Integral dioxin removal catalyst and preparation method thereof

Abstract

The invention discloses an integral dioxin removing catalyst, which is prepared by coating a catalyst coating constituted by V2O5, WO3 and TiO2 onto honeycomb ceramic of 30-600 meshes serving as a carrier. The catalyst is a vanadium-tungsten-titanium system catalyst, and has a better anti-poisoning effect on HCl and SO2 in waste incineration tail gas; the honeycomb ceramic of 30-600 meshes is taken as the carrier, and has higher adaptability to flue gas dust due to a regular pore canal, so that industrialization and engineering minimization are realized easily, larger reaction surface area is provided, high reaction efficiency can be kept at high space velocity of flue gas, and the investment cost of the catalyst is reduced; catalyst active ingredients are loaded onto the carrier by using a coating process, so that operation is convenient, and the production efficiency is high; in the preparation process of the catalyst, an inorganic pore forming agent is added, so that void ratio is increased, the contact area between a reactant and the catalytic active ingredients is increased, and the catalyst activity is increased; the inorganic bonding agent is added, so that the bonding performance between the coating and the carrier is enhanced, and the coating firmness is improved; in the presence of the catalyst, the decomposition conversion rate of dioxin is over 95 percent at the temperature of 160-180 DEG C.

Description

technical field [0001] The invention belongs to the field of research and manufacture of tail gas treatment catalysts, and relates to an integral honeycomb catalyst for removing dioxins in waste incineration tail gas, and a preparation method thereof. Background technique [0002] With the rapid development of urbanization in various countries, more and more garbage is produced. Waste incineration is considered to be an efficient means of waste disposal due to its high degree of harmlessness, recycling and reduction, and has become one of the most important and effective technologies for waste disposal in various countries. However, the waste incineration process will inevitably produce a large amount of pollutants, such as particulate matter, HCl, NOx, heavy metals, and dioxins. These pollutants, especially dioxins, are extremely harmful to human health. Dioxin is a general term for polychlorinated diphenyl dioxins (PCDDS) and polychlorinated diphenyl furans (PCDFS), whic...

AI Technical Summary

Problems solved by technology

[0004] Patent CN1366468A discloses a TiO 2 Catalysts that disperse Pt and / or Pd in ​​medium have an excellent decomposition effect on organic halides at less than 200°C, but due to the high content of HCl in waste incineration tail gas, and the decomposition of Cl-containing organic matter will also produce Cl ions, which is easy to use Poisoning of noble metal catalysts, resulting in reduced activity or even deactivation

CN102068905A will contain catalyst component TiO 2 , V 2 o 5 、WO 3 The honeycomb monomer is impregnated with vanadium oxalate solution, then dried and calcined to obtain a catalyst for removing dioxins in flue gas, but the number of pores of the honeycomb monomer is generally small, and the reaction that can be provided The specific surface area is limited, and the amount of catalyst is large under the same space velocity condition

CN1626277A discloses a catalyst for removing dioxins in waste gas discharged from waste incinerators, by V 2 o 5 、WO 3 、MoO 3 , SiO 2 and TiO 2 Composition, but the reaction temperature of the catalyst is high (≥240°C), the energy consumption required to heat the flue gas to the reaction temperature is large, and the appearance of the catalyst is long and thin, and it is prone to blockage when the tail gas contains high dust

CN101513612A discloses a catalyst with carbon nanotubes and alumina as the carrier and manganese oxide as the active component, which has a large specific surface area and high low-temperature activity. 2 , manganese is prone to sulfur poisoning, and alumina is not as good as TiO 2 Anti-sulfur, therefore, the anti-sulfur poisoning effect of the catalyst needs to be improved

CN101559362A discloses a volcanic rock as a carrier, on which TiO 2 and V 2 o 5 Although the prepared catalyst provides a larger reaction specific surface area, has higher activity, and has better anti-sulfur effect, it is still not suitable for the application of industrial large-flow flue gas as a granular catalyst

Images