Preparation And Applications Of Magenetically Core-shell Structure Carbon Based Solid Sulfonic Acid

Along with the enhancement of people’s environmental awareness, green production of chemical industry were advocated. Solid acid as a kind of environmental friendly catalyst is more and more favored by scientists. In recent years, multi-functional complex carbon-based solid acid has attracted much attention due to its unique properties, both in domestic and abroad. But the reported complex carbon-based solid acid has disadvantages of small specific surface area, low acidity, and poor stability etc. To overcome these disadvantages, these paper aims at synthesis closely combined multiple-carbon source assembled monolayers with microemulsion theory and the static self-assembly multilayer. Then the magnetic Fe3O4-core and reticular oxidized asphalt-shell porous carbon membrane material precursor was obtained via oxodized asphalt carbon and situ copolymerization. Activated and sulfonated magnetic carbon-based solid acid was characterized by IR, VSM, TEM, TG, XRD, XPS techniques. The morphology of magnetic core-shell solid acid was tested by TEM, IR spectra of SO3H-bearing magnetic core-shell solid acid exhibits two additional bands at1038and1209cm-1, which is associated with a O=S=O bond.The S2p3indicating the168ev peaks can be attributed to the SO3groups, characteristic peaks of the quality of the relative content of1.03%, indicating the successful grafting of SO3H groups onto magnetic core-shell. Both XPS and IR results confirmed that sulfonic groups had been successfully functionalized on the surface of the magnetic core-shell. The catalyst has superparamagnetic measured by VSM. The catalytic performance of the solid acid was characterized by acetal (ketone), esterification reaction, with benzaldehyde aniline condensed derivatives and amide naphthol as probe. Results show that the magnetic carbon based solid acid has a high acidity, good stability, larger specific surface area, good recycling. It showed good catalytic activity in the probe reaction, and rapidly separation from the reaction system in additional magnetic field conditions. This magnetic carbon based solid acid could simplify the operation steps, reduce the production cost, so that it will have a broad application prospect in acid catalytic chemical production industry.