Supported foam iron catalyst used for dimethylformamide removing by supercritical water oxidation

Abstract

The invention discloses a supported foam iron catalyst used for dimethylformamide removing by supercritical water oxidation. Foam iron is cleaned and then modified by AgNO3 to prepare a substance M; the substance M is modified by a mixed liquor to prepare a substance N, wherein the mixed liquor is prepared from polyvinylpyrrolidone, methyl alcohol, trihydrate rhodium chloride, concentrated hydrochloric acid and sodium borohydride; the substance N is modified by a mixed liquor to prepare a substance O, wherein the mixed liquor is prepared from MgC12, ZnC12, concentrated nitric acid, urea and ammonium fluoride; the substance O is modified by a mixed liquor to prepare a substance P, wherein the mixed liquor is prepared from tetra-n-butyl titanate, tetraethyl orthosilicate and acetylacetone; the substance P is modified by a mixed liquor by a mixed liquor to prepare a substance Q, wherein the mixed liquor is prepared from ZrC14, PbC12 and CeC13; and the substance Q is modified by a mixed liquor to prepare the supported foam iron catalyst used for dimethylformamide removing by supercritical water oxidation, wherein the mixed liquor is prepared from NiC12, AlC13, NaOH, Na2CO3 and CoC12.

Description

technical field [0001] The invention belongs to the technical field of supercritical water oxidation for refractory organic wastewater treatment, and particularly relates to a supported foam iron catalyst used for supercritical water oxidation to remove dimethylformamide. 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 pressure is 30-...

AI Technical Summary

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 dimethylformamide