Preparation Of Al-pillared Montmorillonite And Its Application In The Catalytic Pyrolysis Of Shale Oil

In this paper, mesoporous material Al13-pillared montmorillonite with excellentproperties was successfully prepared via vacuum concentration-ultrasound way andinterlayer growth method, which overcome the disadvantages for traditional methodsin the aspect of production efficiency and properties of products.Except that, the polymeric aluminum cations (Al13) solution was concentrated to1/10of original solution by vacuum concentration method. After that, the Al13-pillaredmontmorillonite was successfully prepared via ultrasonic way. The pillaring structurehas been characterized and confirmed by XRD、 TG、 FT-IR、27Al-NMR anddesorption-adsorption analysis. The results demonstrate that the Al13-pillaredmontmorillonite prepared by concentrated Al13solution via ultrasonic processimproves the specific surface area of montmorillonite and achieves the absolutepillaring height in9.6. This mesoporous product possesses high thermal stability andnarrow pore size distribution that can effectively improve the production efficiency.The results of27Al-NMR indicate that the concentration of Al13crystals solution isincreased after concentration. And the arrangement of Al13crystal lattice betweenmontmorillonite interlayers becomes more orderly. Moreover, the pore size ofAl13-pillared montmorillonite can be controlled under the ultrasound.Besides, the Al3+were converted into hydroxy Al13polymeric cations in theinterlayers of montmorillonite by interlayer growth method, which furtheraccomplishes the Al13-pillared montmorillonite by one-step method. The results ofXRD illustrate that the interlayer spacing of Al13-pillared montmorillonite prepared byinterlayer growth method is larger than that of by traditional stirring methods. Theresults of27Al-NMR indicate that the arrangement of Al13crystal between montmorillonite interlayers is regular and Al13-pillared montmorillonite possesses thehomogeneous-distribution pores and large specific surface area. Furthermore, it ownsfacile in process, Reliable in operation and high stability in reproducibility for theinterlayer growth method in pillaring montmorillonite.Moreover, the active component (Ni, Mo and Co) has been loaded on themesoporous material by impregnation method and a series of catalysts was obtained bycalcination method. The catalysts present the outstanding catalysis performance for thehydrodesulfurization experiment of thiophene and oil shale. For example, theconversion rate of thiophene is about75%by the prepared catalysts during thecondition of300oC,1MPa hydrogen pressure and4/1hydrogen/liquid ratio. And thehydrodesulfurization experiment of oil shale demonstrates that the hydrogenationconversion rate for the branched chain unsaturated hydrocarbon on the straight chainunsaturated hydrocarbon is100%.