Supported ferroferric oxide catalyst used in supercritical water oxidation to remove dichlorobiphenyl

Abstract

The invention discloses a supported ferroferric oxide catalyst used in supercritical water oxidation to remove dichlorobiphenyl. A method for preparing the supported ferroferric oxide catalyst is characterized by cleaning ferroferric oxide and then modifying ferroferric oxide with AgNO3, thus preparing a substance M; modifying the substance M with mixed liquor prepared from polyvinylpyrrolidone, methanol, rhodium trichloride trihydrate, ruthenium trichloride trihydrate, concentrated hydrochloric acid and sodium borohydride, thus preparing a substance N; modifying the substance N with mixed liquor prepared from ZnCl2, PbCl2, concentrated nitric acid, urea and ammonium fluoride, thus preparing a substance O; modifying the substance O with mixed liquor prepared from tetra-n-butyl titanate, tetraethyl orthosilicate and acetylacetone, thus preparing a substance P; modifying the substance P with mixed liquor prepared from ZrCl4, CdCl2 and CeCl3, thus preparing a substance Q; and modifying the substance Q with mixed liquor prepared from SrCl2, SbCl3, NaOH, Na2CO3 and MgCl2, thus obtaining a substance, namely the supported ferroferric oxide catalyst used in supercritical water oxidation to remove dichlorobiphenyl.

Description

technical field [0001] The invention belongs to the technical field of supercritical water oxidation for refractory organic wastewater treatment, and in particular relates to a supported ferric iron tetroxide catalyst used for supercritical water oxidation to remove dichlorobiphenyl. Background technique [0002] Supercritical water oxidation is a wastewater treatment technology developed in the 1980s. It mainly uses molecular oxygen or hydrogen peroxide as an oxidant and supercritical water as a solvent to oxidize and decompose organic pollutants. In the oxidation process, due to the good solubility of supercritical water to various organic substances and oxygen, organic substances, oxidants and supercritical water form a homogeneous phase, the reaction will not be hindered by the mass transfer between the phases, and the reaction rate can be greatly increased. The reaction temperature of supercritical water oxidation treatment technology is generally 400-600°C, and the pre...

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Problems solved by technology

The catalyst commonly used in catalytic supercritical water oxidation technology is MnO 2 , CuO, TiO 2 , CeO 2 、Al 2 o 3 , Pt or a composite catalyst composed of several of them such as Cr 2 o 3 / Al 2 o 3 , CuO / A1 2 o 3 , MnO 2 / CeO 2 However, these catalysts have disadvantages such as poor stability and low catalytic activity, which limit the application and development of catalytic supercritical water oxidation technology in water treatment, so the research and preparation of new catalytic materials need to be further strengthened, especially However, there is still a lack of catalysts for supercritical water oxidation to remove dichlorobiphenyls