Supported zeolite catalyst for oxidation removal of dichlorobiphenyl in supercritical water

Abstract

The invention discloses a supported zeolite catalyst for oxidation removal of dichlorobiphenyl in supercritical water. Zeolite is washed and modified with AgNO3 to prepare a substance M; the substance M is modified with a mixed solution prepared from polyvinylpyrrolidone, methanol, auric chloride, rhodium chloride trihydrate, ruthenium chloride trihydrate, concentrated hydrochloric acid and sodium borohydride to prepare a substance N; the substance N is modified with a mixed solution prepared from CoCl2, CuCl2, concentrated nitric acid, urea and ammonium fluoride to prepare a substance O; the substance O is modified with a mixed solution prepared from tetra-n-butyl titanate, tetraethyl orthosilicate and acetylacetone to prepare a substance P; the substance P is modified with a mixed solution prepared from SnCl4, SrCl2 and InCl3 to prepare a substance Q; the substance Q is modified with a mixed solution prepared from NiCl2, CeCl3, NaOH, Na2CO3 and CdCl2 to prepare a substance, namely the supported zeolite catalyst for oxidation removal of dichlorobiphenyl in supercritical water.

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 loaded zeolite 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 pressure is 30-50MPa...

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 dichlorobiphenyls