Syntheses Of ZnO/MgO-Al₂O₃ Spinel Type Composite Metal Oxides And In-Situ Assemble Of The Meso-And Microporous ZSM-5 Molecular Sieves

In order to enhance the conversion of heavy oil and prepare gasoline with high quality,investigation of new type Fulid Catalytic Cracking(FCC) catalysts and desulfurization additives with high efficiency are urgent.It is well known that the alteration of pore configuration of the FCC catalysts can solve the problem.Additionally,increase of the acid sites of FCC desulfurization additives was proved to be an effective way in this field.In present study,acid sites were introduced into the spinel type composite metal oxides and the acidity of the original FCC desulfurization additives increased dramatically.In this way,a novel FCC desulfurization additive material was successfully synthesized.In another system,mesopores were introduced into the molecular sieves with micropores and the configuration of this type FCC catalyst was changed,readily to be used as a novel FCC catalyst material.1.By dipping the MgO-Al₂O₃ spinel type composite metal oxides into ZnCl₂ solution,the Zn with acid sites was introduced into MgO-Al₂O₃ spinel type composite metal oxides and a ZnO/MgO-Al₂O₃ spinel type composite metal oxides was formed.Many factors had obvious influence on the final result.The optimum conditions were as follows:Mg/Al mol ration was 3/1, aged 24.5 h at 110℃,calcined 5 h at 900℃,ZnCl₂ solution concentration was 2.0 mol.L^-1.2.Triblock polymer surfactant can change aperture.The novel meso-and microporous ZSM-5 molecular sieves was assembled in-situ by using triblock copolymer P123 as the mesoporous template.Many factors affecting the final result.The optimum conditions are as follows:SiO₂/Al₂O₃/H₂O/TPABr/P123 mol ration was 2/0.01/150/0.4/3.4×10^-3,pH vaule was 11,stirred 0.5 h,aged 24 h at 100℃,then aged 48 h at 150℃.