A kind of preparation method for scr denitrification catalyst under low temperature condition

Abstract

The invention belongs to a preparation method for an SCR denitration catalyst under low temperature conditions. Dissolve titanium source in absolute ethanol, adjust pH to 2-6 with organic acid solution, add rare earth metal precursor and porogen, mix and stir, react at 60-90°C for 2-8h, evaporate ethanol and dry, 500- Roast at 800°C for 8-12 hours to obtain a molecular sieve carrier; impregnate the molecular sieve carrier with one or more of transition metal oxide precursor metal salts or acid solutions or complexes, impregnate for 2-8 hours, and dry at room temperature to obtain an impregnated precursor Molecular sieve catalysts of metal salts or acid solutions or complexes; the impregnated molecular sieve catalysts are roasted in a muffle furnace at 500-800°C to obtain SCR denitration catalysts. The catalyst of the invention is used for SCR denitrification reaction temperature in catalytic cracking flue gas, has low temperature, good activity, high conversion rate, long service life and good application prospect.

Description

technical field [0001] The invention belongs to the field of heterogeneous catalyst preparation, and relates to a preparation method of a catalyst for removing nitrogen oxides at low temperature. Background technique [0002] The pollution to the environment caused by the emission of SOx and NOx from the regenerated flue gas of catalytic cracking units has been paid more and more attention. NOx is not only the main component of acid rain and photochemical smog, but also easily causes nitrite embrittlement and cracks in the downstream of the catalytic cracking regeneration system, resulting in damage. Safe production and sustainable development. The flue gas desulfurization technology has become increasingly mature and stable, and for the denitrification technology, the existing main FCC units are flue gas desulfurization technology, deNOx technology and integrated desulfurization and denitrification technology, selective catalytic reduction (SCR) technology, ozone oxidation ...

AI Technical Summary

Problems solved by technology

Patent CN106807346A discloses a low-temperature denitrification catalyst, which loads Mg\Ca\Ba\Sr\Zn\Mn\Cu oxides on γ-Al2O3, and regulates the acidic active sites of the catalyst to prevent low-temperature hydration of activated alumina to make the catalyst both waterproof Combined with the ability to increase catalytic activity, the disadvantage of this catalyst is that there is no demonstration of the relationship between acidic sites and catalytic activity, so the catalytic activity is unstable and there are disadvantages such as high reaction temperature and difficult industrial application

[0005] To sum up, at present, the denitrification aids or catalysts developed by large companies at home and abroad generally use precious metals and the denitrification efficiency is not high. Researching a SCR low-temperature catalyst has important economic value and environmental protection value

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