Ce-Mn/SAPO-34 molecular sieve catalyst and preparation method thereof

Abstract

The invention discloses a Ce-Mn / SAPO-34 molecular sieve catalyst and a preparation method thereof. The method is characterized by comprising the following steps: 1) mixing phosphoric acid with deionized water, adding pseudo-boehmite, uniformly stirring, then adding tetraethyl orthosilicate, dropwise adding morpholine to obtain a mixture A; 2) carrying out crystallization on the gel mixture A, cooling at room temperature, and separating the solid crystallized product from mother liquor, washing to be neutral, drying and roasting to obtain a catalyst carrier SAPO-34 molecular sieve; 3) adding manganese acetylacetone and cerium nitrate into acetone, fully stirring until the mixture is dissolved, adding the SAPO-34 molecular sieve obtained by the step 2), so as to obtain a mixture B, wherein n(Ce / Mn) in the mixture B is equal to 0, 0.1, 0.2, 0.3 or 0.4; 4) subjecting the mixture B obtained in the step 3) to impregnation under an ultrasonic condition and stirring to obtain a catalyst Ce-Mn / SAPO-34 precursor; 5) drying and roasting the Ce-Mn / SAPO-34 precursor obtained in the step 4) to obtain the Ce-Mn / SAPO-34 molecular sieve catalyst.

Description

technical field [0001] The present invention relates to NH 3 -SCR denitration catalyst and its preparation technology, specifically a Ce-Mn / SAPO-34 molecular sieve catalyst and its preparation method. Background technique [0002] Nitrogen oxides (NOx) are one of the air pollutants, which will cause a series of environmental problems such as acid rain, photochemical smog, ozone layer hole and fine particle pollution, and cause great harm to human health and ecological environment. [0003] Nitrogen oxides mainly come from the combustion of fossil fuels. According to statistics, 67% of the national industrial nitrogen oxides emissions come from the power and heat production and supply industries, among which the contribution of nitrogen oxides in the thermal power industry is the largest. Therefore, the power industry is my country's Key areas for controlling NOx emissions. [0004] Among many nitrogen oxide pollution control technologies, selective catalytic reduction of ni...

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Problems solved by technology

[0005] The current commercial vanadium-tungsten-titanium catalyst (V 2 o 5 -WO 3 / TiO 2 ) is its core catalyst. The optimal activation temperature of this catalyst is relatively high (300-400°C), and the denitrification system is usually arranged before the desulfurization and dust removal device. The system is installed after the desulfurization and dust removal device, the temperature of the flue gas is low, which does not meet the optimum activation temperature of the catalyst, and the flue gas needs to be reheated, which will increase energy consumption

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