Aluminum oxide carrier with macro-porous structure and preparation method

Abstract

The invention relates to an aluminum oxide carrier with a macro-porous structure. The carrier contains auxiliary agent components phosphorus and magnesium, wherein the content of the auxiliary agent components phosphorus and magnesium in the carrier is as follows in percentage by mass: 0.1 weight percent to 2.5 weight percent of P2O5 and 0.1 weight percent and 2.5 weight percent of MgO; the pore diameter distribution is 60nm to 180nm, the macro-pore ratio is 2 percent to 75 percent, the pore capacity is 0.8ml/g to 2.0ml/g and the specific surface area is 250m<2>/g to 300m<2>/g; macro-porous aluminum oxide has the characteristics of adjustable pore diameter size and capability of effectively controlling the macro-pore ratio. The aluminum oxide carrier with the macro-porous structure can be used for the fields including petrochemical industry and fine chemical engineering.

Description

technical field [0001] The invention relates to an alumina carrier and a preparation method thereof, in particular to an alumina carrier with a macroporous structure and a preparation method thereof. Background technique [0002] Due to their large pore structure, high specific surface area, and good thermal stability, macroporous oxides are widely used in heterogeneous catalysts, catalyst supports, adsorption and separation materials, chromatographic packing, electrode materials, acoustic and thermal resistance materials and other fields. [0003] There are many supports for alumina with a macroporous structure. CN03126434.4 discloses a macroporous alumina carrier, which contains alumina and also contains a halogen. Based on the total amount of the carrier, the carrier contains 95-99% by weight of alumina, based on elements, 0.1-5% by weight halogens whose acid content is less than 0.2 mmol / g. The preparation method of the macroporous alumina carrier comprises shaping an...

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Problems solved by technology

The disadvantage is that the size of the macropore (300nm or 400nm) is completely determined by the size of the polystyrene droplet introduced twice, that is, the size of the macropore depends on the size of the polystyrene droplet

The pore size cannot be adjusted by partially changing the components of the solution itself and the interaction of organic molecules in the system

Huining Li et al. (Inorganic Chemistry, 2009, 48:4421) also used the sol-gel method to introduce polymethyl methacrylate (PMMA) droplets with a single dispersed phase into the mixed solution using F127 as a template to achieve large Pore-the formation of macropores in mesoporous alumina, the disadvantage is that the size of the macropores is completely determined by the size of the secondary introduction of polymethyl methacrylate droplets, which cannot be achieved by partially changing the components of the solution system itself The adjustment of the pore size is used to realize the formation of the macropore-mesopore composite pore structure, so it is impossible to realize the controllable adjustment of the macropore-mesopore diameter. In the process of use, especially for the macromolecular catalytic process of complex components limitations

The solubility of polyvinyl alcohol templates in water is affected by the degree of polymerization, which leads to certain restrictions on their use in the preparation of super-porous alumina

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