Preparation and application method of VOx-MoOx/TiO2 catalyst for degrading dioxin at low temperature

Abstract

The invention relates to the technical field of building materials, and aims to provide preparation and application method of a VOx-MoOx / TiO2 catalyst for degrading dioxin at low temperature. The preparation method comprises the following steps: mixing an ammonium metavanadate solution and an ammonium molybdate solution to prepare a precursor solution, mixing the precursor solution with a nano TiO2 carrier, and stirring to obtain viscous paste; and standing, drying, crushing, sieving and calcining to obtain the powder catalyst. By adding the active component MoOx to modify the VOx / TiO2 catalyst, the initial reduction temperature of the catalyst is reduced, the activation energy required by chemical reaction is reduced, and the catalytic removal efficiency of dioxin is obviously improved. The conversion rate of VOCs is obviously higher than that of other V-Ti catalysts, and the conversion rate at the temperature of 250 DEG C reaches 90% or above. The raw materials are low in price, the preparation process is simple, batch forming can be achieved, and popularization of industrial application is facilitated.

Description

technical field [0001] The invention belongs to the technical field of flue gas treatment, and in particular relates to a low-temperature degradation dioxin VO x -MoO x / TiO 2 Catalyst preparation and application methods. Background technique [0002] Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD / Fs) are highly toxic persistent organic pollutants that are usually produced during general combustion, metallurgical-related reactions, and municipal waste incineration. Due to its strong toxicity, the discharge of PCDD / Fs in the environment must be strictly controlled. Catalytic degradation technology can completely destroy dioxins and is the most promising flue gas end control technology. [0003] Current research shows that catalysts can be divided into two categories according to their active components: noble metal catalysts and transition metal oxide catalysts. Noble metal catalysts are supported by Pd, Pt, etc. on Al 2 o 3 、TiO 2 On adsorption materials s...

AI Technical Summary

Problems solved by technology

Under relatively low temperature (150-190°C) conditions, the catalytic efficiency of these catalysts for dioxins is relatively general, for example, the degradation efficiency of V-Ti catalysts for dioxins at 160°C is relatively lower by 50% or more than that at 300°C

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