Aluminate intercalation hydrotalcite as well as preparation method and use thereof

Abstract

The invention discloses aluminate intercalation hydrotalcite, which has a molecular formula shown as [Ma(II)1-xMb(III)x(OH)2]<x+>(A<n->)x / n.mH2O, wherein Mb(III) is Al<3+>; Ma(II) represents positivebivalent metal cations on a main body layer plate; A<n-> is intercalation anions containing Al(OH)4<->; the value of x is 0.20 to 0.33 (i.e., Ma(II):Mb(III) is (2 to 4):1). The aluminate intercalationhydrotalcite provided by the invention has the advantages that the interlayer aluminate ions can participate in the composite oxide structure building after high-temperature roasting; the macroscopical appearance maintenance is realized. The invention also discloses a preparation method of the aluminate intercalation hydrotalcite, and a use of the aluminate intercalation hydrotalcite of being used as catalysis materials and 3D printing materials.

Description

technical field [0001] The invention belongs to the field of preparation and utilization of inorganic nanometer materials, and in particular relates to a hydrotalcite intercalated with aluminate, its preparation method and application. Background technique [0002] Hydrotalcite (Layer Double Hydroxides, LDHs for short) is a typical anionic layered material, and its derivatives, such as hydrotalcites and pillared hydrotalcites, are collectively referred to as layered double hydroxides. The structural formula of layered double hydroxide: [Ma(II) 1-x Mb(III) x (OH) 2 ] x+ (A n- ) x / n mH 2 O, Ma(II) represents positive divalent metal cations on the host laminate, such as Zn 2+ , Mg 2+ , Fe 2+ , Ca 2+ 、Co 2+ 、Ni 2+ etc.; Mb(III) represents positive trivalent metal cations on the host laminate, such as Al 3+ , Fe 3+ etc.; A n- is an interlayer anion with a valence of n, such as NO 3 - , Cl - 、PO 4 3- , CO 3 2- and SO 4 2- Wait. It is a kind of layered stru...

AI Technical Summary

Problems solved by technology

First, the industrial preparation of hydrotalcite theoretically produces 1 ton of hydrotalcite will consume 100 tons of water, which is a large amount of water, and a large part of the consumed water is consumed by using water to wash the remaining ions adsorbed on the surface of hydrotalcite

Second, the hydrotalcites currently used to prepare anions such as intercalated carbonates will decompose and release gases at high temperatures, making them pulverized during heating and calcination, and cannot be used as structured catalysts or catalyst carrier materials.

The preparation of traditional spinel is mostly synthesized by the solid phase method of calcining its constituent metal oxides. Although the process is simple, the calcination requires high temperatures of 1000°C and above.

Such a calcination process also leads to sintering of the particles, resulting in a lower surface area of ​​the resulting calcined product

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