A Novel Framework Interweaving in Mesoporous AlPO4 and Its Function in CO2 Decomposition

Abstract

Molecular sieves are reported with isomorphous substitution by various metal ions. In this article, interweaving between tetrahedral framework of AlPO4 and the octahedral framework of CoO to produce a novel framework material is investigated; it is named as “Kankarlite” (CoO–AlPO4‐4). It is characterized by X‐ray diffraction (XRD), Fourier transform infrared, Brunauer–Emmett–Teller (BET), UV‐Vis analysis, thermogravimetric analysis (TGA), temperature programmed desorption (TPD) analysis, and transmission electron microscopy. The special feature of the catalyst is that it has two frameworks that are interweaved together to form a novel framework, which is proved by XRD and the crystal structure is drawn by VESTA software. In CoO framework, oxygen has three coordinations, which is proved by crystal structure. An excess negative charge appears on oxygen, creating an oxyanion. The TPD is also proved the oxyanion formation. This oxyanion is responsible for decomposing CO2 with high selectivity and conversion. The AlPO4 framework's function is to create mesopores in the catalyst. The TGA and UV‐Vis analyses prove the interweaving between two frameworks. The BET analysis proves that the Kankarlite has a pore size of 4 nm.