Ke, Quanli; Khalil, Ibrahim; Smeyers, Brent; Li, Zheng; de Oliveira-Silva, Rodrigo; Sels, Bert; Sakellariou, Dimitrios; Dusselier, Michiel published their research in Angewandte Chemie, International Edition in 2021. The article was titled 《A Cooperative OSDA Blueprint for Highly Siliceous Faujasite Zeolite Catalysts with Enhanced Acidity Accessibility》.Computed Properties of C10H20O5 The article contains the following contents:
A cooperative OSDA strategy is demonstrated, leading to novel high-silica FAU zeolites with a large potential for disruptive acid catalysis. In bottom-up synthesis, the symbiosis of choline ion (Ch+) and 15-crown-5 (CE) was evidenced, in a form of full occupation of the sodalite (sod) cages with the trans Ch+ conformer, induced by the CE presence. CE itself occupied the supercages along with addnl. gauche Ch+, but in synthesis without CE, no trans was found. The cooperation, and thus the fraction of trans Ch+, was closely related to the Si/Al ratio, a key measure for FAU stability and acidity. As such, a bottom-up handle for lowering the Al-content of FAU and tuning its acid site distribution is shown. A mechanistic study demonstrated that forming sod cages with trans Ch+ is key to the nucleation of high-silica FAU zeolites. The materials showed superior performances to com. FAU zeolites and those synthesized without cooperation, in the catalytic degradation of polyethylene. In the experiment, the researchers used 1,4,7,10,13-Pentaoxacyclopentadecane(cas: 33100-27-5Computed Properties of C10H20O5)
1,4,7,10,13-Pentaoxacyclopentadecane(cas: 33100-27-5) is a member of crown ether Ligands. Crown-ethers are macrocyclic polyethers capable of forming host-guest complexes, especially with inorganic and organic cations. Crown-ethers can incorporate protonated primary amine compounds by formation of ion-dipole bonds with the oxygen atoms of the chiral selector. Crown-ethers have been widely used for the separation of several pharmaceuticals both in aqueous and non-aqueous media. Computed Properties of C10H20O5
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem