the synthesis of microporous polymers for the process of natural-gas sweetening.
IMAGE: This image shows direct utilization of elemental sulfur in the synthesis of microporous polymers and its gas separation performance.
Using elemental sulfur and organic linkers, the research team developed a solvent and catalyst-free strategy for the synthesis of ultramicroporous benzothiazole polymers (BTAPs) in quantitative yields. BTAPs were found to be highly porous and showed exceptional physiochemical stability. In-situ chemical impregnation of sulfur within the micropores increased CO2 affinity of the sorbent, while limiting diffusion of CH4. BTAPs, as low-cost, scalable solid-sorbents, showed outstanding CO2 separation ability for flue gas, as well as for natural and landfill gas conditions.
The team noted that: "Each year, millions of tons of elemental sulfur are generated as a by-product of petroleum refining and natural-gas processing, but industries and businesses lacked good ideas for using it. Our research provides a solution: the direct utilization of elemental sulfur into the synthesis of ultramicroporous polymers that can be recycled back into an efficient and sustainable process for CO2 separation. Our novel polymeric materials offer new possibilities for the application of a little-used natural resource, sulfur, to provide a sustainable solution to challenging environmental issues."