Supported ferroferric oxide catalyst for oxidizing supercritical water and removing acrylonitrile

Abstract

The invention discloses a supported ferroferric oxide catalyst for oxidizing supercritical water and removing acrylonitrile. A method for preparing the supported ferroferric oxide catalyst includes cleaning ferroferric oxide, then modifying the ferroferric oxide by the aid of AgNO3 and preparing a substance M; modifying the substance M by the aid of mixed liquid prepared from polyvinylpyrrolidone, methanol, rhodium chloride trihydrate, ruthenium chloride trihydrate, concentrated hydrochloric acid and sodium borohydride and then preparing a substance N; modifying the substance N by the aid of mixed liquid prepared from CoCl2, CdCl2, concentrated nitric acid, urea and ammonium fluoride and then preparing a substance O; modifying the substance O by the aid of mixed liquid prepared from tetra-n-butyl titanate, tetraethyl orthosilicate and acetylacetone and then preparing a substance P; modifying the substance P by the aid of mixed liquid prepared from SnCl4, SrCl2 and BiCl3 and then preparing a substance Q; modifying the substance Q by the aid of mixed liquid prepared from MgCl2, InCl3, NaOH, Na2CO3 and MnCl2 to obtain a substance which is the supported ferroferric oxide catalyst for oxidizing the supercritical water and removing the acrylonitrile.

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 acrylonitrile. 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 pressu...

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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 acrylonitrile