Low-temperature HVOCs catalytic combustion catalyst and preparation method and application thereof

Abstract

The invention discloses a low-temperature HVOCs catalytic combustion catalyst and a preparation method and application thereof, and the catalyst comprises the following components in percentage by mass: 75-99.9% of a carrier, 0.01-10% of an active component and 0-15% of an auxiliary agent; the carrier is a composite oxide of TiO2 and one or two of Al2O3, SiO2 and ZrO2, the TiO2 accounts for 10-100% of the mass of the carrier, and the rest is one or two of Al2O3, SiO2 and ZrO2; the active component is a combination of Ru and one or two of Pt, Pd and Rh according to any ratio, and the content of Ru accounts for 5-100% of the mass of the active component; the auxiliary agent is MOx, and M is one of copper, vanadium, manganese, cerium and lanthanum. The catalyst prepared by the method has large pores, high specific surface area and high thermal conductivity, and is beneficial to heating of the catalyst and removal of heat generated in a combustion process. In industrial organic waste gas treatment, waste gas is in full contact with a catalyst, and the conversion rate is improved.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a low-temperature HVOCs catalytic combustion catalyst and its preparation method and application. Background technique [0002] Halogen-containing volatile organic compounds (Halo Volatile Organic Compounds, HVOCs) are a class of volatile organic compounds (VOCs). It can be divided into three categories: aliphatic hydrocarbon organic compounds containing fluorine, chlorine, bromine, iodine and other halogens, halogen-containing aromatic hydrocarbon organic compounds and polymeric halides. Halogen-containing aliphatic hydrocarbon organic compounds are widely used as solvents and chemical raw materials, while halogen-containing aromatic hydrocarbon pollutants mainly come from bleaching of wood pulp with halogen-based oxidants, heat treatment of halogen-containing compounds and metal recovery industry. Most of the halogen-containing volatile organic compounds are highly volatile, have good...

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Problems solved by technology

US4169862 provides a catalytic combustion catalyst for catalytic combustion of chlorinated hydrocarbons. The catalyst uses alumina, silicon oxide or a mixture of silicon oxide and aluminum oxide as a carrier, and supports 0.01 to 0.50% of platinum or palladium as an active component. It is mainly suitable for In a fluidized bed reactor; Wherein embodiment 1 mentions at inlet dichloroethane 240ppm, contact time 17s, temperature 405 ± 5 ℃ of conditions, dichloroethane conversion rate is 100%, catalyst switching frequency (Turnover frequency, TOF) is 1.274×10 -5 / s, indicating that the intrinsic activity of the catalyst is very low

[0006] At present, domestic research on HVOCs catalysts is mainly in the stage of laboratory exploration. Usually, transition metals such as chromium, iron, and copper are used as active components, or noble metals such as platinum and palladium are supported as the main active components. There are the following shortcomings in application: First, the reaction The temperature is high, and the operating temperature must be ≥ 350°C; second, the activity of catalysts with transition metals as the main component is generally low. Although the activity of chromium-containing catalysts is outstanding, it is easy to lose and deactivate during use, and chromium is a highly toxic element. It will seriously pollute the environment in the process of preparation, use and post-treatment; the third is the catalyst with precious metals such as platinum and palladium as the main component, and the loading of precious metals is high, resulting in high cost and low activity.

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