A kind of sandwich type rare earth polyacid and layered rare earth hydroxide intercalation composite material and its preparation method and application

Abstract

The invention discloses a preparation method and an application of a sandwich type rare earth polyoxometalate and layered rare-earth hydroxide intercalated composite material. The method comprises the following steps of preparing a layered rare-earth peroxide precursor, confining sandwich type rare earth polyoxometalate anions with negative charges between laminates of the layered rare-earth peroxide precursor under the action of electrostatic attraction to prepare the sandwich type rare earth polyoxometalate and layered rare-earth hydroxide intercalated composite material with overall uniformity and microcosmically adjustable chemical compositions and structure by using an ion exchange method. The prepared sandwich type rare earth polyoxometalate and layered rare-earth hydroxide intercalated composite material is applied to an extraction-oxidation desulphurization reaction by taking ionic liquid as an extracting agent and taking a hydrogen peroxide aqueous solution as an oxidizing agent. Polyoxometalate is insoluble in hydrogen peroxide under the action of confinement, so that the catalysis of a three-phase system is realized, a catalyst is separated and recycled in a centrifugation way under the system, and rare earth resources are effectively utilized; the composite material has broad industrial application prospect due to high catalytic activity and selectivity.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic composite materials, and in particular relates to a preparation method of Sandwich type rare earth polyacid and layered rare earth hydroxide intercalation composite material and its application in oil extraction and oxidation desulfurization. Background technique [0002] Layered rare earth hydroxides (LRHs) are a new type of inorganic layered functional materials with a layered structure. The main body is composed of hydroxides of rare earth metals, and its structure is similar to hydrotalcite. The general composition formula can be expressed as: [ Re 3+ 2 (OH) 5 ] + (A n- ) 1 / n ﹒ mH 2 O, Re represents the trivalent heavy rare earth cations located on the laminates, such as Tb 3+ 、Eu 3+ , Y 3+ 、Gd 3+ etc.; A n- is an interlayer anion, such as: NO 3 - , Cl - , F - 、Br - , I - and other inorganic anions; m is the number of interlayer water molecules. Eight-coordi...

AI Technical Summary

Problems solved by technology

The invention introduces the Sandwich type multi-acid anion with catalytic activity into the layered rare earth hydroxide layer, utilizes the confinement effect between the layered rare earth hydroxide layer plates, immobilizes it between the layer plates, and solves the problem of catalyst Difficult to separate and recycle, and realize the effective utilization of rare earth resources

Images