Method for preparing SCR denitration catalyst at low temperatures

Abstract

The invention relates to a method for preparing an SCR denitration catalyst at low temperatures. The method includes dissolving a titanium source in absolute ethyl alcohol, regulating the pH value to2-6 by an organic acid solution, adding a rare earth metal precursor, mixing a pore-forming agent, stirring to react at 60-90 DEG C for 2-8 hours, drying after the ethyl alcohol evaporates, and roasting at 500-800 DEG C for 8-12 hours so as to obtain a molecular sieve carrier; impregnating the molecular sieve carrier by one or more of a precursor metal salt of a transition metal oxide, an acid solution or a complex for 2-8 hours, and drying at a room temperature so as to obtain an impregnated molecular sieve catalyst of the precursor metal salt, the acid solution or the complex; roasting the impregnated molecular sieve catalyst in a muffle furnace for 500-800 DEG C so as to obtain the SCR denitration catalyst. When used in catalytic cracking flue gas, the catalyst is low in SCR denitrationreaction temperature, good in activity, high in conversion rate and long in service life, thereby having promising 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] Environmental pollution caused by SOx and NOx emissions from catalytic cracking unit regeneration flue gas has attracted increasing attention. NOx is not only the main component of acid rain and photochemical smog, but also easily causes salt embrittlement and cracks in the downstream of the catalytic cracking regeneration system, resulting in damage. Safe production and sustainable development. Flue gas desulfurization technology has become increasingly mature and stable. For denitrification technology, the main FCC device flue gas deSOx technology, deNOx technology and desulfurization and denitrification integration technology, selective catalytic reduction (SCR) technology, ozone oxidation flue gas Denitrification technology, SNOx desulfurization an...

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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