Abstract
This paper systematically studied the pore structure, crystal phase, surface acidity and the chemical environment of aluminum of boron-doped γ-alumina, by impregnating boron in the period of boehmite. The nitrogen adsorption, XRD, FTIR etc. technique was used to determine the pore texture, crystallography, acid/base properties and aluminum coordination. the XRD spectrum of boria-alumina have no significant change due to the addition of boron. The specific surface area and pore volume diameter of B-Al2O3 increase significantly. The NMR spectra of B-Al2O3 shows that boron changed the chemical environment of aluminum, which caused differences in the physical and chemical properties of the surface.
Highlights
Alumina is called activated alumina due to its special surface properties, as well as its thermal stability, it has surface acidity and adjustable pore structure, so its applications in the fields of catalytic materials, drying materials, adsorption materials are very significant
There was still no characteristic peak of boron-containing species in the XRD spectrum, indicating that phosphorus it still exists in an amorphous state or the boron compound is highly dispersed in alumina
The characteristic peak intensity of γ-Al2O3 phase is reduced, indicating that its crystal phase structure is incomplete and its crystallinity is poor.The result is that the alumina surface is covered with a layer of amorphous borate, which causes the intensity of the alumina diffraction peak to decrease
Summary
Alumina is called activated alumina due to its special surface properties, as well as its thermal stability, it has surface acidity and adjustable pore structure, so its applications in the fields of catalytic materials, drying materials, adsorption materials are very significant. In the high temperature reaction fields, such as the oil hydrogenation cracking, hydrogenation and dehydrogenation, catalytic purification of automobile exhaust, γ-alumina is widely used as a catalyst support. The fundamental ways to solve these problems was to develop new type of efficient hydrogenation catalysts with high intrinsic activity and selectivity. To solve this problem, we must understand deeply of some key scientific problems, The following paper will systematically examine the effect of boron on the physical and chemical properties of activated alumina and provide a reference for further in-depth study on hydrogenation catalysts
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