Preparation method and application of hydrotalcite-based NiMnTi catalyst

A hydrotalcite-based, catalyst technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problem of high working temperature, achieve good thermal stability, high N2 selectivity, The effect of large specific surface area
CN108993530AActive Publication Date: 2018-12-14TAIYUAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TAIYUAN UNIV OF TECH
Publication Date
2018-12-14

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Abstract

The invention discloses a preparation method and application of a hydrotalcite-based NiMnTi catalyst. The preparation method adopts nickel nitrate hexahydrate, a butyl titanate solution and a manganese nitrate solution with a mass fraction of 50% as raw materials and urea as a precipitant, synergistically exerts the advantages of Ni, Mn and Ti as the cut-in point and utilizes the preparation of NiMnTi-like hydrotalcite to effectively assemble Ni, Mn and Ti in situ. The preparation method comprises: dissolving the raw materials and a precipitant in distilled water, adding ethanol into the solution to obtain a mixed solution, carrying out reflux condensation on the mixed solution in an oil bath, carrying out cooling, suction filtration, washing, drying and grinding to obtain a NiMnTi-like hydrotalcite precursor, and calcining the NiMnTi-like hydrotalcite precursor to obtain the NiMnTi composite oxide catalyst. The NiMnTi composite oxide catalyst has good catalytic activity in the NH3-SCRreaction (with an NOx removal rate of 90% or more at 150-360 DEG C), high N2 selectivity and excellent water and sulfur resistance.
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Description

technical field

[0001] The invention relates to a preparation method and application of a hydrotalcite-based NiMnTi catalyst, belonging to the field of gas purification and denitration catalyst preparation. Background technique

[0002] Nitrogen oxides (NO x ) is one of the main pollutants in the atmospheric environment, which will cause great harm to human health and the ecological environment. With the enhancement of people's awareness of environmental protection and the increasingly stringent regulations and policies, the efficient removal and emission reduction of nitrogen oxides has been put on the agenda of environmental protection departments and production units. Selective catalytic reduction of ammonia (NH 3 -SCR) is widely used as an effective flue gas denitrification technology. However, the working temperature of the vanadium-titanium catalyst used in conjunction with it is relatively high (300-400°C), which cannot well meet the needs of working conditions such...

Claims

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